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Q271. My Read Replica appears "stuck" after a MuIti-AZ failover and is unable to obtain or apply updates from the source DB Instance. What do I do?

A. You will need to delete the Read Replica and create a new one to rep lace it.

B. You will need to disassociate the DB Engine and re associate it.

C. The instance should be deployed to Single AZ and then moved to MuIti- AZ once again

D. You will need to delete the DB Instance and create a new one to replace it. 

Answer: A


Q272. Having just set up your first Amazon Virtual Private Cloud (Amazon VPC) network, which defined a default network interface, you decide that you need to create and attach an additional network interface, known as an elastic network interface (ENI) to one of your instances. Which of the following statements is true regarding attaching network interfaces to your instances in your VPC?

A. You can attach 5 EN|s per instance type.

B. You can attach as many ENIs as you want.

C. The number of ENIs you can attach varies by instance type.

D. You can attach 100 ENIs total regardless of instance type. 

Answer: C

Explanation:

Each instance in your VPC has a default network interface that is assigned a private IP address from the   IP address range of your VPC. You can create and attach an additional network interface, known as an elastic network interface (ENI), to any instance in your VPC. The number of EN|s you can attach varies by instance type.


Q273. You need a persistent and durable storage to trace call actMty of an IVR (Interactive Voice Response) system. Call duration is mostly in the 2-3 minutes timeframe. Each traced call can be either active or terminated. An external application needs to know each minute the list of currently active calls, which are usually a few calls/second. Put once per month there is a periodic peak up to 1000 calls/second for a few hours. The system is open 24/7 and any downtime should be avoided.

Historical data is periodically archived to files. Cost saving is a priority for this project.

What database implementation would better fit this scenario, keeping costs as low as possible?

A. Use RDS Multi-AZ with two tables, one for -Active calls" and one for -Terminated ca Ils". In this way the "Active caIIs_ table is always small and effective to access.

B. Use DynamoDB with a "Calls" table and a Global Secondary Index on a "IsActive"' attribute that is present for active calls only In this way the Global Secondary index is sparse and more effective.

C. Use DynamoDB with a 'Calls" table and a Global secondary index on a 'State" attribute that can equal to "active" or "terminated" in this way the Global Secondary index can be used for all Items in the table.

D. Use RDS Multi-AZ with a "CALLS" table and an Indexed "STATE* field that can be equal to 'ACTIVE" or -TERMNATED" In this way the SOL query Is optimized by the use of the Index.

Answer: A


Q274. Changes to the backup window take effect _ _

A. from the next billing cycle

B. after 30 minutes

C. immediately

D. after 24 hours 

Answer: C


Q275. You have set up an Elastic Load Balancer (ELB) with the usual default settings, which route each request independently to the application instance with the smallest load. However, someone has asked you to bind a user's session to a specific application instance so as to ensure that all requests coming from the user during the session will be sent to the same application instance. AWS has a feature to do this. What is it called?

A. Connection draining

B. Proxy protocol

C. Tagging

D. Sticky session 

Answer: D

Explanation:

An Elastic Load BaIancer(ELB) by default, routes each request independently to the application instance

with the smallest load. However, you can use the sticky session feature (also known as session affinity), which enables the load balancer to bind a user's session to a specific application instance. This ensures that all requests coming from the user during the session will be sent to the same application instance.  The key to managing the sticky session is determining how long your load balancer should consistently route the user's request to the same application instance. If your application has its own session cookie, then you can set Elastic Load Balancing to create the session cookie to follow the duration specified by the appIication's session cookie. If your application does not have its own session cookie, then you can  set Elastic Load Balancing to create a session cookie by specifying your own stickiness duration. You can associate stickiness duration for only HTTP/HTTPS load balancer listeners.

An application instance must always receive and send two cookies: A cookie that defines the stickiness duration and a special Elastic Load Balancing cookie named AWSELB, that has the mapping to the application instance.

Reference: http://docs.aws.amazon.com/E|asticLoadBaIancing/latest/DeveIoperGuide/TerminoIogyandKeyConcepts. htmI#session-stickiness


Q276. When automatic failover occurs, Amazon RDS will emit a DB Instance event to inform you that automatic failover occurred. You can use the to ret urn information about events related to your DB Instance

A. FetchFai|ure

B. DescriveFai|ure

C. DescribeEvents

D. FetchEvents 

Answer: C


Q277. A user is aware that a huge download is occurring on his instance. He has already set the Auto Scaling policy to increase the instance count when the network I/O increases beyond a certain limit. How can the user ensure that this temporary event does not result in scaling?

A. The network I/O are not affected during data download

B. The policy cannot be set on the network I/O

C. There is no way the user can stop scaling as it is already configured

D. Suspend scaling 

Answer: D

Explanation:

The user may want to stop the automated scaling processes on the Auto Scaling groups either to perform manual operations or during emergency situations. To perform this, the user can suspend one or more scaling processes at any time. Once it is completed, the user can resume all the suspended processes. Reference:http://docs.aws.amazon.com/AutoScaIing/latest/Deve|operGuide/AS_Concepts.htmI


Q278. You need to migrate a large amount of data into the cloud that you have stored on a hard disk and you decide that the best way to accomplish this is with AWS Import/Export and you mail the hard disk to AWS. Which of the following statements is incorrect in regards to AWS Import/Export?

A. It can export from Amazon S3

B. It can Import to Amazon Glacier

C. It can export from Amazon Glacier.

D. It can Import to Amazon EBS 

Answer: C

Explanation:

AWS Import/Export supports: Import to Amazon S3

Export from Amazon S3 Import to Amazon EBS Import to Amazon Glacier

AWS Import/Export does not currently support export from Amazon EBS or Amazon Glacier. Reference: https://docs.aws.amazon.com/AWSImportExport/Iatest/DG/whatisdisk.html


Q279. Which of the following statements is true of creating a launch configuration using an EC2 instance?

A. The launch configuration can be created only using the Query APIs.

B. Auto Scaling automatically creates a launch configuration directly from an EC2 instance.

C. A user should manually create a launch configuration before creating an Auto Scaling group.

D. The launch configuration should be created manually from the AWS CLI. 

Answer: B

Explanation:

You can create an Auto Scaling group directly from an EC2 instance. When you use this feature, Auto Scaling automatically creates a launch configuration for you as well.

Reference:

http://docs.aws.amazon.com/AutoScaling/latest/DeveIoperGuide/create-Ic-with-instancelD.htmI


Q280. After deploying a new website for a client on AWS, he asks if you can set it up so that if it fails it can be automatically redirected to a backup website that he has stored on a dedicated server elsewhere. You are wondering whether Amazon Route 53 can do this. Which statement below is correct in regards to Amazon Route 53?

A. Amazon Route 53 can't help detect an outage. You need to use another service.

B. Amazon Route 53 can help detect an outage of your website and redirect your end users to alternate locations.

C. Amazon Route 53 can help detect an outage of your website but can't redirect your end users to alternate locations.

D. Amazon Route 53 can't help detect an outage of your website, but can redirect your end users to alternate locations.

Answer: B 

Explanation:

With DNS Failover, Amazon Route 53 can help detect an outage of your website and redirect your end users to alternate locations where your application is operating properly.

Reference:

http://aws.amazon.com/about-aws/whats-new/2013/02/11/announcing-dns-faiIover-for-route-53/