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Q251. What happens when you create a topic on Amazon SNS?

A. The topic is created, and it has the name you specified for it.

B. An ARN (Amazon Resource Name) is created.

C. You can create a topic on Amazon SQS, not on Amazon SNS.

D. This QUESTION  doesn't make sense. 

Answer: B

Q252. Your firm has uploaded a large amount of aerial image data to 53 In the past, in your on-premises environment, you used a dedicated group of servers to oaten process this data and used Rabbit MOAn open source messaging system to get job information to the servers. Once processed the data would go  to tape and be shipped offsite. Your manager told you to stay with the current design, and leverage AWS archival storage and messaging services to minimize cost. Which is correct?

A. Use SOS for passing job messages use Cloud Watch alarms to terminate EC2 worker instances when they become idle. Once data is processed, change the storage class of the 53 objects to Reduced Redundancy Storage.

B. Setup Auto-Scaled workers triggered by queue depth that use spot instances to process messages in SOS Once data is processed,

C. Change the storage class of the 53 objects to Reduced Redundancy Storage. Setup Auto-Scaled workers triggered by queue depth that use spot instances to process messages in SOS Once data is processed, change the storage class of the 53 objects to Glacier.

D. Use SNS to pass job messages use Cloud Watch alarms to terminate spot worker instances when they become idle. Once data is processed, change the storage class of the 53 object to Glacier.

Answer: D

Q253. After an Amazon VPC instance is launched, can I change the VPC security groups it belongs to?

A. Only if the tag "VPC_Change_Group" is true

B. Yes. You can.

C. No. You cannot.

D. Only if the tag "VPC Change Group" is true 

Answer: B

Q254. In Amazon EC2 Container Service, are other container types supported?

A. Yes, EC2 Container Service supports any container service you need.

B. Yes, EC2 Container Service also supports Microsoft container service.

C. No, Docker is the only container platform supported by EC2 Container Service presently.

D. Yes, EC2 Container Service supports Microsoft container service and Openstack. 

Answer: C

Explanation:

In Amazon EC2 Container Service, Docker is the only container platform supported by EC2 Container Service presently.

Reference: http://aws.amazon.com/ecs/faqs/

Q255. A user is observing the EC2 CPU utilization metric on CIoudWatch. 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 CIoudWatch?

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 specifying the aggregation data for that period

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

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

Answer: A

Explanation:

Amazon CIoudWatch provides the functionality to graph the metric data generated either by the AWS services or the custom metric to make it easier for the user to analyse. The AWS CIoudWatch console provides the option to change the granularity of a graph and zoom in to see data over a shorter time period. To zoom, the user has to click in the graph details pane, drag on the graph area for selection, and then release the mouse button.

Reference: http://docs.aws.amazon.com/AmazonCloudWatch/Iatest/Deve|operGuide/zoom_in_on_graph.htmI

Q256. Your company plans to host a large donation website on Amazon Web Services (AWS). You anticipate a large and undetermined amount of traffic that will create many database writes. To be certain that you do not drop any writes to a database hosted on AWS. Which service should you use?

A. Amazon RDS with provisioned IOPS up to the anticipated peak write throughput.

B. Amazon Simple Queue Service (SOS) for capturing the writes and draining the queue to write to the database.

C. Amazon EIastiCache to store the writes until the writes are committed to the database.

D. Amazon DynamoDB with provisioned write throughput up to the anticipated peak write throughput. 

Answer: B

Explanation:

Amazon Simple Queue Service (Amazon SQS) offers a reliable, highly scalable hosted queue for storing messages as they travel between computers. By using Amazon SQS, developers can simply move data between distributed application components performing different tasks, without losing messages or requiring each component to be always available. Amazon SQS makes it easy to build a distributed, decoupled application, working in close conjunction with the Amazon Elastic Compute Cloud (Amazon EC2) and the other AWS infrastructure web services.

What can I do with Amazon SQS?

Amazon SQS is a web service that gives you access to a message queue that can be used to store messages while waiting for a computer to process them. This allows you to quickly build message queuing applications that can be run on any computer on the internet. Since Amazon SQS is highly scalable and you only pay for what you use, you can start small and grow your application as you wish, with no compromise on performance or reliability. This lets you focus on building sophisticated message-based applications, without worrying about how the messages are stored and managed.

You can use Amazon SQS with software applications in various ways. For example, you can: Integrate Amazon SQS with other AWS infrastructure web services to make applications more reliable and filexible.

Use Amazon SQS to create a queue of work where each message is a task that needs to be completed by a process. One or many computers can read tasks from the queue and perform them. Build a microservices architecture, using queues to connect your microservices.

Keep notifications of significant events in a business process in an Amazon SQS queue. Each event can have a corresponding message in a queue, and applications that need to be aware of the event can read and process the messages.

Q257. You have a periodic Image analysis application that gets some files In Input analyzes them and tor each file writes some data in output to a ten file the number of files in input per day is high and concentrated in a few hours of the day.

Currently you have a server on EC2 with a large EBS volume that hosts the input data and the results it takes almost 20 hours per day to complete the process

What services could be used to reduce the elaboration time and improve the availability of the solution?

A. 53 to store 1/0 files. SOS to distribute elaboration commands to a group of hosts working in parallel. Auto scaling to dynamically size the group of hosts depending on the length of the SOS queue

B. EBS with Provisioned IOPS (PIOPS) to store 1/0 files. SNS to distribute elaboration commands to a group of hosts working in parallel Auto Scaling to dynamically size the group of hosts depending on the number of SNS notifications

C. 53 to store 1/0 files, SNS to distribute evaporation commands to a group of hosts working in parallel. Auto scaling to dynamically size the group of hosts depending on the number of SNS notifications

D. EBS with Provisioned IOPS (PIOPS) to store 1/0 files SOS to distribute elaboration commands to a group of hosts working in parallel Auto Scaling to dynamically size the group ot hosts depending on the length of the SOS queue.

Answer: D

Explanation:

Amazon EBS allows you to create storage volumes and attach them to Amazon EC2 instances. Once attached, you can create a file system on top of these volumes, run a database, or use them in any other   way you would use a block device. Amazon EBS volumes are placed in a specific Availability Zone, where they are automatically replicated to protect you from the failure of a single component.

Amazon EBS provides three volume types: General Purpose (SSD), Provisioned IOPS (SSD), and Magnetic. The three volume types differ in performance characteristics and cost, so you can choose the right storage performance and price for the needs of your applications. All EBS volume types offer the same durable snapshot capabilities and are designed for 99.999% availability.

Q258. While performing the volume status checks, if the status is insufficient-data, what does it mean?

A. the checks may still be in progress on the volume

B. the check has passed

C. the check has failed 

Answer: A

Q259. Your customer is willing to consolidate their log streams (access logs application logs security logs etc.) in one single system. Once consolidated, the customer wants to analyze these logs in real time based on heuristics. From time to time, the customer needs to validate heuristics, which requires going back to data samples extracted from the last 12 hours?

What is the best approach to meet your customer's requirements?

A. Send all the log events to Amazon SQS. Setup an Auto Scaling group of EC2 sewers to consume the logs and apply the heuristics.

B. Send all the log events to Amazon Kinesis develop a client process to apply heuristics on the logs

C. Configure Amazon Cloud Trail to receive custom logs, use EMR to apply heuristics the logs

D. Setup an Auto Scaling group of EC2 syslogd servers, store the logs on 53 use EMR to apply heuristics on the logs

Answer:

Explanation:

The throughput of an Amazon Kinesis stream is designed to scale without limits via increasing the number of shards within a stream. However, there are certain limits you should keep in mind while using Amazon Kinesis Streams:

By default, Records of a stream are accessible for up to 24 hours from the time they are added to the stream. You can raise this limit to up to 7 days by enabling extended data retention.

The maximum size of a data blob (the data payload before Base64-encoding) within one record is 1 megabyte (MB).

Each shard can support up to 1000 PUT records per second.

For more information about other API level limits, see Amazon Kinesis Streams Limits.

Q260. 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

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