AWS云计算助理架构师考试题库,英文,

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Question: 1

You are trying to launch an EC2 instance, however the instance seems to go into a terminated status immediately. What would probably not be a reason that this is happening?

A.The AMI is missing a required part.

B.The snapshot is corrupt.

C.You need to create storage in EBS first.

D.You’ve reached your volume limit.

 

 

 

 

Answer: C

Explanation:

Amazon EC2 provides a virtual computing environments, known as an instance.

After you launch an instance, AWS recommends that you check its status to confirm that it goes from the pending status to the running status, the not terminated status.

The following are a few reasons why an Amazon EBS-backed instance might immediately terminate:

You’ve reached your volume limit. The AMI is missing a required part. The snapshot is corrupt.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_InstanceStraightToTerminat ed.html

 

 

 

 

Question: 2

You have set up an Auto Scaling group. The cool down period for the Auto Scaling group is 7 minutes. The first instance is launched after 3 minutes, while the second instance is launched after 4 minutes. How many minutes after the first instance is launched will Auto Scaling accept another scaling activity request?

A.11 minutes

B.7 minutes

C.10 minutes

D.14 minutes

 

 

 

 

Answer: A

Explanation:

If an Auto Scaling group is launching more than one instance, the cool down period for each instance starts after that instance is launched. The group remains locked until the last instance that was launched has completed its cool down period. In this case the cool down period for the first instance starts after 3 minutes and finishes at the 10th minute (3+7 cool down), while for the second instance it starts at the 4th minute and finishes at the 11th minute (4+7 cool down). Thus, the Auto Scaling group will receive another request only after 11 minutes.

Reference: http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AS_Concepts.html

 

 

 

 

Question: 3

In Amazon EC2 Container Service components, what is the name of a logical grouping of container instances on which you can place tasks?

A.A cluster

B.A container instance

C.A container

D.A task definition

 

 

 

 

Answer: A

Explanation:

Amazon ECS contains the following components:

A Cluster is a logical grouping of container instances that you can place tasks on.

A Container instance is an Amazon EC2 instance that is running the Amazon ECS agent and has been registered into a cluster.

A Task definition is a description of an application that contains one or more container definitions.

A Scheduler is the method used for placing tasks on container instances.

A Service is an Amazon ECS service that allows you to run and maintain a specified number of instances of a task definition simultaneously.

A Task is an instantiation of a task definition that is running on a container instance. A Container is a Linux container that was created as part of a task.

Reference: http://docs.aws.amazon.com/AmazonECS/latest/developerguide/Welcome.html

 

 

 

 

Question: 4

In the context of AWS support, why must an EC2 instance be unreachable for 20 minutes rather than allowing customers to open tickets immediately?

A.Because most reachability issues are resolved by automated processes in less than 20 minutes

?B.Because all EC2 instances are unreachable for 20 minutes every day when AWS does routine maintenance

C.Because all EC2 instances are unreachable for 20 minutes when first launched

D.Because of all the reasons listed here

 

 

 

 

Answer: A

Explanation:

An EC2 instance must be unreachable for 20 minutes before opening a ticket, because most reachability issues are resolved by automated processes in less than 20 minutes and will not require any action on the part of the customer. If the instance is still unreachable after this time frame has passed, then you should open a case with support.

Reference: https://aws.amazon.com/premiumsupport/faqs/

 

 

 

 

Question: 5

Can a user get a notification of each instance start / terminate configured with Auto Scaling?

A.Yes, if configured with the Launch Config

B.Yes, always

C.Yes, if configured with the Auto Scaling group

D.No

 

 

 

 

Answer: C

Explanation:

The user can get notifications using SNS if he has configured the notifications while creating the Auto Scaling group.

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