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aws saa-c03 > TD Exam 3 - Short review > Flashcards

TD Exam 3 - Short review Flashcards

1
Q

Does Fargate have ephemeral storage by default

A

Yes, 20 GiB

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2
Q

Can you use any docker image in Lambda

A

No, you have to refactor the code and build app from AWS-provided base image

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3
Q

Is there downtime when using AWS Database Migration Service

A

There is virtually none.

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4
Q

Are ongoing changes replicated when using Database Migration Service

A

Yes

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5
Q

Does taking a snapshot to migrate a database entail downtime

A

Yes

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6
Q

Can you change an Aurora instance class to serverless

A

No

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7
Q

Are you billed when your on-demand EC2 instance is preparing to hibernate with a “stopping” state

A

Yes

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8
Q

Are you billed when your on-demand EC2 is in “pending” state

A

No

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9
Q

Are you billed when your reserved instance is in “Terminated” state

A

Yes

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10
Q

Are you billed when your Spot instance is preparing to stop with a “stopping” state

A

No

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11
Q

Can you have a retention period of 90 days for RDS automated backups

A

No, max is 35 days

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12
Q

Can you configure RDS to automatically export a backup to S3 customer-managed bucket

A

No, this has to be done manually

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13
Q

What should you use to have an RDS backup with 90 days retention policy

A

AWS Backup

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14
Q

What is S3 Glacier expedited retrieval

A

Allows you to access Glacier data rapidly (1-5 mins for below 250 MB)

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15
Q

What is provisioned retrieval capacity for S3

A

It ensures that capacity for expedited retrieval is available when you need it

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16
Q

What is the capacity of an expedited retrieval unit

A

3 expedited retrieval every five minutes and 150 MB/s

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17
Q

What is the length of bulk retrieval

A

5-12 hours

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18
Q

What is active-passive failover

A

When you want the secondary to be on standby

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19
Q

What is active-active failover

A

When you want all of your resources to be available the majority of the time

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20
Q

Can you have active-active failover with one primary and one secondary

A

No

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21
Q

Can you use healthchecks with R53 weighted routing

A

Yes

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22
Q

What happens when you use Healthcheck with R53 weighted routing

A

If a selected record is unhealthy, the process of selection is repeated until a healthy record is selected

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23
Q

Is it true that EC2 instances in a private subnet can communicate with the internet only if they have an elastic IP

A

No, it can also have a public IP via a NAT instance or NAT gateway

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24
Q

What is every subnet created automatically associated with

A

The main route table of the VPC

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25
Q

What makes a subnet public

A

If it’s traffic is routed to an internet gateway

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26
Q

What is the allowed block sizes for a VPC

A

/16 (65536 IPs and /28 (16 IPs)

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27
Q

Which is more cost-effective, Parameter Store or Secrets Manager?

A

Parameter store

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28
Q

What should you use if you are storing mostly application parameters, Parameter Store or Secrets Manager?

A

Parameter Store

29
Q

Are you still billed for a stopped reserved instance

A

Yes

30
Q

What should you do to avoid being billed from a no-longer needed Reserved instance

A

Terminate it
If it is still running after reservation term, you get charged on-demand
If it is only stopped, it could be started up again
Also, you would be charged if you had Elastic IP adresses

31
Q

Can you sell EC2 reservations

A

Yes, using the AWS Reserved Instance Marketplace

32
Q

What is AWS Glue job bookmarking

A

It is a mechanism that allows AWS Glue to keep track of where a job is left off in case it gets interrupted or fails for any reason

33
Q

How does Glue Job bookmarking work

A

By storing the state of a job in a data store independant from the job itself

34
Q

What is instance hibernation

A

Allows you to pause and resume instances, reduces startup time

35
Q

What do you pay for when an instance is in hibernation

A

EBS volumes and Elastic IP

36
Q

How do you enable hibernation for an existing ec2 instance

A

You have to migrate your app to a new EC2 instance

37
Q

Can you enable or disable hibernation on an instance after it has been created

A

No

38
Q

Why would requests fail when you use the EC2 API to launch 50 instances in an AZ

A

There is a vCPU-based on-demand instance limit per region

39
Q

How do you increase the limit of EC2 instances you can launch in a region

A

Submit a limit increase form to AWS to increase the vCPU-based limit per region

40
Q

What is Amazon DynamoDB Accelerator (DAX)

A

Fully managed, HA, in-memory cache for dynamodb that delivers up to 10x performance improvement

41
Q

Is Auto-scaling enabled by default in DynamoDB

A

No

42
Q

How do you increase performance of a serverless app based on Dynamodb, API Gateway and lambda

A

Turn on caching (API Gateway)
Enable DynamoDB global replication
Enable DynamoDB Accelerator (DAX) and ensure Auto Scaling is enabled and increase maximum provisioned reand and write capacity

43
Q

What is AWS Transit Gateway

A

It provides a hub and spoke design for connecting VPCs and onprem networks

44
Q

Can VPN provide consistent and dedicated access to onprem network

A

No

45
Q

If a company has DX connection and wants its AWS accounts to have consistent and dedicated access to its network services, what should it do?

A

Create new DX Gateway and integrate it with existing DX Connection
Set up Transit Gateway between AWS accounts and associate it with Direct Connect gateway

46
Q

What is Firehose used for

A

Load streaming data into data stores and analytics tools

47
Q

What is AppSync used for

A

It makes it easy to build collaborative apps that keep shared data updated in RT

48
Q

What is CReationPOlicy used for in CloudFormation

A

Prevent a resource status from reaching create complete until success signals received (or timeout)

49
Q

How do you send a success signal with CloudFormation

A

cfn-signal helper script

50
Q

What do you do to ensure read requests are load balanced between read replicas in Aurora

A

Use built-in reader endpoint

51
Q

Which is cheaper, interface endpoint or gateway endpoint

A

Gateway endpoint

52
Q

What do you pay for when using a gateway endpoint

A

No additional charge, you still pay standard charges for data transfer and resource usage

53
Q

What do you pay for when using interface endpoint

A

Hourly rate for every provisioned Interface endpoint + standard rates

54
Q

What should you do to increase disk space without impacting performance in RDS

A

Modify db instance settings to enable storage autoscaling

55
Q

Is there downtime when using RDS autoscaling

A

No

56
Q

What is a potential downside of manually increasing allocated db instance storage for RDS

A

Might cause performance degradation during the change

57
Q

How do you enforce different permissions to IAM users that do not have MFA

A

You can use an IAM policy

58
Q

What happens to EBS root volumes by default when an instance is terminated

A

They are deleted

59
Q

How can you prevent EBS root volume deletion on instance termination

A

Set DeleteOnTermination attribute of EBS volumes

60
Q

What is SNI Custom SSL

A

Allows multiple domains to serve SSL over same IP

61
Q

When can you use an IAM policy to allow access to KMS key

A

If key policy explicitly allows it

62
Q

What is AWS Cost Explorer

A

Service that helps ou visualize, understand and analyze AWS costs and usage

63
Q

What should you use if you want to programmatically query cost and usage data

A

Cost Explorer API

64
Q

How long are data records kept for in Kinesis by default

A

24h

65
Q

What is the maximum data retention period for kinesis

A

365 days

66
Q

What is a limitation when running lambda inside a VPC

A

It will need an appropriate number of subnet IPs and ENIs

67
Q

What kind of exception will you get if your lambda inside a subnet runs out of IP or ENI

A

EC2ThrottleException

68
Q

What is an Elastic Fabric Adapter

A

Network device to accelerate HPC and machine learning applications

69
Q
A

aws saa-c03 (18 decks)

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