Answer: A


The user can join multiple provisioned IOPS volumes together in a RAID 1 configuration to

achieve better fault tolerance. RAID 1 does not provide a write performance improvement; it requires more bandwidth than non-RAID configurations since the data is written simultaneously to multiple volumes.






Question: 102

A user has created a subnet in VPC and launched an EC2 instance within it. The user has not selected the option to assign the IP address while launching the instance. The user has 3 elastic IPs and is trying to assign one of the Elastic IPs to the VPC instance from the console. The console does not show any instance in the IP assignment screen. What is a possible reason that the instance is unavailable in the assigned IP console?

A.The IP address may be attached to one of the instances

B.The IP address belongs to a different zone than the subnet zone

C.The user has not created an internet gateway

D.The IP addresses belong to EC2 Classic; so they cannot be assigned to VPC





Answer: D


A Virtual Private Cloud (VPC) is a virtual network dedicated to the user’s AWS account. A user can create a subnet with VPC and launch instances inside that subnet. When the user is launching an instance he needs to select an option which attaches a public IP to the instance. If the user has not selected the option to attach the public IP then it will only have a private IP when launched. If the user wants to connect to an instance from the internet he should create an elastic IP with VPC. If the elastic IP is a part of EC2 Classic it cannot be assigned to a VPC instance. Reference:





Question: 103

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


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.






Question: 104

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


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: security.htm l





Question: 105

A user has created photo editing software and hosted it on EC2. The software accepts requests from the user about the photo format and resolution and sends a message to S3 to enhance the picture accordingly. Which of the below mentioned AWS services will help make a scalable software with the AWS infrastructure in this scenario?

A.AWS Simple Notification Service

B.AWS Simple Queue Service

C.AWS Elastic Transcoder

D.AWS Glacier





Answer: B


Amazon Simple Queue Service (SQS) is a fast, reliable, scalable, and fully managed message queuing service. SQS provides a simple and cost-effective way to decouple the components of an application. The user can configure SQS, which will decouple the call between the EC2 application and S3. Thus, the application does not keep waiting for S3 to provide the data.


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