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Q153. You are setting up some EBS volumes for a customer who has requested a setup which includes a RAID (redundant array of inexpensive disks). AWS has some recommendations for RAID setups. Which RAID setup is not recommended for Amazon EBS?
A. RAID 5 only
B. RAID 5 and RAID 6
C. RAID 1 only
D. RAID 1 and RAID 6
Answer: B
Explanation:
With Amazon EBS, you can use any of the standard RAID configurations that you can use with a traditional bare metal server, as long as that particular RAID configuration is supported by the operating system for your instance. This is because all RAID is accomplished at the software level. For greater I/O performance than you can achieve with a single volume, RAID 0 can stripe multiple volumes together; for on-instance redundancy, RAID 1 can mirror two volumes together.
RAID 5 and RAID 6 are not recommended for Amazon EBS because the parity write operations of these RAID modes consume some of the IOPS available to your volumes.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/raid-config.html
Q154. By default, EBS volumes that are created and attached t o an instance at launch are deleted when t hat instance is terminated. You can modify this behavior by changing the value of the flag _ to false when you launch the instance
A. Delete On Termination
B. Remove On Deletion
C. Remove On Termination
D. Terminate On Deletion
Answer: A
Q155. What can I access by visiting the URL: http:/ /status.aws.amazon.com/?
A. Amazon Cloud Watch
B. Status of the Amazon RDS DB
C. AWS Service Health Dashboard
D. AWS Cloud Monitor
Answer: C
Q156. Select a true statement about Amazon EC2 Security Groups (EC2-Classic).
A. After you launch an instance in EC2-Classic, you can't change its security groups.
B. After you launch an instance in EC2-Classic, you can change its security groups only once.
C. After you launch an instance in EC2-Classic, you can only add rules to a security group.
D. After you launch an instance in EC2-Classic, you cannot add or remove rules from a security group.
Answer: A
Explanation:
After you launch an instance in EC2-Classic, you can't change its security groups. However, you can add rules to or remove rules from a security group, and those changes are automatically applied to all instances that are associated with the security group.
Reference: http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/using-network-security.html
Q157. Your company is getting ready to do a major public announcement of a social media site on AWS. The website is running on EC2 instances deployed across multiple Availability Zones with a MuIti-AZ RDS MySQL Extra Large DB Instance. The site performs a high number of small reads and writes per second and relies on an eventual consistency model. After comprehensive tests you discover that there is read contention on RDS MySQL. Which are the best approaches to meet these requirements? (Choose 2 answers)
A. Deploy EIasticCache in-memory cache running in each availability zone
B. Implement sharding to distribute load to multiple RDS MySQL instances
C. Increase the RDS MySQL Instance size and Implement provisioned IQPS
D. Add an RDS MySQL read replica in each availability zone
Answer: A, C
Q158. A company is building a voting system for a popular TV show, viewers win watch the performances then visit the show's website to vote for their favorite performer. It is expected that in a short period of time after the show has finished the site will receive millions of visitors. The visitors will first login to the site using their Amazon.com credentials and then submit their vote. After the voting is completed the page will display the vote totals. The company needs to build the site such that can handle the rapid influx of traffic while maintaining good performance but also wants to keep costs to a minimum. Which of the design patterns below should they use?
A. Use Cloud Front and an Elastic Load balancer in front of an auto-scaled set of web servers, the web servers will first can the Login With Amazon service to authenticate the user then process the users vote and store the result into a multi-AZ Relational Database Service instance.
B. Use CIoudFront and the static website hosting feature of 53 with the Javascript SDK to call the Login With Amazon service to authenticate the user, use IAM Roles to gain permissions to a DynamoDB table to store the users vote.
C. Use Cloud Front and an Elastic Load Balancer in front of an auto-scaled set of web servers, the web servers will first call the Login with Amazon service to authenticate the user, the web servers will process the users vote and store the result into a DynamoDB table using IAM Roles for EC2 instances to gain permissions to the DynamoDB table.
D. Use Cloud Front and an Elastic Load Balancer in front of an auto-scaled set of web servers, the web servers will first call the Login. With Amazon service to authenticate the user, the web sewers win process the users vote and store the result into an SQS queue using IAM Roles for EC2 Instances to gain permissions to the SQS queue. A set of application sewers will then retrieve the items from the queue and store the result into a DynamoDB table.
Answer: D
Q159. George has launched three EC2 instances inside the US-East-1a zone with his AWS account. Ray has launched two EC2 instances in the US-East-Ia zone with his AWS account. Which of the below mentioned statements will help George and Ray understand the availability zone (AZ) concept better?
A. All the instances of George and Ray can communicate over a private IP with a minimal cost
B. The US-East-1a region of George and Ray can be different availability zones
C. All the instances of George and Ray can communicate over a private IP without any cost
D. The instances of George and Ray will be running in the same data centre
Answer: B
Explanation:
Each AWS region has multiple, isolated locations known as Availability Zones. To ensure that the AWS resources are distributed across the Availability Zones for a region, AWS independently maps the Availability Zones to identifiers for each account. In this case the Availability Zone US-East-Ia where George’s EC2 instances are running might not be the same location as the US-East-Ia zone of Ray’s EC2 instances. There is no way for the user to coordinate the Availability Zones between accounts.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html
Q160. What are the two types of licensing options available for using Amazon RDS for Oracle?
A. BYOL and Enterprise License
B. BYOL and License Included
C. Enterprise License and License Included
D. Role based License and License Included
Answer: B