Connect and consume Azure services and third party services

Question 1

What is Azure API Management? What are the key systems?

Answer 1

A cloud offering for helping organizations publish APIs to external, partner, and internal developers.

The API Gateway
The Azure Portal
The Developer Portal
Products

Question 2

What is the API gateway?

Answer 2

It is the endpoint that:

• Accepts API calls and routes them to your backends
• Verifies API keys, JWT tokens, certificates, and other credentials
• Enforces usage quotas and rate limits
• Transforms your API on the fly without code modifications
• Logs call metadata

Question 3

What is the Azure portal?

Answer 3

The administrative interface where you set up your API program:

• Define or import API schema
• Package APis into products
• Setup policies
• Manage users

Question 4

What is the developer portal?

Answer 4

A place were developers can:

• Read api documentation
• Try out an API via the interactive console
• Get an account and subscribe to get API keys
• Access analytics on their usage

Question 5

What are products in API management?

Answer 5

Groupings of APIs that developers subscribe to in order to access those APIs. They can be Open or Protected

Question 6

Discuss Groups in Product management

Answer 6

Groups come in three forms:

• Administrators - Azure subscription administrators.
• Developers - Authenticated developer portals that build applications using the APIs.
• Guests - Unauthenticated developer portal users, such as prospective customers. View don’t call.

Question 7

What are policies for APIm?

Answer 7

Policies allow the azure portal to change the behavior of the API through configuration. Generally XML / JSON formating.

Question 8

How are policies configured?

Answer 8

They have four parts - inboud, backend, outbound, and on-error

Generally:

Question 9

What is an Advanced Policy?

Answer 9

Advance policies can:

• Control flow
• Forward requests
• Limit concurrency
• Log to Event Hub
• Mock response
• Retry

Question 10

Show examples of the various advanced policies:

Answer 10

Control flow:

Forward request:

Limit concurrency:

Question 11

What is a subscription key?

Answer 11

A way to secure the APIs to only those that have a validly generated key. They are auto-generated anc can be passed through in the headers of a client request.

Question 12

What are the two types of queue mechanisms in Azure? What are the differences?

Answer 12

Service Bus queues - Part of broader messaging infrastructure. Integrate with applications or components. Span lots of protocols, contracts, domains, networks.
Storage queues - Part of Azure Storage infrastructure - allow you to store large number of messages.

Question 13

When would you consider using service bus queues?

Answer 13

• You solution needs to receive messages without having to poll the queue
• You solution requires to provide a guaranteed FIFO
• You solution needs to support automatic duplicate detection
• You want your application to process messages as parallel long-running streams
• Your solution requires transactional behavior
• Your application handles messages that can exceed 64 KB but won’t approach 256KB limit

Question 14

When would you consider using storage queues?

Answer 14

• Your application must store over 80 GB of messages
• Your application wants to track progress for processing a message in the Queue
• You require server side logs of all the transactions executed against your queues.

Question 15

What are some advanced features of Service buses?

Answer 15

• Message sessions
• Autoforwarding
• Dead-letter queue
• Scheduled delivery
• Message deferral
• Batching
• Transactions
• Filtering and actions
• Autodelete on idle
• Duplicate detection
• Geo-disaster recovery

Question 16

What is Azure Event Grid?

Answer 16

Azure event grid is an eventing backplane that enables event-driver, reactive programming. It uses the publish-subscripe model.

Question 17

What are the five concepts in event grid?

Answer 17

Events - what happened
Event sources - Where it took place
Topics - Where the event gets published
Event subscriptions - Who needs to see the topics
Event handlers - The app or service reacting to the event

Question 18

What is an event schema? What does it look like?

Answer 18

4 sets of string properties:

[
  {
    "topic": string,
    "subject": string,
    "id": string,
    "eventType": string,
    "eventTime": string,
    "data":{
      object-unique-to-each-publisher
    },
    "dataVersion": string,
    "metadataVersion": string
  }
]

Question 19

What is event delivery durability? How does it work?

Answer 19

Even delivery durability means that event grid tries to deliver each event at least once.

It is configured by a retry schedule and retry policy

Retry policy is configures by:

• max-delivery-attempt
• event-time-to-live

Question 20

How can you control access to events?

Answer 20

Through RBAC - built in roles include:

• Event Grid Subscription Reader
• Event Grid Subscription Contributor
• Event Grid Contributor
• Event Grid Data Sender

Question 21

How can you use azure services to consume event grid events?

Answer 21

• Azure logic apps with event grid connector
• Azure automation via webhook
• Azure functions with event grid trigger

Question 22

What type of filtering can you do on events?

Answer 22

• Event type
• Subject begins with or ends with
• Advanced fields and operators

Question 23

What is Azure Event Hubs? What are some key features?

Answer 23

It is a big data streaming platform and event ingestion service. It can receive and process millions of events per second.

Fully managed PaaS
Real-time and batch processing
Scalable
Rich ecosystem

Question 24

What are the key features of event hubs?

Answer 24

• Event hub client - the primary interface
• Event hub produce - type of client that serves as a source of telemetry data, diagnostics information, usage, etc.
• Event hub consumer - Type of client that reads information from the Even hub
• Partition - ordered sequence of events that is held in an event hub
• Consumer group - a view of the entire event hub
• Event receivers - any entity that reads event data
• Throughput units or processing unit - prepurchased units of capacity

Question 25

How does event hubs capture work?

Answer 25

It is a time-retention durable buffer. Each partition is an independent segment of data and is consumed independently, given retention periods.

Capture enables you to specify your own azure blob storage account and container, or Azure data lake store, which are used to store the captured data.