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Q89. - (Topic 2) 

A user has setup a web application on EC2. The user is generating a log of the application performance at every second. There are multiple entries for each second. If the user wants to send that data to CloudWatch every minute, what should he do? 

A. The user should send only the data of the 60th second as CloudWatch will map the receive data timezone with the sent data timezone 

B. It is not possible to send the custom metric to CloudWatch every minute 

C. Give CloudWatch the Min, Max, Sum, and SampleCount of a number of every minute 

D. Calculate the average of one minute and send the data to CloudWatch 

Answer: C 

Explanation: 

Amazon CloudWatch aggregates statistics according to the period length that the user has specified while getting data from CloudWatch. The user can publish as many data points as he wants with the same or similartime stamps. CloudWatch aggregates them by the period length when the user calls get statistics about those data points. CloudWatch records the average (sum of all items divided by the number of items. of the values received for every 1-minute period, as well as the number of samples, maximum value, and minimum value for the same time period. CloudWatch will aggregate all the data which have time stamps within a one-minute period. 


Q90. - (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: B 

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. 


Q91. - (Topic 3) 

A sysadmin has created the below mentioned policy on an S3 bucket named cloudacademy. What does this policy define? 

"Statement": [{ 

"Sid": "Stmt1388811069831", 

"Effect": "Allow", 

"Principal": { "AWS": "*"}, 

"Action": [ "s3:GetObjectAcl", "s3:ListBucket"], 

"Resource": [ "arn:aws:s3:::cloudacademy] 

}] 

A. It will make the cloudacademy bucket as well as all its objects as public 

B. It will allow everyone to view the ACL of the bucket 

C. It will give an error as no object is defined as part of the policy while the action defines the rule about the object 

D. It will make the cloudacademy bucket as public 

Answer: D 

Explanation: 

A sysadmin can grant permission to the S3 objects or the buckets to any user or make objects public using the bucket policy and user policy. Both use the JSON-based access policy language. Generally if the user is defining the ACL on the bucket, the objects in the bucket do not inherit it and vice a versa. The bucket policy can be defined at the bucket level which allows the objects as well as the bucket to be public with a single policy applied to that bucket. In the sample policy the action says “S3:ListBucket” for effect Allow on 

Resource arn:aws:s3:::cloudacademy. This will make the cloudacademy bucket public. 

"Statement": [{ 

"Sid": "Stmt1388811069831", 

"Effect": "Allow", 

"Principal": { "AWS": "*" }, 

"Action": [ "s3:GetObjectAcl", "s3:ListBucket"], 

"Resource": [ "arn:aws:s3:::cloudacademy] 

}] 


Q92. - (Topic 2) 

A user is planning to setup notifications on the RDS DB for a snapshot. Which of the below mentioned event categories is not supported by RDS for this snapshot source type? 

A. Backup 

B. Creation 

C. Deletion 

D. Restoration 

Answer: A 

Explanation: 

Amazon RDS uses the Amazon Simple Notification Service to provide a notification when an Amazon RDS event occurs. Event categories for a snapshot source type include: Creation, Deletion, and Restoration. The Backup is a part of DB instance source type. 


Q93. - (Topic 3) 

What would happen to an RDS (Relational Database Service) multi-Availability Zone deployment if the primary DB instance fails? 

A. The IP of the primary DB Instance is switched to the standby DB Instance. 

B. A new DB instance is created in the standby availability zone. 

C. The canonical name record (CNAME) is changed from primary to standby. 

D. The RDS (Relational Database Service) DB instance reboots. 

Answer: D 

Explanation: Reference: 

http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_RebootInstance.html 


Q94. - (Topic 1) 

You are using ElastiCache Memcached to store session state and cache database queries in your infrastructure. You notice in CloudWatch that Evictions and GetMisses are Doth very high. 

What two actions could you take to rectify this? 

Choose 2 answers 

A. Increase the number of nodes in your cluster 

B. Tweak the max_item_size parameter 

C. Shrink the number of nodes in your cluster 

D. Increase the size of the nodes in the duster 

Answer: B,D 


Q95. - (Topic 2) 

You are building an online store on AWS that uses SQS to process your customer orders. Your backend system needs those messages in the same sequence the customer orders have been put in. How can you achieve that? 

A. It is not possible to do this with SQS 

B. You can use sequencing information on each message 

C. You can do this with SQS but you also need to use SWF 

D. Messages will arrive in the same order by default 

Answer: B 

Explanation: 

Amazon SQS is engineered to always be available and deliver messages. One of the resulting tradeoffs is that SQSdoes not guarantee first in, first out delivery of messages. For many distributed applications, each message can stand on its own, and as long as all messages are delivered, the order is not important. If your system requires that order be preserved, you can place sequencing information in each message, so that you can reorder the messages when the queue returns them. 


Q96. - (Topic 3) 

A user is receiving a notification from the RDS DB whenever there is a change in the DB security group. The user does not want to receive these notifications for only a month. Thus, he does not want to delete the notification. How can the user configure this? 

A. Change the Disable button for notification to “Yes” in the RDS console 

B. Set the send mail flag to false in the DB event notification console 

C. The only option is to delete the notification from the console 

D. Change the Enable button for notification to “No” in the RDS console 

Answer: D 

Explanation: 

Amazon RDS uses the Amazon Simple Notification Service to provide a notification when an Amazon RDS event occurs. Event notifications are sent to the addresses that the user has provided while creating the subscription. The user can easily turn off the notification without deleting a subscription by setting the Enabled radio button to No in the Amazon RDS console or by setting the Enabled parameter to false using the CLI or Amazon RDS API.