AWS-SysOps Amazon Exam Questions and Free Practice Test

Question 67

- (Topic 1)
Which of the following requires a custom CloudWatch metric to monitor?

A. Data transfer of an EC2 instance

B. Disk usage activity of an EC2 instance

C. Memory Utilization of an EC2 instance

D. CPU Utilization of an EC2 instance

Correct Answer:C
Reference:
http://aws.amazon.com/cloudwatch/

Question 68

- (Topic 3)
A user has setup a custom application which generates a number in decimals. The user wants to track that number and setup the alarm whenever the number is above a certain limit. The application is sending the data to CloudWatch at regular intervals for this purpose. Which of the below mentioned statements is not true with respect to the above scenario?

A. The user can get the aggregate data of the numbers generated over a minute and send it to CloudWatch

B. The user has to supply the timezone with each data point

C. CloudWatch will not truncate the number until it has an exponent larger than 126 (i.

D. (1 x 10^126.

E. The user can create a file in the JSON format with the metric name and value and supply it to CloudWatch

Correct Answer:B

Question 69

- (Topic 2)
A user has created a VPC with CIDR 20.0.0.0/24. The user has created a public subnet with CIDR 20.0.0.0/25 and a private subnet with CIDR 20.0.0.128/25. The user has launched one instance each in the private and public subnets. Which of the below mentioned options cannot be the correct IP address (private IP. assigned to an instance in the public or private subnet?

A. 20.0.0.255

B. 20.0.0.132

C. 20.0.0.122

D. 20.0.0.55

Correct Answer:A

When the user creates a subnet in VPC, he specifies the CIDR block for the subnet. In this case the user has created a VPC with the CIDR block 20.0.0.0/24, which supports 256 IP addresses (20.0.0.0 to 20.0.0.255.. The public subnet will have IP addresses between 20.0.0.0 - 20.0.0.127 and the private subnet will have IP addresses between 20.0.0.128 -20.0.0.255. AWS reserves the first four IP addresses and the last IP address in each subnet’s CIDR block. These are not available for the user to use. Thus, the instance cannot have an IP address of 20.0.0.255

Question 70

- (Topic 3)
A user is observing the EC2 CPU utilization metric on CloudWatch. The user has observed some interesting patterns while filtering over the 1 week period for a particular hour. The user wants to zoom that data point to a more granular period. How can the user do that easily with CloudWatch?

A. The user can zoom a particular period by selecting that period with the mouse and then releasing the mouse

B. The user can zoom a particular period by double clicking on that period with the mouse

C. The user can zoom a particular period by specifying the aggregation data for that period

D. The user can zoom a particular period by specifying the period in the Time Range

Correct Answer:A

Question 71

- (Topic 3)
An organization has setup Auto Scaling with ELB. Due to some manual error, one of the instances got
rebooted. Thus, it failed the Auto Scaling health check. Auto Scaling has marked it for replacement. How can the system admin ensure that the instance does not get terminated?

A. Update the Auto Scaling group to ignore the instance reboot event

B. It is not possible to change the status once it is marked for replacement

C. Manually add that instance to the Auto Scaling group after reboot to avoid replacement

D. Change the health of the instance to healthy using the Auto Scaling commands

Correct Answer:D

After an instance has been marked unhealthy by Auto Scaling, as a result of an Amazon EC2 or ELB health check, it is almost immediately scheduled for replacement as it will never automatically recover its health. If the user knows that the instance is healthy then he can manually call the SetInstanceHealth action (or the as-setinstance- health command from CLI. to set the instance's health status back to healthy. Auto Scaling will throw an error if the instance is already terminating or else it will mark it healthy.

Question 72

- (Topic 2)
A user has configured ELB with two EBS backed EC2 instances. The user is trying to understand the DNS access and IP support for ELB. Which of the below mentioned statements may not help the user understand the IP mechanism supported by ELB?

A. The client can connect over IPV4 or IPV6 using Dualstack

B. ELB DNS supports both IPV4 and IPV6

C. Communication between the load balancer and back-end instances is always through IPV4

D. The ELB supports either IPV4 or IPV6 but not both

Correct Answer:D

Elastic Load Balancing supports both Internet Protocol version 6 (IPv6. and Internet Protocol version 4 (IPv4.. Clients can connect to the user’s load balancer using either IPv4 or IPv6 (in EC2-Classic. DNS. However, communication between the load balancer and its back-end instances uses only IPv4. The user can use the Dualstack-prefixed DNS name to enable IPv6 support for communications between the client and the load balancers. Thus, the clients are able to access the load balancer using either IPv4 or IPv6 as their individual connectivity needs dictate.

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