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August 19, 2017

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Q151. You require the ability to analyze a customer's clickstream data on a website so they can do behavioral analysis. Your customer needs to know what sequence of pages and ads their customer clicked on. This data will be used in real time to modify the page layouts as customers click through the site to increase stickiness and advertising click-through. Which option meets the requirements for captioning and analyzing this data?

A. Log clicks in weblogs by URL store to Amazon 53, and then analyze with Elastic MapReduce

B. Push web clicks by session to Amazon Kinesis and analyze behavior using Kinesis workers

C. Write click events directly to Amazon Redshift and then analyze with SQL

D. Publish web clicks by session to an Amazon SQS queue men periodically drain these events to Amazon RDS and analyze with sol

Answer:

Explanation:

Reference: http:/ /www.slideshare.net/AmazonWebServices/aws-webcast-introduction-to-amazon-kinesis


Q152. Amazon S3 allows you to set per-file permissions to grant read and/or write access. However you have decided that you want an entire bucket with 100 files already in it to be accessible to the public. You don't want to go through 100 files indMdually and set permissions. What would be the best way to do this?

A. Move the bucket to a new region

B. Add a bucket policy to the bucket.

C. Move the files to a new bucket.

D. Use Amazon EBS instead of S3 

Answer: B

Explanation:

Amazon S3 supports several mechanisms that give you filexibility to control who can access your data as well as how, when, and where they can access it. Amazon S3 provides four different access control mechanisms: AWS Identity and Access Management (IAM) policies, Access Control Lists (ACLs), bucket policies, and query string authentication. IAM enables organizations to create and manage multiple users under a single AWS account. With IAM policies, you can grant IAM users fine-grained control to your Amazon S3 bucket or objects. You can use ACLs to selectively add (grant) certain permissions on indMdual objects.

Amazon S3 bucket policies can be used to add or deny permissions across some or all of the objects within a single bucket.

With Query string authentication, you have the ability to share Amazon S3 objects through URLs that are

valid for a specified period of time.

Reference: http://aws.amazon.com/s3/detai|s/#security


Q153. If I write the below command, what does it do? ec2-run ami-e3a5408a -n 20 -g appserver

A. Start twenty instances as members of appserver group.

B. Creates 20 rules in the security group named appserver

C. Terminate twenty instances as members of appserver group.

D. Start 20 security groups 

Answer: A


Q154. After setting up an EC2 security group with a cluster of 20 EC2 instances, you find an error in the security group settings. You quickly make changes to the security group settings. When will the changes to the settings be effective?

A. The settings will be effective immediately for all the instances in the security group.

B. The settings will be effective only when all the instances are restarted.

C. The settings will be effective for all the instances only after 30 minutes.

D. The settings will be effective only for the new instances added to the security group. 

Answer: A

Explanation:

Amazon Redshift applies changes to a cluster security group immediately. So if you have associated the cluster security group with a cluster, inbound cluster access rules in the updated cluster security group apply immediately.

Reference:  http://docs.aws.amazon.com/redshift/latest/mgmt/working-with-security-groups.htm|


Q155. What does Amazon E|astiCache provide?

A. A senrice by this name doesn't exist. Perhaps you mean Amazon C|oudCache.

B. A virtual server with a huge amount of memory.

C. A managed In-memory cache service.

D. An Amazon EC2 instance with the Memcached software already pre-installed. 

Answer: C


Q156. A user is planning to make a mobile game which can be played online or offline and will be hosted on EC2.

The user wants to ensure that if someone breaks the highest score or they achieve some milestone they  can inform all their colleagues through email. Which of the below mentioned AWS services helps achieve this goal?

A. AWS Simple Workflow Service.

B. AWS Simple Email Service.

C. Amazon Cognito

D. AWS Simple Queue Service. 

Answer: B

Explanation:

Amazon Simple Email Service (Amazon SES) is a highly scalable and cost-effective email-sending service for businesses and developers. It integrates with other AWS services, making it easy to send emails from applications that are hosted on AWS.

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


Q157. When does the billing of an Amazon EC2 system begin?

A. It starts when the Status column for your distribution changes from Creating to Deployed.

B. It starts as soon as you click the create instance option on the main EC2 console.

C. It starts when your instance reaches 720 instance hours.

D. It starts when Amazon EC2 initiates the boot sequence of an AM instance. 

Answer: D

Explanation:

Billing commences when Amazon EC2 initiates the boot sequence of an AM instance. Billing ends when the instance terminates, which could occur through a web services command, by running "shutdown -h", or through instance failure. When you stop an instance, Amazon shuts it down but doesn/Et charge hourly usage for a stopped instance, or data transfer fees, but charges for the storage for any Amazon EBS volumes.

Reference: http://aws.amazon.com/ec2/faqs/


Q158. Please select the Amazon EC2 resource which can be tagged.

A. key pairs

B. Elastic IP addresses

C. placement groups

D. Amazon EBS snapshots 

Answer: C


Q159. Your application is using an ELB in front of an Auto Scaling group of web/application sewers deployed across two AZs and a MuIti-AZ RDS Instance for data persistence.

The database CPU is often above 80% usage and 90% of 1/0 operations on the database are reads. To improve performance you recently added a single-node Memcached EIastiCache Cluster to cache frequent DB query results. In the next weeks the overall workload is expected to grow by 30%.

Do you need to change anything in the architecture to maintain the high availability or the application with the anticipated additional load? Why?

A. Yes, you should deploy two Memcached EIastiCache Clusters in different AZs because the RDS instance will not be able to handle the load if the cache node fails.

B. No, if the cache node fails you can always get the same data from the DB without having any availability impact.

C. No, if the cache node fails the automated EIastiCache node recovery feature will prevent any availability impact.

D. Yes, you should deploy the Memcached EIastiCache Cluster with two nodes in the same AZ as the RDS DB master instance to handle the load if one cache node fails.

Answer:

Explanation:

EIastiCache for Memcached

The primary goal of caching is typically to offload reads from your database or other primary data source. In most apps, you have hot spots of data that are regularly queried, but only updated periodically. Think of the front page of a blog or news site, or the top 100 leaderboard in an online game. In this type of case, your app can receive dozens, hundreds, or even thousands of requests for the same data before it's   updated again. Having your caching layer handle these queries has several advantages. First, it's considerably cheaper to add an in-memory cache than to scale up to a larger database cluster. Second,

an in-memory cache is also easier to scale out, because it's easier to distribute an in-memory cache horizontally than a relational database.

Last, a caching layer provides a request buffer in the event of a sudden spike in usage. If your app or game ends up on the front page of Reddit or the App Store, it's not unheard of to see a spike that is 10 to 100 times your normal application load. Even if you autoscale your application instances, a IOx request spike will likely make your database very unhappy.

Let's focus on EIastiCache for Memcached first, because it is the best fit for a caching focused solution. We'II revisit Redislater in the paper, and weigh its advantages and disadvantages.

Architecture with EIastiCache for Memcached

When you deploy an EIastiCache Memcached cluster, it sits in your application as a separate tier alongside your database. As mentioned previously, Amazon EIastiCache does not directly communicate with your database tier, or indeed have any particular knowledge of your database. A simplified deployment for a web application looks something like this:

In this architecture diagram, the Amazon EC2 application instances are in an Auto Scaling group, located behind a load balancer using Elastic Load Balancing, which distributes requests among the instances. As requests come into a given EC2 instance, that EC2 instance is responsible for communicating with EIastiCache and the database tier. For development purposes, you can begin with a single EIastiCache node to test your application, and then scale to additional cluster nodes by modifying t he EIastiCache cluster. As you add additional cache nodes, the EC2 application instances are able to distribute cache  keys across multiple EIastiCache nodes. The most common practice is to use client-side sharding to distribute keys across cache nodes, which we will discuss later in this paper.

When you launch an EIastiCache cluster, you can choose the Availability Zone(s) that the cluster lives in. For best performance, you should configure your cluster to use the same Availability Zones as your application servers. To launch an EIastiCache cluster in a specific Availability Zone, make sure to specify the Preferred Zone(s) option during cache cluster creation. The Availability Zones that you specify will be where EIastiCache will launch your cache nodes. We recommend that you select Spread Nodes Across Zones, which tells EIastiCache to distribute cache nodes across these zones as evenly as possible. This distribution will mitigate the impact of an Availability Zone disruption on your E|astiCache nodes. The trade-off is that some of the requests from your application to EIastiCache will go to a node in a different Availability Zone, meaning latency will be slightly higher.

For more details, refer to Creating a Cache Cluster in the Amazon EIastiCache User Guide.

As mentioned at the outset, EIastiCache can be coupled with a wide variety of databases. Here is an example architecture that uses Amazon DynamoDB instead of Amazon RDS and IV|ySQL:

This combination of DynamoDB and EIastiCache is very popular with mobile and game companies, because DynamoDB allows for higher write throughput at lower cost than traditional relational databases. In addition, DynamoDB uses a key-value access pattern similar to EIastiCache, which also simplifies the programming model. Instead of using relational SQL for the primary database but then key-value patterns for the cache, both the primary database and cache can be programmed similarly.

In this architecture pattern, DynamoDB remains the source of truth for data, but application reads are offloaded to EIastiCache for a speed boost.


Q160. Please select the most correct answer regarding the persistence of the Amazon Instance Store

A. The data on an instance store volume persists only during the life of the associated Amazon EC2 instance

B. The data on an instance store volume is lost when the security group rule of the associated instance is changed.

C. The data on an instance store volume persists even after associated Amazon EC2 instance is deleted 

Answer: B



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