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July 30, 2017

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Q51. - (Topic 3) 

An organization has configured Auto Scaling with ELB. One of the instance health check returns the status as Impaired to Auto Scaling. What will Auto Scaling do in this scenario? 

A. Perform a health check until cool down before declaring that the instance has failed 

B. Terminate the instance and launch a new instance 

C. Notify the user using SNS for the failed state 

D. Notify ELB to stop sending traffic to the impaired instance 

Answer:

Explanation: 

The Auto Scaling group determines the health state of each instance periodically by checking the results of the Amazon EC2 instance status checks. If the instance status description shows any other state other than “running” or the system status description shows impaired, Auto Scaling considers the instance to be unhealthy. Thus, it terminates the instance and launches a replacement. 


Q52. - (Topic 3) 

A user has created a public subnet with VPC and launched an EC2 instance within it. The user is trying to 

delete the subnet. What will happen in this scenario? 

A. It will delete the subnet and make the EC2 instance as a part of the default subnet 

B. It will not allow the user to delete the subnet until the instances are terminated 

C. It will delete the subnet as well as terminate the instances 

D. The subnet can never be deleted independently, but the user has to delete the VPC first 

Answer:

Explanation: 

A Virtual Private Cloud (VPC. is a virtual network dedicated to the user’s AWS account. A user can create a subnet with VPC and launch instances inside that subnet. When an instance is launched it will have a network interface attached with it. The user cannot delete the subnet until he terminates the instance and deletes the network interface. 


Q53. - (Topic 2) 

A user has enabled detailed CloudWatch metric monitoring on an Auto Scaling group. Which of the below 

mentioned metrics will help the user identify the total number of instances in an Auto Scaling group cluding pending, terminating and running instances? 

A. GroupTotalInstances 

B. GroupSumInstances 

C. It is not possible to get a count of all the three metrics together. The user has to find the individual number of running, terminating and pending instances and sum it 

D. GroupInstancesCount 

Answer:

Explanation: 

CloudWatch is used to monitor AWS as well as the custom services. For Auto Scaling, CloudWatch provides various metrics to get the group information, such as the Number of Pending, Running or Terminating instances at any moment. If the user wants to get the total number of Running, Pending and Terminating instances at any moment, he can use the GroupTotalInstances metric. 


Q54. - (Topic 2) 

An organization has setup consolidated billing with 3 different AWS accounts. Which of the below mentioned advantages will organization receive in terms of the AWS pricing? 

A. The consolidated billing does not bring any cost advantage for the organization 

B. All AWS accounts will be charged for S3 storage by combining the total storage of each account 

C. The EC2 instances of each account will receive a total of 750*3 micro instance hours free 

D. The free usage tier for all the 3 accounts will be 3 years and not a single year 

Answer:

Explanation: 

AWS consolidated billing enables the organization to consolidate payments for multiple Amazon Web Services (AWS. accounts within a single organization by making a single paying account. For billing purposes, AWS treats all the accounts on the consolidated bill as one account. Some services, such as Amazon EC2 and Amazon S3 have volume pricing tiers across certain usage dimensions that give the user lower prices when he uses the service more. 


Q55. - (Topic 3) 

You run a web application with the following components Elastic Load Balancer (EL8), 3 Web/Application servers, 1 MySQL RDS database with read replicas, and Amazon Simple Storage Service (Amazon S3) for static content. Average response time for users is increasing slowly. 

What three CloudWatch RDS metrics will allow you to identify if the database is the bottleneck? Choose 3 answers 

A. The number of outstanding IOs waiting to access the disk. 

B. The amount of write latency. 

C. The amount of disk space occupied by binary logs on the master. 

D. The amount of time a Read Replica DB Instance lags behind the source DB Instance 

E. The average number of disk I/O operations per second. 

Answer: A,B,D 


Q56. - (Topic 1) 

An organization has configured a VPC with an Internet Gateway (IGW). pairs of public and 

private subnets (each with one subnet per Availability Zone), and an Elastic Load Balancer (ELB) configured to use the public subnets The application s web tier leverages the ELB. Auto Scaling and a mum-AZ RDS database instance The organization would like to eliminate any potential single points ft failure in this design. 

What step should you take to achieve this organization's objective? 

A. Nothing, there are no single points of failure in this architecture. 

B. Create and attach a second IGW to provide redundant internet connectivity. 

C. Create and configure a second Elastic Load Balancer to provide a redundant load balancer. 

D. Create a second multi-AZ RDS instance in another Availability Zone and configure replication to provide a redundant database. 

Answer:


Q57. - (Topic 3) 

A user has configured an ELB to distribute the traffic among multiple instances. The user instances are facing some issues due to the back-end servers. Which of the below mentioned CloudWatch metrics helps the user understand the issue with the instances? 

A. HTTPCode_Backend_3XX 

B. HTTPCode_Backend_4XX 

C. HTTPCode_Backend_2XX 

D. HTTPCode_Backend_5XX 

Answer:

Explanation: 

CloudWatch is used to monitor AWS as well as the custom services. For ELB, CloudWatch provides various metrics including error code by ELB as well as by back-end servers (instances.. It gives data for the count of the number of HTTP response codes generated by the back-end instances. This metric does not include any response codes generated by the load balancer. These metrics are: The 2XX class status codes represents successful actions The 3XX class status code indicates that the user agent requires action The 4XX class status code represents client errors 

The 5XX class status code represents back-end server errors 


Q58. - (Topic 2) 

A user has setup connection draining with ELB to allow in-flight requests to continue while the instance is being deregistered through Auto Scaling. If the user has not specified the draining time, how long will ELB allow inflight requests traffic to continue? 

A. 600 seconds 

B. 3600 seconds 

C. 300 seconds 

D. 0 seconds 

Answer:

Explanation: 

The Elastic Load Balancer connection draining feature causes the load balancer to stop sending new requests to the back-end instances when the instances are deregistering or become unhealthy, while ensuring that inflight requests continue to be served. The user can specify a maximum time (3600 seconds. for the load balancer to keep the connections alive before reporting the instance as deregistered. If the user does not specify the maximum timeout period, by default, the load balancer will close the connections to the deregistering instance after 300 seconds. 


Q59. - (Topic 3) 

A user has created a VPC with CIDR 20.0.0.0/24. The user has used all the IPs of CIDR and wants to increase the size of the VPC. The user has two subnets: public (20.0.0.0/28. and private (20.0.1.0/28.. How can the user change the size of the VPC? 

A. The user can delete all the instances of the subnet. Change the size of the subnets to 20.0.0.0/32 and 20.0.1.0/32, respectively. Then the user can increase the size of the VPC using CLI 

B. It is not possible to change the size of the VPC once it has been created 

C. The user can add a subnet with a higher range so that it will automatically increase the size of the VPC 

D. The user can delete the subnets first and then modify the size of the VPC 

Answer:

Explanation: 

Once the user has created a VPC, he cannot change the CIDR of that VPC. The user has to terminate all the instances, delete the subnets and then delete the VPC. Create a new VPC with a higher size and launch instances with the newly created VPC and subnets. 


Q60. - (Topic 2) 

A user has configured CloudWatch monitoring on an EBS backed EC2 instance. If the user has not attached any additional device, which of the below mentioned metrics will always show a 0 value? 

A. DiskReadBytes 

B. NetworkIn 

C. NetworkOut 

D. CPUUtilization 

Answer:

Explanation: 

CloudWatch is used to monitor AWS as the well custom services. For EC2 when the user is monitoring the EC2 instances, it will capture the 7 Instance level and 3 system check parameters for the EC2 instance. Since this is an EBS backed instance, it will not have ephermal storage attached to it. Out of the 7 EC2 metrics, the 4 metrics DiskReadOps, DiskWriteOps, DiskReadBytes and DiskWriteBytes are disk related data and available only when there is ephermal storage attached to an instance. For an EBS backed instance without any additional device, this data will be 0. 



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