[2021-New] Amazon AWS-Certified-DevOps-Engineer-Professional Dumps With Update Exam Questions (21-30)

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Q1. When thinking of DynamoDB, what are true of Global Secondary Key properties?

A. The partition key and sort key can be different from the table.

B. Only the partition key can be different from the table.

C. Either the partition key or the sort key can be different from the table, but not both.

D. Only the sort key can be different from the table.

Answer: A

Explanation:

Global secondary index — an index with a partition key and a sort key that can be different from those on the table. A global secondary index is considered "gIobaI" because queries on the index can span all of the data in a table, across all partitions.

Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Secondarylndexes.html

Q2. Which major database needs a BYO license?

A. PostgreSQL

B. NIariaDB

C. MySQL

D. Oracle

Answer: D

Explanation:

Oracle is not open source, and requires a bring your own license model.

Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_OracIe.htm|

Q3. Your API requires the ability to stay online during AWS regional failures. Your API does not store any state, it only aggregates data from other sources - you do not have a database. What is a simple but effective way to achieve this uptime goal?

A. Use a CloudFront distribution to serve up your API. Even if the region your API is in goes down, the edge locations CIoudFront uses will be fine.

B. Use an ELB and a cross-zone ELB deployment to create redundancy across datacenters. Even if a region fails, the other AZ will stay online.

C. Create a Route53 Weighted Round Robin record, and if one region goes down, have that region redirect to the other region.

D. Create a Route53 Latency Based Routing Record with Failover and point it to two identical deployments of your stateless API in two different regions. Make sure both regions use Auto Scaling Groups behind ELBs.

Answer: D

Explanation:

Latency Based Records allow request distribution when all is well with both regions, and the Failover component enables fallbacks between regions. By adding in the ELB and ASG, your system in the survMng region can expand to meet 100% of demand instead of the original fraction, whenever failover occurs.

Reference: http://docs.aws.amazon.com/Route53/Iatest/DeveIoperGuide/dns-failover.html

You are designing an enterprise data storage system. Your data management software system requires mountable disks and a real filesystem, so you cannot use S3 for storage. You need persistence, so you will be using AWS EBS Volumes for your system. The system needs as low-cost storage as possible, and access is not frequent or high throughput, and is mostly sequential reads. Which is the most appropriate EBS Volume Type for this scenario?

A. gpl

B. iol

C. standard

D. gp2

Q4. You need to create a simple, holistic check for your system's general availablity and uptime. Your system presents itself as an HTTP-speaking API. What is the most simple tool on AWS to achieve this with?

A. Route53 Health Checks

B. CIoudWatch Health Checks

C. AWS ELB Health Checks

D. EC2 Health Checks

Answer: A

Explanation:

You can create a health check that will run into perpetuity using Route53, in one API call, which will ping your service via HTTP every 10 or 30 seconds.

Amazon Route 53 must be able to establish a TCP connection with the endpoint within four seconds. In addition, the endpoint must respond with an HTTP status code of 200 or greater and less than 400 within two seconds after connecting.

Reference:

http://docs.aws.amazon.com/Route53/latest/DeveIoperGuide/dns-failover-determining-health-of-endpoint s.htmI

Q5. What is the scope of an EC2 EIP?

A. Placement Group

B. Availability Zone

C. Region

D. VPC

Answer: C

Explanation:

An Elastic IP address is tied to a region and can be associated only with an instance in the same region. Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resources.htmI

Q6. What is required to achieve gigabit network throughput on EC2? You already selected cluster-compute, 10GB instances with enhanced networking, and your workload is already network-bound, but you are not seeing 10 gigabit speeds.

A. Enable biplex networking on your servers, so packets are non-blocking in both directions and there's no switching overhead.

B. Ensure the instances are in different VPCs so you don't saturate the Internet Gateway on any one VPC.

C. Select PIOPS for your drives and mount several, so you can provision sufficient disk throughput.

D. Use a placement group for your instances so the instances are physically near each other in the same Availability Zone.

Answer: D

Explanation:

You are not guaranteed 10gigabit performance, except within a placement group.

A placement group is a logical grouping of instances within a single Availability Zone. Using placement groups enables applications to participate in a low-latency, 10 Gbps network. Placement groups are recommended for applications that benefit from low network latency, high network throughput, or both. Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html

Q7. When thinking of AWS OpsWorks, which of the following is not an instance type you can allocate in a stack layer?

A. 24/7 instances

B. Spot instances

C. Time-based instances

D. Load-based instances

Answer: B

Explanation:

AWS OpsWorks supports the following instance types, which are characterized by how they are started and stopped. 24/7 instances are started manually and run until you stop them.Time-based instances are run by AWS OpsWorks on a specified daily and weekly schedule. They allow your stack to automatically adjust the number of instances to accommodate predictable usage patterns. Load-based instances are automatically started and stopped by AWS OpsWorks, based on specified load metrics, such as CPU utilization. They allow your stack to automatically adjust the number of instances to accommodate variations in incoming traffic. Load-based instances are available only for Linux-based stacks. Reference: http://docs.aws.amazon.com/opsworks/latest/userguide/weIcome.htmI

Q8. You are building a game high score table in DynamoDB. You will store each user's highest score for each game, with many games, all of which have relatively similar usage levels and numbers of players. You need to be able to look up the highest score for any game. What's the best DynamoDB key structure?

A. HighestScore as the hash / only key.

B. GameID as the hash key, HighestScore as the range key.

C. GameID as the hash / only key.

D. GameID as the range / only key.

Answer: B

Explanation:

Since access and storage for games is uniform, and you need to have ordering within each game for the scores (to access the highest value), your hash (partition) key should be the GameID, and there should be a range key for HighestScore.

Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GuideIinesForTabIes.htmI#GuideIi nesForTabIes.Partitions

Q9. Which of these is not a Pseudo Parameter in AWS CIoudFormation?

A. AWS::StackName

B. AWS::AccountId

C. AWS::StackArn

D. AWS::NotificationARNs

Answer: C

Explanation:

This is the complete list of Pseudo Parameters: AWS::Account|d, AWS::NotificationARNs, AWS::NoVaIue, AWS::Region, AWS::StackId, AWS::StackName

Reference:

http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/pseudo-parameter-reference.html

Q10. Fill the blanks: helps us track AWS API calls and transitions, helps to understand what resources we have now, and allows auditing credentials and logins.

A. AWS Config, CIoudTraiI, IAM Credential Reports

B. CIoudTraiI, IAM Credential Reports, AWS Config

C. CIoudTraiI, AWS Config, IAM Credential Reports

D. AWS Config, IAM Credential Reports, CIoudTraiI

Answer: C

Explanation:

You can use AWS CIoudTraiI to get a history of AWS API calls and related events for your account. This includes calls made by using the AWS Management Console, AWS SDKs, command line tools, and higher-level AWS services.

Reference: http://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-user-guide.html