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AZ 204 > AZ 204 > Flashcards

AZ 204 Flashcards

1
Q

Event Grid: What is a topic?

A

Provides an endpoint where the source sends events

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2
Q

Event Grid: HTTP webhooks event handler retry until what?

A

The handler returns a http 200 code

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3
Q

Event Grid: Which data type are events sent as?

A

Events are sent in an array which can have several event objects. Each event object is limited to 1 MB. Larger messages result in a 413 payload too large

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4
Q

Event Grid: How are operations charged?

A

In 64 kb increments. So for example 130kb is charged as 3 separate events (64+64+64)

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5
Q

Event Grid: Which 4 properties are required?

A

Subject, EventType, EventTime, Id

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5
Q

Event Grid: Which property in the schema can be used to route/filter?

A

There are three options for filtering: Event types, Subject begins with or ends with and advanced fields and operators

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6
Q

Event Grid: Does Event Grid guarantee order for delivery?

A

No, subscribers may recieve them out of order.

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7
Q

Event Grid: Which two retry configurations exist?

A

Maximum number of attempts (1-30) or Event time-to-live (1-1440 minutes)

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8
Q

Event Grid: You want to allow a service to send events to Event Grid Topics. Which RBAC role do you assign?

1) Event Grid Subscription Reader
2) Event Grid Subscription Contributor
3) Event Grid Contributor
4) Event Grid Data Sender

A

4) Lets you send events to Event Grid topics.

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9
Q

Event Grid: You want to allow a service to create and manage Event Grid resources. Which RBAC role do you assign?

1) Event Grid Subscription Reader
2) Event Grid Subscription Contributor
3) Event Grid Contributor
4) Event Grid Data Sender

A

3) Lets you create and manage Event Grid resources.

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10
Q

Event Grid: What is the az cli command to create a new topic?

A

az eventgrid topic create –name $myTopicName \
–location $myLocation \
–resource-group az204-evgrid-rg

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11
Q

Event Hub: What is Azure Event Hubs?

A

A big data streaming platform and event ingestion service. It can recieive and process millions of events per second

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12
Q

Event Hub: What is the primary interfrace for developers interacting with Event Hubs?

A

Develops interact through an Event Hubs Client

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13
Q

Event Hub: What is a an Event Hubs producer

A

A special type of client that serves a source of telemetry data. Examples can be mobile device applications, a website etc.

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14
Q

Event Hub: What is a consumer group?

A

A consumer group enables multiple consuming applications to have their own view of the event stream and read data at their own pace. It is recommend to only have 1 consumer group per partition though, since multiple readers on the same partition will result in duplicate events.

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15
Q

Event Hub: How does the architecture of Event Hub ensure that it never gets “too full”

A

First of all Event Hub uses a partitioned consumer model which is key to scaling. Secondly as the data ages off it is deleted by using the configurable retention period.

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16
Q

Event Hub: Which unit of measure is used to control traffic?

A

Traffic is controlled though Throughput units. A single throughput unit allows 1MB per second OR 1000 events per second of ingress. For egress the amount is twice of that.

You can configure between 1-20 throughput unit but can raise a support ticket to increase further

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17
Q

Event Hub: What happens if you use more throughput than our configured units?

A

Usage beyond the purchased throughput is throttled

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18
Q

Event Hub: What does checkpointing mean?

A

Checkingpointing is a process by which an event processor marks or commits the position of the latest read. This makes the system more resilient since other processors can take over in case of failure

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19
Q

Event Hub: Which mechanisms are supported to Authenticate and Authorize?

A

Supports both Azure AD and Shard Access Signatures (SAS)

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20
Q

Event Hub: Which RBAC roles should be assigned to a service that needs to send data to the Event Hub?

A

Azure Event Hubs Data Sender gives the role send access to Event Hub resources.

The other 2 in-built roles are Data Owner and Data Reciever.

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21
Q

Event Hub: Under which namespace do the .NET clients exist?

A

Azure.Messaging.EventHubs

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22
Q

Event Hub: Which .NET/Java client is used to consume data?

A

EventHubConsumerClient

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23
Q

Event Hub: What is a partition

A

An ordered sequence of events held in an Event Hub

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24
Q

Messaging: Which two types of queue mechansims do Azure support

A

Service Bus queues and Storage queues

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25
Q

Storage Queue: How large can storage queue messages be?

A

Up to 64kb in size

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26
Q

Messaging: Which queue solution should be selected if you must store over 80 gb of messages in a queue?

A

The Storage Queue. In the storage queue the limit of the queue is the same as the whole storage account

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27
Q

Messaging: You want service side logs of all transactions against your queue. Which solution do you choose?

A

The Storage Queue.

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28
Q

Messaging: You want to implement a checkpoint mechanism for your solution. Which solution do you choose?

A

The Storage Queue is ideal for logging progress

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29
Q

Messaging: Which solution supports deduplication of messages?

A

The service bus queue

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30
Q

Messaging: You want to provide a guaranteed FIFO delivery of your message. Which solution do you pick?

A

The service bus queue

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31
Q

Messaging: Your messages might be up to 256 kb in size. Which solution do your choose?

A

The service bus queue. Messages can exceed 64kb but likely wont approach the 256kb limit. In premium tier messages can be up to 100Mb.

The storage queue is limited to 64kb per message.

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32
Q

Messaging: Name some features that the Service Bus Queue supports which the Azure Storage Queue does not.

A

Pub/sub models, deduplication, FIFO delivery, larger messages and can deliver in parallel long-running streams.

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33
Q

Messaging: Which .NET namespace do you find client libraries in?

A

Azure.Messaging.ServiceBus

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34
Q

Messaging: In what way does a messaging architecture affect the required load levels of your applications (think avg load vs peak load)

A

A benefit of using queues and messages is that the application only has to deal with average load, because you have a buffer system

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35
Q

Service Bus: Explain the difference between “Receive and delete “ or “Peek lock” receive modes

A

Receive and delete: Deletes the message on receive. This makes it less tolerant to failures as a crash may result in a message not being processed.

Peak lock: The process becomes two-stage. When the message is receives it is marked as locked and then returned. When the processing is finished it marks it as completed. The lock has an associated timeout which can “unlock” the message again if it hasn’t been completed.

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36
Q

Messaging: What is the different between a queue and topics/subscriptions?

A

Topics/Subscription allow for a 1:N model where a topic can have many subscribers.

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37
Q

Service Bus: Which two sets of properties exist?

A

1) Broker defined properties:

Predefined by the system and default meta data.

2) User defined properties
Collection of key-value pairs that can be controlled by the application

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38
Q

Service Bus: Give some example of broker defined properties:

A

To, ReployTo, ReplyToSessionId, MessageId, CorrelationId, SessionId

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39
Q

Service Bus: Which advanced feature allows routing inside of a service bus namespace?

A

Routing can be realized using auto-forward chaining. If you want to use routing across namespaces you can use LogicApps.

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40
Q

Service Bus: Which advanced feature allows routing inside of a service bus namespace?

A

Routing can be realized using auto-forward chaining. If you want to use routing across namespaces you can use LogicApps.

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41
Q

Service Bus: Payload is always sent as a string. True / False?

A

False. Payload is binary data and information about how to deserialize it can be sent in the ContentType property.

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42
Q

Service Bus: How to create a queue throught the az cli?

A

First you have to create a namespace and then the queue

az servicebus namespace create –resource-group $RG –name $NAME –location $LOC

az servicebus queue create –resource-group $RG –namespace-name $NAME –name $MYQ

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43
Q

Storage Queue: How is access to a Storage Queue controlled?

A

All access goes thourgh the Storag Account

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44
Q

Storage Queue: How to make messages automatically expire?

A

You can configure a maximum time-to-live which can be any positive number or -1 indicating the message doesn’t expire.

The default value is 7 days

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45
Q

Azure Service Bus: How to create a FIFO guarantee?

A

To create a first in- first out guarantee you have to use Sessions. Message sessions enable joint and ordered handling of unbounded sequences of related messages

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46
Q

VM: How long can custom script extensions run for?

A

90 minutes

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47
Q

VM: How many VMs can a scaleset handle?

A

A scaleset can handle up to 1000 VMs

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48
Q

VM: What is the default encryption mode for disks?

A

They are encrypted at rest by default with a managed key. It is possible to change to a customer managed key.

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49
Q

VM: What is an availability zone a combination of?

A

An AZ is a combination of a Fault Domain and an Update Domain

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50
Q

VM: Which two types of disks exists?

A

The regular disk is where the OS etc. is stored. These are recommended to be SSDs. Additional data can be stored on Data disks

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51
Q

VM: Explain what an availability set is

A

A logical grouping of VMs that help Azure understand how your application is built to provide for redundancy and availability

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52
Q

VM: Explain what a Fault Domain is

A

To help protect the application against hardware failures the VMs can be placed in different fault domains. It can be pictured as a rack in a data center. (although not 1:1 picture)

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53
Q

VM: Explain what an Update Domain is

A

Helps ensure that a particular VM can be updated. Logical grouping of the underlying hardware

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54
Q

VM: What is the different between Managed and Unmanaged disks

A

Umananaged disks reside in your storage account and hold the disks (VHD files). It cannot be guaranteed that availability sets are on different fault domains. Unmanaged disks always inherit the IOPS limits of the storage account.

Managed disks are not limited by storage accounts and managed by azure.

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55
Q

VM: Explain what a Scale Set is

A

A scale set is a group of load-balanced VMs. They can hold up to 1000 VMs.. Scalesets are ideal for unpredictable workloads. The VMs in the scaleset are identically configured.

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56
Q

VM: Explain when to use an availability set vs scale set

A

Availability sets are used for smaller setups with predictable load. Scale sets are used for unpredictable loads and can hold up to 1000 VMs

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57
Q

VM: A fixed sized disk is required to support encryption. True / False?

A

True

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58
Q

VM: Where can Custom Script Extensions be located and what are they?

A

Scripts for post-deployment configurations. Can be located anywhere as long as the VM can route to it .. (Github, Blob Storage etc)

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59
Q

VM: How to migrate an encrypted disk?

A

In order to migrate an encrypted disk we must first turn off encryption, migrate and then turn on encryption again

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60
Q

VM: How to encrypt a disk onpremise?

A

You can encrypt it on-premise with bitlocker and then upload the Virtual Hard Diive to Azure Storage Account

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61
Q

ARM: Are ARM templates imperative or declarative?

A

They are declarative. You declare what you want to have

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62
Q

ARM: Are templates idempotent? True/False

A

True

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63
Q

ARM: Which of the following are required?
Parameters
$schema
Variables
resources
User-defined functions
contentVersion
Resources
Outputs

A

$schema, resources and contentVersion

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64
Q

ARM: Which resource type is used for storing an ARM template for later use?

A

A template spec.

Supports versioniong

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65
Q

ARM: You deployed an ARM template with multiple references and lists. Your configuration threw a not found configuration even though you had a condition to ensure that it is only ran if the reference exists. How come?

A

“References” and “lists” are always evaluated even if the condition is false. To work around this they must be wrapped in an if-condition

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66
Q

ARM: Explain the difference between “complete” and “incremental” deployment modes

A

Complete will delete other resources in the RG so the template matches the RG exactly.

Incremental: Will leave existing resources be.

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67
Q

ARM: How to extend templates with logic?

A

ARM templates can use expressions that extend JSON. In-built Resource Manager Functions such as “contains”, “lessOrEquals” etc can be used.

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68
Q

ARM: How to create an ARM template through the az cli?

A

az deployment group create

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69
Q

ACR: How is Azure Container Registry billed?

A

By the second

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70
Q

ACR: Which min. tier is recommended for production

A

Standard tier. Provides more storage and throughput

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71
Q

ACR: Which new features does the premium tier unlock?

A

Geo-replication, private endpoint, image tag signing etc

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72
Q

ACR: What is ACR tasks?

A

Enables automated image builds from source code changes or a container’s base images.. Can be used in CI/CD pipelines by using the az acr build command for example

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73
Q

ACI: What is Azure Container Instances

A

A service that allows you to run containers in azure. The simplest and fastest way to run containers.

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74
Q

ACI: Can both run windows and linux containers? True/False

A

True

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75
Q

ACI: In what scenarios is AKS (Azure Kubernetes) recommended over ACI?

A

If you need full orchestration with features like service discovery, automatic scaling etc. AKS is recommended

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76
Q

ACI: How can other application communicate with a container instance in ACI?

A

Containers are giving a public IP and FQDN

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77
Q

ACI: What is a container group?

A

A way to group containers. These containers are scheduled on the same host machine. They share lifecycle, network, storage etc.

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78
Q

ACI: What are some ways to deploy an ACI?

A

ACI can be deployed with ARM templates or YML files

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79
Q

ACI: You notice in your logs that your container keeps restarting. How can that be?

A

You configured a “OnFailure” retry policy. Your container has a bug that makes it crash. Your retry policy makes the container retry again and again.

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80
Q

ACI: You want your container to run at most once. Which retry policy do you select?

A

“Never”. The container is never restarted so containers run at most once

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81
Q

ACI: Which restart policies exist?

A

Always - always restarted
Never - Runs at most once
OnFailure - Restarts on non-zero exit codes. Runs at least once

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82
Q

ACI: Can ENV variables be exposed to containers? True/False

A

True

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83
Q

App Service: How many app services can exist in a free app service plan?

A

10

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84
Q

App Service: What is the ac cli command to package and deploy a web app?

A

az webapp up

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85
Q

App Service: Which unit is use to denote the performance of an app service plan across different metrics?

A

ACU (Azure Compute Unit)

An ACU of 200 is expected to be roughly double as powerful as 100 ACU

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86
Q

App Service: Which tier supports load balancing?

A

Standard plans and up

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87
Q

App Service: For which kind of service is the consumption tier available?

A

Azure Functions

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88
Q

App Service: You have strict organizational requirements around network and compute. Which plan do you select?

A

Isolated. The code will run on your own dedicated VMs and provide Network + Compute isolation

Another alternative is the Service Environment (ASE) to run it directly in your VNET

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89
Q

App Service: You need compute isolation for our services. Do you select the “dedicated plan” or the “isolated” plan?

A

Dedicated plan is sufficient as it provides compute isolation.

Isolated provides compute isolation + network isolation

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90
Q

App Service: Which plan is used to run app services directly in your VNET?

A

To run app services directly in a VNET you must use Service Environment (ASE)

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91
Q

App Service: How can inbound network be controlled?

A

App-assigned address, access restrictions, service endpoints or private endpoints

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92
Q

App Service: How can outbound network be controlled?

A

VNET Integration, hybrid connection or gateway

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93
Q

App Service: How to run an app service with a runtime that is not supported out of the box?

A

Your can deploy your code with a custom container that holds your runtime

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94
Q

App Service: How can green/blue deployment be achieved in app services?

A

You can use deployment slots to first deploy your production build to a staging environment and swap it over the production when you have confirmed that it works

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95
Q

App Service: Which settings are configured in the “general settings” tab?

A

Runtime, major version, platform settings, debugging etc

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96
Q

App Service: How to add custom storage for containerized apps?

A

You can add custom storage by mounting storage from an azure storage account

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97
Q

App Service: Web server logging is supported on both windows/linux?

A

No, only on windows.

Linux only have application logging and deployment logging.

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98
Q

App Service: You want to see the latest logs of a webapp thorugh the az cli. How do you do it?

A

az webapp log tail –name appname –resource-group myResourceGroup

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99
Q

App Service: What is one way to implement feature management?

A

You can use App Configuration which provides modern features like feature flags

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100
Q

App Service: What is the advantage to use app configuration over application settings?

A

Changing application settings require restarting the app service. App Configuration can be changed without service interruption

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101
Q

App Service: Which two parts make of a feature flag?

A

A name and a list of one or more filters to evaluate the feature’s state

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102
Q

App Service: Is autoscaling horizontal or vertical?

A

Autoscaling is horizontal and means we scale in/out

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103
Q

App Service: When should autoscaling be enabled?

A

When your application can’t easily predict the worklaod in advance

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104
Q

App Service: Scaling can be based on two different options. Which?

A

Scale based on a metric or according to a schedule

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105
Q

App Service: Explain what an autoscale cooldown period is

A

A cooldown period is an interval where new scaling actions wont be triggered. This is to allow the system to stabilized between autoscale events. The minimum cooldown periods is five minutes.

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106
Q

App Service: You have multiple scale out configurations configured. Only one of them evaluates to true. Does your service trigger scale?

A

Yes, only one condition needs to be met on scale-out

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107
Q

App Service: You have multiple scale in configurations configured. Only one of them evaluates to true. Does your service trigger scale?

A

No, all scale-in rules must be met in order to scale-in

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108
Q

App Service: Explain what “flapping” situations mean in terms of autoscaling

A

When scale-in and scale-out conditions continually go back and forth you can end up triggering scale out and scale in again and again which is not ideal. To avoid this there should be a margin between scale-out and scale-in conditions. For example +1 on CPU >= 80% and -1 on <= 60% CPU

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109
Q

App Service: You want to figure out how your application has auto-scaled over the last couple of days. How can you see it?

A

The Activity Log logs autoscaling events or other conditions such as missing metrics available etc

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110
Q

App Service: You want to perform a slot swap but want to ensure that your new service is read to take traffic

A

You can specify a warm-up configuration in applicationInitialization.

This lets your run warm up code before the taget slot is swapped

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111
Q

App Service: What default % traffic are new slots given?

A

0%

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112
Q

App Service: You want some of your users to try out a new feature. How can this be done?

A

You can do this with app configuration’s feature management or you can direct a % of your traffic to different app service slots

113
Q

App Service: Are these settings swapped? App settings, WebJobs content, service endpoints, public certificates?

A

Yes. App settings however can be configured individually to be sticky to a specific slot

114
Q

App Service: Are these settings swapped? Scale settings, IP restrictions, WebJob schedulers, Custom domain names

A

No

115
Q

Cosmos: What is the SLA for read and write?

A

99,999%

116
Q

Cosmos: How is Cosmos DB billed?

A

Billed by RU’s (Request Units)

117
Q

Cosmos: What is Cosmos DB?

A

Globally distributed database system that allows you to read and write data from local replicates and make it sync to other regions

118
Q

Cosmos: Which unit is at the top of the resource hierachy?

A

The Azure Cosmos DB Account.

Contains a unique DNS

119
Q

Cosmos: Which unit is the unit of scale in a Cosmos DB resource hirarchy?

A

The Azure Cosmos DB Container. You can virtually have unlimited provisioned throughput RUs and storage on a container

120
Q

Cosmos: A container can be realized in a number of ways. Explain what this means

A

Cosmos DB supports multiple APIs such as a graph, table, nosql etc.. containers can thus be realized as a collection, table, graph etc.

121
Q

Cosmos: An item can be realized in a number of ways. Explain what this means

A

If your container is a graph API then your items will be nodes and edges .. If it’s a relational DB then your items will be rows

122
Q

Cosmos: Which resource is anagolous to a namespace?

A

A database is also called a namespace in Cosmos

123
Q

Cosmos: Which resource is the unit of management for a set of containers?

A

Database manages a set of containers

124
Q

Cosmos: Explain the resource hirearcy

A

Database Account -> Database -> Containers -> Items

125
Q

Cosmos: On which resource is throughput and storage provisioned?

A

On the container level

126
Q

Cosmos: Which two throughput modes exist?

A

Dedicated throughput: Exclusively reserved for that container.

Shared throughput: These contains share the throughput with other containers in the same database.

127
Q

Cosmos: Name the 5 consistency levels

A

Strong, Bounded staleness, session, consistent prefix and eventual

(SBSCE) acronym

128
Q

Cosmos: What are the tradeoffs of selecting a strong consistency level?

A

You ensure that all clients always read the latest write. You will gain lower availability and lower throughput and higher latency

129
Q

Cosmos: What are the tradeoffs of selecting eventual consistency?

A

Reads may not always be up to date but you will experience the highest availability, lowest latency and highest throughput

130
Q

Cosmos: Explain what a lag-level is in terms of consistency

A

The time between a write and all clients will read the newest value. In strong consistency the lag-level is effectively 0

131
Q

Cosmos: Bounded staleness can be configured in what two ways?

A

The number of versions (K) of the item
The time interval (T) reads might lag behind write

132
Q

Cosmos: What is the cost to perform a read of 1KB item?

A

1RU

133
Q

Cosmos. What is the cost to perform a read of a 6KB item?

A

6RU (1 per 1kb)

134
Q

Cosmos: You have many containers in your database. You have been tasked to ensure that container 1 is always ensured to have adequate throughput. How can you do this?

A

You can select the dedicated provision mode. This means the provisioned RUs are dedicated to a single container

135
Q

Cosmos: What is the serverless mode?

A

In this mode you don provision any throughputs. You pay for what you use at the end of your billing period

136
Q

Cosmos: What is provisioned throughput mode?

A

You provision throughput on a per-second basis in increments of 100RUs per second.

137
Q

Cosmos: At what granularity levels can provisioned throughput mode be configured?

A

Database or container level

138
Q

Cosmos: What is Autoscale mode?

A

You can automatically and instantly scale RUs of your database based on usage. Well-suited for unpredictable traffic patterns while requiring SLA

139
Q

Cosmos: What are the differences between physical- and logical partitions?

A

Physical partitions are an internal implementation and not something you need to worry about. You can control the logical partiations by selecting good partitions keys

140
Q

Cosmos: What is the total data storage limitation for each physical partition?

A

Up to 50GB

141
Q

Cosmos: What is the total throughput limitation for each physical partition?

A

Up to 10K RUs/second

142
Q

Cosmos: What is the scope of transactions?

A

A logical partition defines the scope of database transactions.

143
Q

Cosmos: Do all items in a logical partition share partition key?

A

Yes

144
Q

Cosmos: What is a “hot” partition?

A

Since traffic is distributed evenly among physical partitions you can end up with lots of traffic being routed to the same partitions if you havent selected a good partition key?

145
Q

Cosmos: You noticed that you often meet rate-limiting and higher costs in your Cosmos DB container. Why can that be?

A

You didn’t select a good partition key and have “hot” partitions

146
Q

Cosmos: Which two components make up a partition key?

A

A partition key path and partition value

147
Q

Cosmos: Which characteristics make up a good partition key?

A

Value does not change, high cardinality, spread data storage

148
Q

Cosmos: Which trick can be used for better performance in read-heavy containers?

A

Partition keys that appear in your filter queries can be routed more efficiently to the relevant physical partition

149
Q

Cosmos: What is a synthetic partition key?

A

You can add a random suffix or a pre-calculated suffix such as a composite key or a hash

150
Q

Cosmos: Which namespaces are the .NET cosmos clients in?

A

Microsoft.Azure.Cosmos

151
Q

Cosmos: When defining a stored procedure input parameters are always send as what type of the stored data?

A

String

152
Q

Cosmos: Which trigger can be used to validate properties of an item?

A

Pre-trigger

153
Q

Cosmos: How can you create a notification feed?

A

You can create an azure function that has a cosmos db trigger. Notice that it is not triggered on delete

154
Q

Cosmos: Which has lower latency. Azure Storage Tables or Cosmos?

A

Cosmos

155
Q

Cosmos: Which client object can be used to check if there are more items to process?

A

You can use a FeedIterator and check the HasMoreResults property

156
Q

Storage: Which three access tiers exist and which is default?

A

Hot, Cool, Arhived.

Hot is default

157
Q

Storage: How long must items in the cool access tier be kept?

A

At least 30 days

158
Q

Storage: Explain the archived access tier

A

Content is stored offline. Can take several hours to retrieve and is stored for at least 180 days.

159
Q

Storage: How can a blob be rehydrated from the archived access tier?

A

Copy to online tier or change access tier (can set x-ms-hydrate-priority header to prio. over others)

160
Q

Storage: Max account size?

A

5PB

161
Q

Storage: IO throughput limit?

A

20.000/s

162
Q

Storage: What are the three blob types?

A

Block blob (max 4.7tb), append blob (max 190gb), page blob(max 8tb)

163
Q

Storage: What can append blobs be used for?

A

Ideal for append operations such as logging data

164
Q

Storage: What can page blobs be used for?

A

Store random access files up to 8TB such a a virtual hard drive

165
Q

Storage: Which encryption method encrypts data at rest?

A

256-bit AES

166
Q

Storage: Explain LRS

A

Locally redundant storage. Copies data synchronously three times within a physical location

167
Q

Storage: Explain ZRS

A

Copies data across three azure availability zones in the primary region

168
Q

Storage: Explain GRS

A

Copes data three times within a single physical location and then copies the data to a single physical location in the secondary region

169
Q

Storage: Explain GZRS

A

Crazy availability requirements. Copies across three AZs and then copies to a secondary region where it copies it three times within that datacenter (LRS in second region, and ZRS in primary region)

170
Q

Storage: What is a lifecycle management policy?

A

Collection of rules in JSON format that tell when to move content between access tiers

171
Q

Storage: Can you copy an archived blob to an online destination in antother storage account?

A

No

172
Q

Storage: What is a change feed?

A

A change feed is a transactional audit/log changes to blobs. The changes are recorded in a few minutes

173
Q

Storage: What are some ways to react to blob storage changes?

A

Most commonly you use blob storage events propagated through azure event grids, but in some cases where you don’t need to react immediately the change feed is also an option

174
Q

Storage: What is a SAS token?

A

A URI that grants restricted access rights to azure storage resources

175
Q

Storage: How can you delegate access to a client so they can access some resources?

A

Generate a SAS token for the client

176
Q

Storage: Which service does a User delegation SAS provide access to?

A

User delegation SAS only works for blob storage

177
Q

Storage: Explain what a Service SAS provides access to

A

A Service SAS provides access to a storage service such as blob storage, queue storage, table storage or azure files

178
Q

Storage: Your users need to read/write their own data directly to blob. How can you enable users to only write their own da ta?

A

Generate a SAS token that provides restricted access to the user’s data

179
Q

Storage: Which SAS token type does Microsoft recommend for superior security?

A

The User delegation SAS which is secured with Azure AD and applies to Blob storage only

180
Q

Storage: Explain what an Account SAS does

A

A SAS token secured with the storage account key. Can delegate access to resources in or more storage service. All features of Service/User delegation token are also available here

181
Q

Storage: What does signed permissions (sp) tell in a SAS token?

A

Signed permissions tell if the token can read (r) or write (w)

182
Q

Storage: What does signed resources (sr) tell in a SAS token?

A

Signed ressources tell which resources the token has permissions for. For example b for blob and c for container

183
Q

Storage: What are stored access policies?

A

An extra set of policies for controlling the parameters such as start time / expiry time when generating SAS tokens.

184
Q

Redis: What is the command for storing a key/value with expiration time in Redis?

A

SETEX: SETEX mykey 1800 “somevalue”

185
Q

Redis: What are some common use cases for using Redis?

A

Data cache, content cache, session store, job and message queue, distributed transactions

186
Q

Redis: What is the SLA on the Basic OSS tier?

A

There is no SLA.

187
Q

Redis: Which tier has non-volatile memory?

A

The Enterprise Flash tier.

Cost-effective large caches powered by Redis Enterprise. Non-volatile memory, which is cheaper than DRAM, on a vm. Reduces the overall per-GB memory cost.

188
Q

Redis: What are the storage/connection limitations between standard/premimum?

A

Basic/Standard: 53gb mem / 20k connections

Premium: 530gb mem / 40k connections

189
Q

Redis: Is the expire resolution in seconds or ms?

A

ms

information about expires are replicated and presisted on disc

190
Q

Redis: Which parts do we need to configure a redis server?

A

Globally unique FQDN, Host address, Post number, Access key

191
Q

Redis: What is the difference between shared caching and private caching?

A

In private caching content is kept private to application instances. This means faster access but also that all applications may not see the same data with private caching.

Shared caching has better availability as it allows us to cluster it

192
Q

CDN: What are the default TTLs for:

Web delivery optimizations
Large file optimizations
Media streaming optimizations

A

Web delivery optimizations - 7 days
Large file optimizations - 1 day
Media streaming optimizations - 1 year

193
Q

Redis: Which .NET class manages connections to Azure Redis Cache?

A

ConnectionMultiplexer

194
Q

Functions: How many instances can the consumption and premium plan scale out to by default?

A

Consumption: 200
Premium: 100

195
Q

Functions: Do functions support all languages?

A

Yes, you can provide custom runtimes through the ‘Custom Handler’ option. The Function.json handles this

196
Q

Functions: Explain triggers and bindings

A

Triggers determine when the function should run

Bindings is a more convenient way to work with azure and allows us to not hardcode secrets and connectionstrings.

You can have multiple input/output bindings or none.
The direction of the trigger is always in

Some bindings can have a special direction like “inout”.

197
Q

Functions: Where should you configure a custom handler?

A

the host.json file will point to the required runtime. The runtime itself does not need to be at root

198
Q

Functions: What is the primary difference between normal functions and durable functions?

A

Durable functions let us write stateful functions

199
Q

Functions: Explain the Function chaining pattern

A

In the chaining pattern we can run functions one after another

200
Q

Functions: Explain the Fan-out/in pattern

A

In durable functions we can parallelize multiple functions and then aggregate the result for example

201
Q

Functions: Explain the Async HTTP APIs pattern

A

In durable functions a function can wait for a long running job to finish before continuing

202
Q

Functions: Explain the human interaction pattern

A

In durable functions a process can wait for a human to provide input

203
Q

Functions: Explain the monitor pattern

A

In durable functions the monitor refers to a recurring process in a workflow. For example we can poll until specific conditions are met or another condition before the function proceeds

204
Q

Functions: Why do orchestrator functions need to be deterministic and why?

A

Because durable functions use event sourcing and must be able to replay the steps until now. This means we can’t use DateTime.Now or Math.Random etc because these would generate a new non-deterministic value.

These need to be pushed to activity functions

205
Q

Functions: Explain the 4 function types; Orchestrator functions, activity functions, entity functions and client functions

A

Client function (entry) -> Calls orchestrator -> Defines a list of activity functions -> activity functions can update entity functiosn for a small piece of state

206
Q

Functions: What is a Task Hub?

A

A logical container used to store things when running durable functions .. the function types can only interact if they are in the same task hub

207
Q

Functions: What can happen if you have multiple task hubs in the same storage account?

A

If functions have not explicitly configured the taskhub in host.json then orchestrations may get stuck in PENDING/RUNNING state

208
Q

LogicApps: Which tier must be used to put LogicApps in a VNET?

A

In the consumption tier you must use “The Integration Service Environment (ISE)”

In the standard tier you can communicate over private endpoints (inbound) and an outbound vnet integration

209
Q

LogicApps: What are the default time outs?

A

Default time out is after 2 minutes (multi tenant), 3 minutes in single tenant and 4 minutes in ISE

210
Q

Misc: In a CRON job what does each star refer to? (, * , ,* ,*)

A

minute, hour, day(month), month, day(week)

211
Q

Misc: Where is a client certificate availaable in .NET?

A

HttpRequest.ClientCertificate

212
Q

Azure Batch: What is azure batch?

A

Run large scale parallel operations.

You use Batch SDK, APIs, command line tools etc to monitor and start your batches.

213
Q

Logging: What is the difference between log-based and standard-based metrics?

A

Log-based metrics are simple logs calculate at query time while standard-metrics are stored as a pre-aggregated time series

214
Q

Logging: Which API can applications use to send REST API request to azure monitor?

A

The Data Collector API. Requests are in JSON

215
Q

Logging: What is Azure Service Health?

A

Azure Service Health will monitor the health of the entire Azure platform and let you create alerts if something is happening that can affect you.

Consists of:
Azure Status (Azure service outages)
Service Health (Personalized view of the services and regions that you use)
Resource health (Individual azure resources such as your VM)

216
Q

Logging: How can pageviews be tracked?

A

They are not tracked by default so you will need to add custom application insights code in javascript to send capture pageviews and send them as telemetry

217
Q

Logging: Can sampling impact pre-aggregated events?

A

No, the collection endpoint pre-aggregates events before ingestion sampling so it will never impact the accuracy

218
Q

Logging: Which availability test should be used for authentication tests?

A

Custom TrackAvailability.

Custom TrackAvailability test is the long term supported solution for multi request or authentication test scenarios.

219
Q

APIM: Which components make up the API Management?

A

API Gateway, Azure Portal, Developer Portal

220
Q

APIM: NAme some benefits of the API Gateway

A

We can configure cross-cutting concerns here such as backend routing, JWT validation, rate limits, quotas, transformations, caches etc

221
Q

APIM: Explain the relation between subscriptions/products in APIM

A

A product is how APIs are surfaced to developers. They can be either Open or Protected.

For protected products a subscription is required

222
Q

APIM: How can developers access a specific revision of your API?

A

Can be passed as a query string

223
Q

APIM: Which OSI layer is the gateway routing performing?

A

This is Layer 7 routing as it is http based and happens in the application layer

224
Q

APIM: What are API Management policies?

A

Collection of statements that are executed before or after an API call.

We can change API behavior through configuration

XML Based

225
Q

APIM: Which 4 policy types exist?

A

inbound
backend
outbond
on-error

226
Q

APIM: How can a subscription key be passed?

A

Through a http header or a query string.

Default http header: Ocp-Apim-Subscription-Key
Default query string: subscription-key

227
Q

APIM: Does APIM have a consumption tier?

A

Yes and its a good fit with serverless technologies

228
Q

SQL: What does the always encrypted option do?

A

Protect sensitive information like credit cards.

Always you to encrypt data inside client applications .. so the unencrypted data never reaches the SQL server. This separates who owns the data and who can read it.

Can be configured for data columns.

229
Q

SQL: What are database pools?

A

Share resources between all databases in the pool.

Works best when the databases have different utilization patterns (if they all peak at the same time they compete for the same resources)

Elastic pools can help not overprovision databases based on peak uses.

An example use case is a SaaS application where each customer has their own DB.

230
Q

Misc: What is the difference between a system assigned managed identity and user assigned managed identity

A

System-assigned managed identity is enabled directly on an azure service instance. Follows the life cycle of the service

User assigned: Stand alone azure resource with its own life cycle.

Both are service principals of a special type.

231
Q

Misc: How to assign a managed identity on a new VM through the az cli?

A

az vm create –resource-group myResourceGroup \
–name myVM –image win2016datacenter \
–generate-ssh-keys \
–assign-identity \
–role contributor \
–scope mySubscription \
–admin-username azureuser \
–admin-password myPassword12

232
Q

Misc: How to acquire a token through managed identities?

A

send a local request from the vm to the azure instance metadata service (IMDS)

GET ‘http://169.254.169.254/metadata/identity/oauth2/token?api-version=2018-02-01&resource=https://management.azure.com/’ HTTP/1.1 Metadata: true

233
Q

Docker: What does the FROM command do?

A

Create a layer from another docker image

234
Q

Docker: What does the COPY command do?

A

Adds files from your Docker client’s current directory

235
Q

Docker: What does the CMD command do?

A

Specifies what command to run within the container

236
Q

Docker: What does the RUN command do?

A

builds your application with make

237
Q

Auth: What is the open source Microsoft Auth libraries called?

A

MSAL

238
Q

Auth: Explain how applications can integrate with Azure Active Directory

A

When you register an application with Azure Active Directory you create an identity configuration for your application

239
Q

Auth: Explain the difference between single tenant and multi tenant

A

Single tenant: Only accessible in your tenant
Multi-tenant: Accessible in other tenants

240
Q

Auth: How is an application defined in Azure AD?

A

Through it’s application object. It resides in the tenant where the application was registered (home tenant)

241
Q

Auth: Explain what an application object is

A

It represents an identity of an application. It is used as a blue print to create one or more service principals

242
Q

Auth: Can an application object have one or many service principals?

A

An application object can have many service principals. Each tenant will have it’s own service principal which is created from the application object (the blue print in the home tenant)

243
Q

Auth: What three objects does an application object describe?

A

How the service can issue tokens in order to access the application
Resources the application might need to access
The actions that the applicatio ncan take

244
Q

Auth: What is the difference between user principal and service principal?

A

Users have a user principal and applications have a service principal

245
Q

Auth: Which three types of service principals exist?

A

Application, Managed identity, Legacy

246
Q

Auth: What are permissions sets called In OAuth 2.0?

A

Scopes. A scope is represented as a string value. Can be done through the scope query parameter.

Read users calenders: https://graph.microsoft.com/Calendars.Read

247
Q

Auth: Difference between delegated permissions and application permissions?

A

Delegated: Used by apps that have a signed-in user present. User or admin consents to the permissions that the app requests.

Application: Used by apps that run without a signed-in user such as background service or daemons. Only admins can consent to these

248
Q

Auth: Which consent types exist?

A

Static user consent, incremental and dynamic user consent and admin consent

249
Q

Auth: Explain static user consent and pros of cons

A

You specify all permissions (scopes) up front in the app’s configuration. If the user has not consented the user will be prompted. Admins can consent on behalf of all users.
Pros: Keeps code nice and simple
Cons: You need a long list of permissions upfront

250
Q

Auth: Explain incremental and dynamic user consent

A

You ask for permissions (scopes) to the user incrementally as you need it.

You add the scope parameter when requesting and access token.

251
Q

Auth: Can incremental and dynamic user consent be used for delegated permissions, application permissions or both?

A

Only delegated permissions.

252
Q

Auth: Explain admin consent

A

When your app needs access to high-privilege permissions.
Still requires static permissions registered for the app.

253
Q

Auth: Explain how incremental and dynamic user consent can be challenging for admin consent

A

Since admin consents need to registered as static permissions, the incremental process might request something not there. Therefor you must register all of the admin permissions in the azure portal.

254
Q

Auth: What are some ways that conditional access can help protect service?

A

Multifactor, only enrolled devices and restricting user locations and IP ranges

255
Q

Auth: Explain an “if” -> “then” scenario for Conditional Access

A

IF I am an user who wants to access Office 365 THEN i must provide MFA

256
Q

Auth: Which app scenario require code to handle Conditional Access challenges?

1) Device-code flow
2) On-behalf-of-flow
3) Integrated Windows authentication flow

A

2)

257
Q

Auth: Oauth 2.0: Explain auth code grant

A

Enables client ap pto obtain authorized access to resource. Requires a user-agent that supports redirection from the Microsoft Identity Platform (Auth server)

1) User request authorization code
2) Code is used to with client_id etc to retrieve tokens

258
Q

Auth: Oauth 2.0 Explain client credentials grant

A

Access resources by using the identity of an appllication. Common for server-to-server interactions without immediate interaction with a user.

Here you must provide client_Id and client_secret

259
Q

Auth: Oauth 2.0 You want to set up server to server communication. Which token grant flow do you use?

A

Client Credentials Grant

260
Q

Auth Oauth 2.0: Explain the device code flow

A

Allows users to sign in to input-constraied devices such as Smart TVs, printers etc.

The device has the user visit a webpage in a browser on another device to sign in.

261
Q

Auth: You want to authorize a Smart TV. Which token grant flow do you use?

A

Device code flow

262
Q

Auth: You want to set up authorization for a SPA. Which token grant flow do you use?

A

Auth Code Grant

263
Q

Auth Oauth 2.0: Explain the On-behalf-of flow

A

A Web API using an identity other than its own to call another web API. (delegation in OAuth)

You pass a user’s identity and permissions through a request chain.

You first get a Token A with Code Grant for example. You then send Token A, client ID and secret to request access to Web API B and return a Token B

264
Q

Auth Oauth 2.0: Explain implicit grant flow

A

Can be used by SPAs etc but is less safe that Code Grant. The process is not to-stepped as in gode grant but instead everything happens in one request. The browser returns the token directly in the url instead of securely over the backchannel.

265
Q

Auth: What is the Microsoft Graph?

A

A gateway to data and intelligence in Microsoft 365

266
Q

Auth: What are Microsoft Graph connectors?

A

Used to send external data into the Microsoft graph services .. The incoming directions

267
Q

Auth: What are Microsoft Graph Data connect?

A

Set of tools to streamline secure and scalable delivery of Microsoft Graph data to popular Azure data stores

The outgoing diretion.

268
Q

Which RBAC role gives access to pull/push images in ACR?

A

AcrPush

269
Q

VM: What is the command to apply a managed identity for a VM?

A

$vm = Get-AzVM -ResourceGroupName myResourceGroup -Name myVM

Update-AzVM -ResourceGroupName myResourceGroup -VM $vm -IdentityType SystemAssigned

270
Q

WebApp: What can you do with a .deployment file and where should it be placed+

A

Place at root of your repo. Can be used to call scripts and deploy a website.

For example can be used to generate static content

271
Q

What is a PreBuild target?

A

An option in csproj files to execute commands

272
Q

Functions: How can you limit the number of parallel executions?

A

Set the batchSize propery in hosts.json

273
Q

Blob: Which tool can be used to copy blobs?

A

AzCopy.
Storage Explorer uses this internally.

Ensures data movement process is recoverable

274
Q

Cosmos: Which RBAC role can provision Cosmos accounts, dsatabases etc?

A

Cosmos DB Operator

275
Q

Insights: What is a multi-step web test?

A

A recording of a sequence of web requests, which can be played back to test more complex scenarios. Multi-step web tests are created in Visual Studio Enterprise and uploaded to the portal for execution.

276
Q

EventGrid: Which two ways of validating a subscription for webhooks exists?

A

ValidationCode Handshake (programmatic) and ValidationURL handshake (Manual)

ValidationUrl is recommended if you control the source code.

277
Q

EventGrid: Explain how a cmdlet can be used with a topic

A

You can react to a new message in a topic by automatically running a cmdlet

278
Q

Is filesystem storage designed for short-term or long term logging?

A

Short-term. Turns itself off after 12 hours. Blob storage is designed for long-term storage of logging

279
Q

Storage: Explain metadata and properties

A

properties are referred to as system properties.

to update meta data you must use the format x-ms-meta

280
Q

Logging: When you want to monitor CPU usage of a webapp do you need to look at the webapp instance or the app service plan?

A

To monior things like CPU percentage, Memory Percentage and Disk Queue length you need to use the AppService Plan.

281
Q

ARM: How do you export a resource group?

A

az group export –name $myRg

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