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C# > K8's/TS/Http/MVC/MSA/AJAX > Flashcards

K8's/TS/Http/MVC/MSA/AJAX Flashcards

1
Q

A ________ tool helps in deployment, scaling, networking, and monitoring of your containers.

A

container orchestration

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2
Q

It provides a framework for managing containers and the microservices they contain at scale.

A

Container Orchestration

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3
Q

____ is a container orchestration tool.

A

Kubernetes

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4
Q

It provides tools that help deploy and manage containers that run over a network.

A

Kubernetes

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5
Q

It lets us build application services that span multiple containers, schedule containers across a cluster, scale those containers, and manage their health over time.

A

Kubernetes

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6
Q

Similar tools to Kubernetes

A

Docker Swarm and Apache Mesos

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7
Q

K8s Architecture

A

Cluster
Node
Pod
Containers

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8
Q

Primary node agent interacts with master node

A

Kubelet

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9
Q

Software that runs containers

A

Container runtime

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10
Q

Network proxy maintains network rules on nodes

A

Kube-proxy

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11
Q

Cmd line tool for k8s

Allows you to interact with the API in the master node to deploy and manage your cluster

A

Kubectl

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12
Q

Lets you query and manipulate the state of objects in K8s

A

API

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13
Q

Local k8s

A

Minikube

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14
Q

Azure K8s Service

A

AKS

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15
Q

Container runtime

A

Docker

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16
Q

Deploying with k8s

A

Object config file
Pods
Deployments
Services

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17
Q

Superset of JS, which means that all valid JS is valid ____

JS flavor that imposes type checking and “compile” time errors

Statically typed

CANNOT IN ITSELF BE RUN IN THE BROWSER HAS TO BE TRANSPILED BEFORE IT’S EXECUTED (using node.js and tsc)

Still JS under the hood

A

Typescript

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18
Q

All valid JS types are TS types

A

True

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19
Q

(TS type) literally any type, when you assign something to any, you are resigning to JS’s type inference system (i.e. letting JS take the wheel and infer the type for you)

A

Any

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20
Q

a type safe any. Ensures someone using the type declares what the type is

A

Unknown

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21
Q

a function that returns undefined or no return value. Like how you’d use void as a return type in C#

A

Void

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22
Q

what’s the difference between js classes and ts classes

A

TS classes have access modifiers

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23
Q

Modules in ts

A

Works like a JS module but has some additional support

Import multiple modules from a single script file, only import types (type safe way of importing)

This helps in organizing your code in their own files and using them in different places

So you expose something for use using the export keyword and you use that something in another file using the import keyword

Any declaration (variable, function, class, type alias, interface) can be exported by adding the export keyword before the type keyword.

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24
Q

Stands for Asynchronous Javascript and XML, More of technique than a specific technology

A

AJAX

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25
Q

An older implementation of AJAX

Object that is used to send a request to the server and receive the response

Again the XML in its name is for traditional reasons

A

XMLHttpRequest

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26
Q

Newer JS native implementation of AJAX

A

Fetch API

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27
Q

Uses promises to achieve asynchronisity

A

Fetch API

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28
Q

_____ represent the eventual completion (or failure) of an asynchronous operation and its resulting value

A

Promises

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29
Q

____ are objects in JS

A

Promises

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30
Q

what does MSA stand for?

A

Micro Service Architecture

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31
Q

Monolithic vs SOA vs MSA

A 
monolithic = single unit
SOA = coarse-grained
microservices = fine-grained
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32
Q

Microservice Characteristics

A

SRP (single responsibility principle)
Encapsulated
Independent

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33
Q

MSA pros

A 
Scalability
Deployment
Simplicity
Fault tolerant
Testability
Language agnostic
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34
Q

MSA cons

A

Complexity
Monitoring
Eventual consistency
Chattiness

35
Q

what does MVC stand for?

A

model view controller

36
Q

Design pattern used to separate concerns (yes we’re discussing this again)

37
Q

a web application framework developed by Microsoft that implements the model–view–controller pattern.

A

ASP.NET MVC

38
Q

MVC vs ASP.NET MVC

A

MVC is a design pattern, ASP.NET MVC is a web app framework that implements the mvc design pattern

39
Q

Send from client to server

A

HTTP request

40
Q

what are the 3 parts to and http request

A

Start line
Method - describes action to be performed
Target - describes where to send the request

Header
Meta data
Ex: content type - what data type the body has

Body
Data you want the server to process

41
Q

Describes what action the client wants the server to perform on a given resource

A

HTTP verbs/methods

42
Q

Get resource

43
Q

Create a new resource

44
Q

Update resource

45
Q

Delete resource

A

HTTP DELETE

46
Q

Returns just the headers of a get response

47
Q

what are the less common http verbs?

A

connect, options, trace, patch

48
Q

A method is said to be safe if it does not change the state of the resource
(Ex: HTTP GET, HTTP HEAD)

A

Safe methods

49
Q

A method is said to be ______ if the state of the resource is only affected once by any changes implemented by this method

A

idempotent

50
Q

examples of idempotent methods

A

DELETE, PUT, HEAD, GET

51
Q

From server to client

A

HTTP Response

52
Q

what are the 3 parts to an HTTP Response

A

Status line
Headers
Body

53
Q

errors that are the client’s fault, client side errors (“Your fault”)

54
Q

errors that are the server’s fault, server side errors (“My bad”)

55
Q

redirection (“We moved that”)

56
Q

communicating success (“Success”)

57
Q

informational (“Mkay”)

58
Q

____ give a short description of whether an interaction is successful or not.

A

Status codes

59
Q

Bad request, generic error message

60
Q

Payment Required

61
Q

Not found

62
Q

Method not allowed (if server does not support method)

63
Q

Internal Server Error, try again later we’re having problems right now

64
Q

Not Implemented, if a method isn’t implemented (if it’s under construction)

65
Q

Bad Gateway

66
Q

what does dns stand for?

A

Domain Name System (DNS)

67
Q

_______ translates domain names to IP addresses so browsers can load Internet resources.

68
Q

Used to describe a group of queries that are executed as a batch that should completely succeed or not have any effect on the database at all

A

Transactions

69
Q

Sublanguage to control Transactions

70
Q

TCL commands

A

Commit
Savepoint
Rollback

71
Q

what does ACID stand for?

A

Atomic
Consistent
Isolation
Durable

72
Q

All or nothing

Either the transaction completely succeeds without errors and persists to a non volatile data storage system or it fails

73
Q

Guarantees committed transaction state

Makes sure that your transaction is not half finished

Consistency is a property ensuring that only valid data following all rules and constraints is written in the database.
When a transaction results in invalid data, the database reverts to its previous state, which abides by all customary rules and constraints.

A

Consistent

74
Q

guarantees the individuality of each transaction, and prevents them from being affected from other transactions. It ensures that transactions are securely and independently processed at the same time without interference, but it does not ensure the order of transactions.

Two transactions, affecting same data, one will have to wait

75
Q

A transaction isn’t considered complete until it is persisted in a non volatile data storage; by that it means your device could turn off and the data would still be saved

76
Q

_____ define the degree to which a transaction must be isolated from the data modifications made by any other transaction in the database system

A

Isolation levels

77
Q

Ways other transactions can affect your transaction:

A

Dirty Read
non-repeatable read
phantom read

78
Q

when your transaction reads uncommitted updates done by another transaction

A

Dirty Read

79
Q

when your transaction reads committed updates done by another transaction

A

Non Repeatable Read

80
Q

some rows may be added or removed due to the updates done by another transaction

A

Phantom Read

81
Q

Does not protect transaction from anything, your transaction can read uncommitted data from other transactions

Useful for when you read and write all the time, like netflix, or if you’re tracking number of covid cases, you can just reload

A

Read uncommitted (zero isolation)

82
Q

Protects transaction from dirty read but not from non repeatable read.

Meaning you can still read committed data from other transactions.

Locks updates unless committed

SQLServer Default

A

Read committed

83
Q

Protects transaction from non repeatable read but not from phantom read.

When querying batches of data you’d still be able to get a different set of rows when you query the table before and after updates from another table occur

Locks row

A

Repeatable read

84
Q

Protects transaction from phantom read. Congratulations. You’ve reached the highest isolation level.

This guarantees total isolation.

It’s essentially locking the data set you’re working with from other transactions.

A

Serializable

C# (9 decks)

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