A Cantrill - Practice Exam #1

Question 1

Which DNS Record type is used to commonly verify domain ownership?

Answer 1

TXT

Question 1

What type of EC2 volume is best to host a small temporary data base and requires high IOPS?

Answer 1

Instance Store.

Question 2

What is best for diagnosing performance issues on an EBS GP2 volume that looks to have high IOPS demands?

CloudWatch or CloudWatch Logs?

Question 3

What is true of DDB “Eventually consistent reads” ?

Answer 3

-Uses less RCU than a strongly consistent read
-You can receive outdated data

Question 4

What is RCU in DDB?

Question 5

What is a way to improve a User Data script that has grown too long and slows the deployment and launch of the EC2?

Answer 5

Create and use a custom AMI

Question 6

What does S3 transfer acceleration do?

Answer 6

Improves speed and performance of S3 objects delivered to users.

Question 7

If you need to allow access to an S3 bucket in your account to IAM users from another account what should you do?

*Objects which are uploaded MUST be owned by your account, NOT the external account

Answer 7

Use an IAM role in your account

Question 8

Which DNS record type is generally used to point R53 record sets at AWS logical resources?

Answer 8

A + Alias records

Question 9

difference between Session Manager and EC2 Connect ?

Question 10

If you perform an EC2 reboot, will the instance store data be lost?

Answer 10

No data persists on an OS reboot. (check/test in AWS IRL)

Question 11

CloudHSM + (SSE3 or Client side encryption) for FIPS 140-2 Level 3 framework

Question 12

Image in CF is not the new image that was just uploaded to S3 (origin). How do you get the CF image to match the new S3 Image?

Answer 12

Invalidate the object on the CF Distribution.

Question 13

AWS provide a registry of open data sets which can be used by customers within their applications. How much does it cost to use these datasets within AWS products?

Answer 13

Its FREE!!!

Question 14

What needs to be enabled in order for S3 CRR to work effectively?

Answer 14

Versioning MUST be enabled on both buckets, in order for CRR to work.

Question 15

What happens when you delete the first full EBS snapshot in a sequence of snapshots? Can you still do a full restore of the Volume?

Answer 15

Deleting the snapshot doesnt actually delete the data. The next snapshot becomes the new “Full” snapshot. YES you can do a full restore

Question 16

Is CPU utilization a default or custom Cloudwatch metric?

Answer 16

CPU util is DEFAULT in CW.

Question 17

What feature within AWS allows you to control access to an S3 bucket so that everything BUT CloudFront Access is denied ?

Answer 17

OAI

Question 18

A website running on EC2s and using cloudfront is expecting a large surge of usage, and is concerned that existing infra wont be able to handle it. What would be a good architecture here?

Answer 18

Develop the system using Lambda. (See ChatGPT)

Question 19

If an EIP is not associated with anything, does it cost $?

Answer 19

EIPs have a cost even if not associated with anything.

Question 20

EIPs are per account AND which of the following?

Per AZ
OR
Per Region?

Answer 20

EIPs are per account and per REGION.

Question 21

Default SQS queues do not require messages to be delivered in the same order that they were received, T or F?

Answer 21

True. SQS queues by default do not deliver messages in the same order that they were received.

For that you would need a FIFO SQS queue.

Question 22

Is a standard SQS queue designed to handled the same message delivered twice ?

Answer 22

Yes, Standard SQS queue should be able to handle the same message delivered twice.

Question 23

What is true of instance type and size in regards to cluster placement groups?

Answer 23

When adding instances to a cluster placement group, all instances must be of the same instance type and size.

Question 24

What do you do is there is NOT enough capacity to add to existing cluster placement group?

Answer 24

terminate the current instances and relaunch them together to try and place all instances at once.

Question 25

How do you need to capture an RDS snapshot that lasts at LEAST 6 months?

Answer 25

Manual snapshot of RDS instance.

Question 26

How long are RDS automated backups?

Answer 26

automated backups in RDS can be retained for a maximum 35 days. If you need a backup retained longer than 35 days, you need a Manual snapshot

Question 27

Which AWS products and features can be used to allow network connectivity between two or more VPCs?

Answer 27

TGW and VPC peering

Question 28

If you enable CRR on an S3 bucket, will objects in the bucket before enabling CRR be moved over to the other bucket?

Answer 28

No Only new objects added AFTER CRR enabled will be replicated.

Question 29

EC2 enhanced networking delivers better Packet per Second (PPS) performance, T or F?

Answer 29

True. EC2 enhanced networking delivers better Packet per Second (PPS) performance

Question 30

What performance benefit does Enhanced Networking provide in terms of Latency?

Answer 30

Lower and consistent latency

Question 31

What can improve heavy load on DDB (heavy read operations) that is cost effective and little admin overhead ?

Answer 31

Increase RCU.

Question 32

What is an appropriate and cost-effective use for the S3 storage class Standard-Infrequent Access?

Answer 32

Objects stored with 11 9’s % durability. And require millisecond retrieval.

Question 33

There is an SQS queue with low volume and the processing tier is 5 static instances (not scaled with ASG)

what can be done to reduce the SQS bill that is too much $$?

Answer 33

-Switch to Long Polling
-Re-Provision the instances using an ASG based on queue length