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Q71. A user has launched five instances with ELB. How can the user add the sixth EC2 instance to ELB?

A. The user can add the sixth instance on the fly.

B. The user must stop the ELB and add the sixth instance.

C. The user can add the instance and change the ELB config file.

D. The ELB can only have a maximum of five instances. 

Answer: A

Explanation:

Elastic Load Balancing automatically distributes incoming traffic across multiple EC2 instances. You create a load balancer and register instances with the load balancer in one or more Availability Zones. The load balancer serves as a single point of contact for clients. This enables you to increase the availability of your application. You can add and remove EC2 instances from your load balancer as your needs change, without disrupting the overall flow of information.

Reference:        http://docs.aws.amazon.com/E|asticLoadBaIancing/latest/DeveIoperGuide/Svclntro.htm|

Q72. Can one instance be registered with two ELBs in the same region?

A. No

B. Yes, provided both ELBs have the same health check configuration

C. Yes, always

D. Yes, provided both ELBs are in the same AZ 

Answer: C

Explanation:

Yes, it is possible to have one instance part of two separate ELBs, though both ELBs have different configurations. ELBs are never launched in specific zones.

Reference:

http://docs.aws.amazon.com/EIasticLoadBaIancing/latest/DeveIoperGuide/enable-disable-az.html

Q73. A user has configured ELB. Which of the below mentioned protocols the user can configure for ELB health checks while setting up ELB?

A. All of the options

B. TCP

C. HTTPS

D. SSL

Answer:

Explanation:

An ELB performs a health check on its instances to ensure that it diverts traffic only to healthy instances. The ELB can perform a health check on HTTP, HTTPS, TCP and SSL protocols.

Reference:        http://docs.aws.amazon.com/EIasticLoadBaIancing/latest/Deve|operGuide/Welcome.html

Q74. Which of the below mentioned options is not a best practice to securely manage the AWS access credentials?

A. Enable MFA for prMleged users

B. Create indMdual IAM users

C. Keep rotating your secure access credentials at regular intervals

D. Create strong access key and secret access key and attach to the root account 

Answer: D

Explanation:

It is a recommended approach to avoid using the access and secret access keys of the root account.

Thus, do not download or delete it. Instead make the IAM user as powerful as the root account and use its credentials. The user cannot generate their own access and secret access keys as they are always  generated by AWS.

Reference:       http://docs.aws.amazon.com/IAM/latest/UserGuide/IAMBestPractices.html

Q75. What is the data model of DynamoDB?

A. "Items", with Keys and one or more Attribute; and "Attribute", with Name and Value.

B. "Database", which is a set of "TabIes", which is a set of "Items", which is a set of "Attributes".

C. "TabIe", a collection of Items; "Items", with Keys and one or more Attribute; and "Attribute", with Name and Value.

D. "Database", a collection of Tables; "TabIes", with Keys and one or more Attribute; and "Attribute", with Name and Value.

Answer:

Explanation:

The data model of DynamoDB is: "TabIe", a collection of Items;

"Items", with Keys and one or more Attribute; "Attribute", with Name and Value.

Reference:        http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModeI.html

Q76. How does Amazon SQS allow multiple readers to access the same message queue without losing messages or processing them many times?

A. By identifying a user by his unique id

B. By using unique cryptography

C. Amazon SQS queue has a configurable visibility timeout.

D. MuItipIe readers can't access the same message queue 

Answer: C

Explanation:

Every Amazon SQS queue has a configurable visibility timeout. For the designated amount of time after a message is read from a queue, it will not be visible to any other reader. As long as the amount of time that it takes to process the message is less than the visibility timeout, every message will be processed and deleted. In the event that the component processing the message fails or becomes unavailable, the  message will again become visible to any component reading the queue once the visibility timeout ends. This allows you to have many components all reading messages from the same queue, with each working to process different messages.

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

Q77. A user has launched an RDS instance. The user has created 3 databases on the same server. What can the maximum size be for each database?

A. The size of each DB cannot be more than 3 TB

B. It is not possible to have more than one DB on a single instance

C. The total instance storage size cannot be more than 3 TB

D. The size of each DB cannot be more than 1 TB 

Answer: C

Explanation:

The AWS RDS DB instance is an isolated DB environment provided by AWS in which the user can create more than 1 database. The maximum size ofthe instance should be between 5 GB and 3 TB. The size of each DB can be anything in this range.

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

Q78. Which header received at the EC2 instance identifies the port used by the client while requesting ELB?

A. X-Forvvarded-Proto

B. X-Requested-Proto

C. X-Forvvarded-Port

D. X-Requested-Port 

Answer: C

Explanation:

The X-Forvvarded-Port request header helps the user identify the port used by the client while sending a request to ELB.

Reference: http://docs.aws.amazon.com/EIasticLoadBalancing/latest/DeveIoperGuide/TerminologyandKeyConcepts. html

Q79. In DynamoDB, the default table size is:

A. 5 GB

B. 1 GB

C. 10 GB

D. There is no table size 

Answer: D

Explanation:

DynamoDB has seamless scalability with no table size limits and unlimited storage, so you shouIdn't be worried about managing storage on the host or to provisioning more drive, as your data requirement changes.

Reference: http://aws.amazon.com/dynamodb/

Q80. A user has launched one EC2 instance in the US West region. The user wants to access the RDS instance launched in the US East region from that EC2 instance. How can the user configure the access for that EC2 instance?

A. It is not possible to access RDS of the US East region from the US West region

B. Open the security group of the US West region in the RDS security group’s ingress rule

C. Configure the IP range of the US West region instance as the ingress security rule of RDS

D. Create an IAM role which has access to RDS and launch an instance in the US West region with it 

Answer: C

Explanation:

The user cannot authorize an Amazon EC2 security group if it is in a different AWS Region than the RDS DB instance. The user can authorize an IP range or specify an Amazon EC2 security group in the same region that refers to an IP address in another region.

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

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