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August 10, 2017

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Q201. An ERP application is deployed across multiple AZs in a single region. In the event of failure, the Recovery Time Objective (RTO) must be less than 3 hours, and the Recovery Point Objective (RPO) must be 15 minutes the customer realizes that data corruption occurred roughly 1.5 hours ago.

What DR strategy could be used to achieve this RTO and RPO in the event of this kind of failure?

A. Take hourly DB backups to 53, with transaction logs stored in 53 every 5 minutes.

B. Use synchronous database master-slave replication between two availability zones.

C. Take hourly DB backups to EC2 Instance store volumes with transaction logs stored In 53 every 5 minutes.

D. Take 15 minute DB backups stored In Glacier with transaction logs stored in 53 every 5 minutes. 

Answer: A


Q202. You have been asked to design the storage layer for an application. The application requires disk

performance of at least 100,000 IOPS in addition, the storage layer must be able to survive the loss of an indMdual disk. EC2 instance, or Availability Zone without any data loss. The volume you provide must have a capacity of at least 3 TB. Which of the following designs will meet these objectives'?

A. Instantiate a c3.8x|arge instance in us-east-1. Provision 4x1TB EBS volumes, attach them to the instance, and configure them as a single RAID 5 volume. Ensure that EBS snapshots are performed every 15 minutes.

B. Instantiate a c3.8xIarge instance in us-east-1. Provision 3xiTB EBS volumes, attach them to the Instance, and configure them as a single RAID 0 volume. Ensure that EBS snapshots are performed every 15 minutes.

C. Instantiate an i2.8xIarge instance in us-east-Ia. Create a RAID 0 volume using the four 800GB SSD ephemeral disks provided with the instance. Provision 3x1TB EBS volumes, attach them to the instance, and configure them as a second RAID 0 volume. Configure synchronous, block-level replication from the ephemeral-backed volume to the EBS-backed volume.

D. Instantiate a c3.8xIarge instance in us-east-1. Provision an AWS Storage Gateway and configure it for 3 TB of storage and 100,000 IOPS. Attach the volume to the instance. E. Instantiate an i2.8x|arge   instance in us-east-Ia. Create a RAID 0 volume using the four 800GB SSD ephemeral disks provided with the instance. Configure synchronous, block- level replication to an identically configured instance in

us-east-Ib. 

Answer: C


Q203. Which DNS name can only be resolved within Amazon EC2?

A. Public DNS name

B. Internal DNS name

C. External DNS name

D. Global DNS name 

Answer: B

Explanation:

Only Internal DNS name can be resolved within Amazon EC2. Reference:

http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/using-instance-addressing.htmI


Q204. In Amazon RDS, security groups are ideally used to:

A. Define maintenance period for database engines

B. Launch Amazon RDS instances in a subnet

C. Create, describe, modify, and delete DB instances

D. Control what IP addresses or EC2 instances can connect to your databases on a DB instance 

Answer: D

Explanation:

In Amazon RDS, security groups are used to control what IP addresses or EC2 instances can connect to your databases on a DB instance.

When you first create a DB instance, its firewall prevents any database access except through rules specified by an associated security group.

Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.htmI


Q205. After you recommend Amazon Redshift to a client as an alternative solution to paying data warehouses to analyze his data, your client asks you to explain why you are recommending Redshift. Which of the following would be a reasonable response to his request?

A. It has high performance at scale as data and query complexity grows.

B. It prevents reporting and analytic processing from interfering with the performance of OLTP workloads.

C. You don't have the administrative burden of running your own data warehouse and dealing with setup, durability, monitoring, scaling, and patching.

D. All answers listed are a reasonable response to his QUESTION  

Answer: D

Explanation:

Amazon Redshift delivers fast query performance by using columnar storage technology to improve I/O efficiency and parallelizing queries across multiple nodes. Redshift uses standard PostgreSQL JDBC and ODBC drivers, allowing you to use a wide range of familiar SQL clients. Data load speed scales linearly with cluster size, with integrations to Amazon S3, Amazon DynamoDB, Amazon Elastic MapReduce,

Amazon Kinesis or any SSH-enabled host.

AWS recommends Amazon Redshift for customers who have a combination of needs, such as: High performance at scale as data and query complexity grows

Desire to prevent reporting and analytic processing from interfering with the performance of OLTP workloads

Large volumes of structured data to persist and query using standard SQL and existing BI tools Desire to the administrative burden of running one's own data warehouse and dealing with setup, durability, monitoring, scaling and patching

Reference: https://aws.amazon.com/running_databases/#redshift_anchor


Q206. You have just set up a large site for a client which involved a huge database which you set up with Amazon RDS to run as a Mu|ti-AZ deployment. You now start to worry about what will happen if the database instance fails. Which statement best describes how this database will function if there is a database failure?

A. Updates to your DB Instance are synchronously replicated across Availability Zones to the standby in order to keep both in sync and protect your latest database updates against DB Instance failure.

B. Your database will not resume operation without manual administrative intervention.

C. Updates to your DB Instance are asynchronously replicated across Availability Zones to the standby in order to keep both in sync and protect your latest database updates against DB Instance failure.

D. Updates to your DB Instance are synchronously replicated across S3 to the standby in order to keep both in sync and protect your latest database updates against DB Instance failure.

Answer:

Explanation:

Amazon Relational Database Service (Amazon RDS) is a managed service that makes it easy to set up, operate, and scale a relational database in the cloud. It provides cost-efficient and resizable capacity, while managing time-consuming database administration tasks, freeing you up to focus on your applications and business.

When you create or modify your DB Instance to run as a MuIti-AZ deployment, Amazon RDS automatically provisions and maintains a synchronous "standby" replica in a different Availability Zone. Updates to your DB Instance are synchronously replicated across Availability Zones to the standby in order to keep both in sync and protect your latest database updates against DB Instance failure.

During certain types of planned maintenance, or in the unlikely event of DB Instance failure or Availability Zone failure, Amazon RDS will automatically failover to the standby so that you can resume database writes and reads as soon as the standby is promoted. Since the name record for your DB Instance

remains the same, you application can resume database operation without the need for manual administrative intervention. With Mu|ti-AZ deployments, replication is transparent: you do not interact directly with the standby, and it cannot be used to serve read traffic. If you are using Amazon RDS for MySQL and are looking to scale read traffic beyond the capacity constraints of a single DB Instance, you can deploy one or more Read Replicas.

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


Q207. A user is running a batch process which runs for 1 hour every day. Which of the below mentioned options is the right instance type and costing model in this case if the user performs the same task for the whole year?

A. EBS backed instance with on-demand instance pricing.

B. EBS backed instance with heavy utilized reserved instance pricing.

C. EBS backed instance with low utilized reserved instance pricing.

D. Instance store backed instance with spot instance pricing. 

Answer: A

Explanation:

For Amazon Web Services, the reserved instance helps the user save money if the user is going to run the same instance for a longer period. Generally if the user uses the instances around 30-40% annually it is recommended to use RI. Here as the instance runs only for 1 hour daily it is not recommended to have RI as it will be costlier. The user should use on-demand with EBS in this case.

Reference: http://aws.amazon.com/ec2/purchasing-options/reserved-instances/


Q208. Disabling automated backups _ disable the point-in-time recovery.

A. if configured to can

B. will never

C. will 

Answer: C


Q209. You have been doing a lot of testing of your VPC Network by deliberately failing EC2 instances to test whether instances are failing over properly. Your customer who will be paying the AWS bill for all this asks you if he being charged for all these instances. You try to explain to him how the billing works on EC2 instances to the best of your knowledge. What would be an appropriate response to give to the customer

in regards to this?

A. Billing commences when Amazon EC2 AM instance is completely up and billing ends as soon as the instance starts to shutdown.

B. Billing only commences only after 1 hour of uptime and billing ends when the instance terminates.

C. Billing commences when Amazon EC2 initiates the boot sequence of an AM instance and billing ends when the instance shuts down.

D. Billing commences when Amazon EC2 initiates the boot sequence of an AM instance and billing ends as soon as the instance starts to shutdown.

Answer: C

Explanation:

Billing commences when Amazon EC2 initiates the boot sequence of an AM instance. Billing ends when the instance shuts down, which could occur through a web services command, by running "shutdown -h", or through instance failure.

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


Q210. A user has defined an AutoScaIing termination policy to first delete the instance with the nearest billing hour. AutoScaIing has launched 3 instances in the US-East-1A region and 2 instances in the US-East-1 B region. One of the instances in the US-East-1B region is running nearest to the billing hour. Which instance will AutoScaIing terminate first while executing the termination action?

A. Random Instance from US-East-1A

B. Instance with the nearest billing hour in US-East-1 B

C. Instance with the nearest billing hour in US-East-1A

D. Random instance from US-East-1B 

Answer: C

Explanation:

Even though the user has configured the termination policy, before AutoScaIing selects an instance to terminate, it first identifies the Availability Zone that has more instances than the other Availability Zones used by the group. Within the selected Availability Zone, it identifies the instance that matches the specified termination policy.

Reference:  http://docs.aws.amazon.com/AutoScaIing/latest/DeveIoperGuide/us-termination-policy.html



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