AWS-SysOps Amazon Exam Questions and Free Practice Test

Question 25

- (Topic 2)
A user has created an ELB with three instances. How many security groups will ELB create by default?

A. 3

B. 5

C. 2

D. 1

Correct Answer:C

Elastic Load Balancing provides a special Amazon EC2 source security group that the user can use to ensure that back-end EC2 instances receive traffic only from Elastic Load Balancing. This feature needs two security groups: the source security group and a security group that defines the ingress rules for the back-end instances. To ensure that traffic only flows between the load balancer and the back-end instances, the user can add or modify a rule to the back-end security group which can limit the ingress traffic. Thus, it can come only from the source security group provided by Elastic load Balancing.

Question 26

- (Topic 2)
A user has launched an EBS backed EC2 instance. What will be the difference while performing the restart or stop/start options on that instance?

A. For restart it does not charge for an extra hour, while every stop/start it will be charged as a separate hour

B. Every restart is charged by AWS as a separate hour, while multiple start/stop actions during a single hour will be counted as a single hour

C. For every restart or start/stop it will be charged as a separate hour

D. For restart it charges extra only once, while for every stop/start it will be charged as a separate hour

Correct Answer:A

For an EC2 instance launched with an EBS backed AMI, each time the instance state is changed from stop to start/ running, AWS charges a full instance hour, even if these transitions happen multiple times within a single hour. Anyway, rebooting an instance AWS does not charge a new instance billing hour.

Question 27

- (Topic 3)
A sys admin has enabled a log on ELB. Which of the below mentioned activities are not captured by the log?

A. Response processing time

B. Front end processing time

C. Backend processing time

D. Request processing time

Correct Answer:B

Elastic Load Balancing access logs capture detailed information for all the requests made to the load balancer. Each request will have details, such as client IP, request path, ELB IP, time, and latencies. The time will have information, such as Request Processing time, Backend Processing time and Response Processing time.

Question 28

- (Topic 1)
You are tasked with setting up a cluster of EC2 Instances for a NoSQL database. The database requires random read IO disk performance up to a 100,000 IOPS at 4KB block side per node.
Which of the following EC2 instances will perform the best for this workload?

A. A High-Memory Quadruple Extra Large (m2.4xlarge) with EBS-Optimized set to true and a PIOPs EBS volume

B. A Cluster Compute Eight Extra Large (cc2.8xlarge) using instance storage

C. High I/O Quadruple Extra Large (hi1.4xlarge) using instance storage

D. A Cluster GPU Quadruple Extra Large (cg1.4xlarge) using four separate 4000 PIOPS EBS volumes in a RAID 0 configuration

Correct Answer:C
Explanation: Reference:
http://aws.amazon.com/ec2/instance-types/

Question 29

- (Topic 3)
A user has launched an EC2 instance from an instance store backed AMI. If the user restarts the instance, what will happen to the ephermal storage data?

A. All the data will be erased but the ephermal storage will stay connected

B. All data will be erased and the ephermal storage is released

C. It is not possible to restart an instance launched from an instance store backed AMI

D. The data is preserved

Correct Answer:D

A user can 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. However, it is recommended that the user use Amazon EC2 to reboot the instance instead of running the operating system reboot command from the instance. When an instance launched from an instance store backed AMI is rebooted all the ephermal storage data is still preserved.

Question 30

- (Topic 1)
You have decided to change the Instance type for instances running In your application tier that are using Auto Scaling.
In which area below would you change the instance type definition?

A. Auto Scaling launch configuration

B. Auto Scaling group

C. Auto Scaling policy

D. Auto Scaling tags

Correct Answer:A
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/WhatIsAutoScaling.html

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