AWS-SysOps Exam
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Q11. - (Topic 1)
You have two Elastic Compute Cloud (EC2) instances inside a Virtual Private Cloud (VPC) in the same Availability Zone (AZ) but in different subnets. One instance is running a database and the other instance an application that will interface with the database. You want to confirm that they can talk to each other for your application to work properly.
Which two things do we need to confirm in the VPC settings so that these EC2 instances can communicate inside the VPC? Choose 2 answers
A. A network ACL that allows communication between the two subnets.
B. Both instances are the same instance class and using the same Key-pair.
C. That the default route is set to a NAT instance or internet Gateway (IGW) for them to communicate.
D. Security groups are set to allow the application host to talk to the database on the right port/protocol.
Answer: A,D
Q12. - (Topic 3)
A user is using the AWS EC2. The user wants to make so that when there is an issue in the EC2 server, such as instance status failed, it should start a new instance in the user’s private cloud. Which AWS service helps to achieve this automation?
A. AWS CloudWatch + Cloudformation
B. AWS CloudWatch + AWS AutoScaling + AWS ELB
C. AWS CloudWatch + AWS VPC
D. AWS CloudWatch + AWS SNS
Answer: D
Explanation:
Amazon SNS can deliver notifications by SMS text message or email to the Amazon Simple Queue Service (SQS. queues or to any HTTP endpoint. The user can configure a web service (HTTP End point. in his data centre which receives data and launches an instance in the private cloud. The user should configure the CloudWatch alarm to send a notification to SNS when the “StatusCheckFailed” metric is true for the EC2 instance. The SNS topic can be configured to send a notification to the user’s HTTP end point which launches an instance in the private cloud.
Q13. - (Topic 1)
You have set up Individual AWS accounts for each project. You have been asked to make sure your AWS Infrastructure costs do not exceed the budget set per project for each month.
Which of the following approaches can help ensure that you do not exceed the budget each month?
A. Consolidate your accounts so you have a single bill for all accounts and projects
B. Set up auto scaling with CloudWatch alarms using SNS to notify you when you are running too many Instances in a given account
C. Set up CloudWatch billing alerts for all AWS resources used by each project, with a notification occurring when the amount for each resource tagged to a particular project matches the budget allocated to the project.
D. Set up CloudWatch billing alerts for all AWS resources used by each account, with email notifications when it hits 50%. 80% and 90% of its budgeted monthly spend
Answer: C
Q14. - (Topic 3)
A user has created a queue named “awsmodule” with SQS. One of the consumers of queue is down for 3 days and then becomes available. Will that component receive message from queue?
A. Yes, since SQS by default stores message for 4 days
B. No, since SQS by default stores message for 1 day only
C. No, since SQS sends message to consumers who are available that time
D. Yes, since SQS will not delete message until it is delivered to all consumers
Answer: A
Explanation:
SQS allows the user to move data between distributed components of applications so they can perform different tasks without losing messages or requiring each component to be always available. Queues retain messages for a set period of time. By default, a queue retains messages for four days. However, the user can configure a queue to retain messages for up to 14 days after the message has been sent.
Q15. - (Topic 2)
A sys admin is trying to understand the Auto Scaling activities. Which of the below mentioned processes is not performed by Auto Scaling?
A. Reboot Instance
B. Schedule Actions
C. Replace Unhealthy
D. Availability Zone Balancing
Answer: A
Explanation:
There are two primary types of Auto Scaling processes: Launch and Terminate, which launch or terminat
instances, respectively. Some other actions performed by Auto Scaling are:
AddToLoadbalancer,
AlarmNotification, HealthCheck, AZRebalance, ReplaceUnHealthy, and ScheduledActions.
Q16. - (Topic 3)
A user has configured Auto Scaling with the minimum capacity as 2 and the desired capacity as 2. The user is trying to terminate one of the existing instance with the command:
as-terminate-instance-in-auto-scaling-group<Instance ID> --decrement-desired-capacity
What will Auto Scaling do in this scenario?
A. Terminates the instance and does not launch a new instance
B. Terminates the instance and updates the desired capacity to 1
C. Terminates the instance and updates the desired capacity and minimum size to 1
D. Throws an error
Answer: D
Explanation:
The Auto Scaling command as-terminate-instance-in-auto-scaling-group <Instance ID> will terminate the specific instance ID. The user is required to specify the parameter as --decrement-desired-capacity. Then Auto Scaling will terminate the instance and decrease the desired capacity by 1. In this case since the minimum size is 2, Auto Scaling will not allow the desired capacity to go below 2. Thus, it will throw an error.
Q17. - (Topic 3)
A user is trying to connect to a running EC2 instance using SSH. However, the user gets a Host key not found error. Which of the below mentioned options is a possible reason for rejection?
A. The user has provided the wrong user name for the OS login
B. The instance CPU is heavily loaded
C. The security group is not configured properly
D. The access key to connect to the instance is wrong
Answer: A
Explanation:
If the user is trying to connect to a Linux EC2 instance and receives the Host Key not found error the probable reasons are: The private key pair is not right The user name to login is wrong
Q18. - (Topic 3)
A user has configured Auto Scaling with 3 instances. The user had created a new AMI after updating one of the instances. If the user wants to terminate two specific instances to ensure that Auto Scaling launches an instances with the new launch configuration, which command should he run?
A. as-delete-instance-in-auto-scaling-group <Instance ID> --no-decrement-desired-capacity
B. as-terminate-instance-in-auto-scaling-group <Instance ID> --update-desired-capacity
C. as-terminate-instance-in-auto-scaling-group <Instance ID> --decrement-desired-capacity
D. as-terminate-instance-in-auto-scaling-group <Instance ID> --no-decrement-desired-capacity
Answer: D
Explanation:
The Auto Scaling command as-terminate-instance-in-auto-scaling-group <Instance ID> will terminate the specific instance ID. The user is required to specify the parameter as –no-decrement-desired-capacity to ensure that it launches a new instance from the launch config after terminating the instance. If the user specifies the parameter --decrement-desired-capacity then Auto Scaling will terminate the instance and decrease the desired capacity by 1.
Q19. - (Topic 3)
A user has created a VPC with the public subnet. The user has created a security group for that VPC. Which of the below mentioned statements is true when a security group is created?
A. It can connect to the AWS services, such as S3 and RDS by default
B. It will have all the inbound traffic by default
C. It will have all the outbound traffic by default
D. It will by default allow traffic to the internet gateway
Answer: C
Explanation:
A Virtual Private Cloud (VPC. is a virtual network dedicated to the user’s AWS account. AWS provides two features the user can use to increase security in VPC: security groups and network ACLs. Security groups work at the instance level while ACLs work at the subnet level. When a user creates a security group with AWS VPC, by default it will allow all the outbound traffic but block all inbound traffic.
Q20. - (Topic 2)
A user has launched an EBS backed instance. The user started the instance at 9 AM in the morning. Between 9 AM to 10 AM, the user is testing some script. Thus, he stopped the instance twice and restarted it. In the same hour the user rebooted the instance once. For how many instance hours will AWS charge the user?
A. 3 hours
B. 4 hours
C. 2 hours
D. 1 hour
Answer: A
Explanation:
A user can stop/start or reboot an EC2 instance using the AWS console, the Amazon EC2 CLI or the Amazon EC2 API. Rebooting an instance is equivalent to rebooting an operating system. When the instance is rebooted AWS will not charge the user for the extra hours. In case the user stops the instance, AWS does not charge the running cost but charges only the EBS storage cost. If the user starts and stops the instance multiple times in a single hour, AWS will charge the user for every start and stop. In this case, since the instance was rebooted twice, it will cost the user for 3 instance hours.