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Q41. – (Topic 3) 

A user has setup a VPC with CIDR 20.0.0.0/16. The VPC has a private subnet (20.0.1.0/24. and a public 

subnet (20.0.0.0/24.. The user’s data centre has CIDR of 20.0.54.0/24 and 20.1.0.0/24. If the private subnet wants to communicate with the data centre, what will happen? 

A. It will allow traffic communication on both the CIDRs of the data centre 

B. It will not allow traffic with data centre on CIDR 20.1.0.0/24 but allows traffic communication on 

20.0.54.0/24 

C. It will not allow traffic communication on any of the data centre CIDRs 

D. It will allow traffic with data centre on CIDR 20.1.0.0/24 but does not allow on 20.0.54.0/24 

Answer:

Explanation: 

VPC allows the user to set up a connection between his VPC and corporate or home network data centre. If the user has an IP address prefix in the VPC that overlaps with one of the networks' prefixes, any traffic to the network's prefix is dropped. In this case CIDR 20.0.54.0/24 falls in the VPC’s CIDR range of 20.0.0.0/16. Thus, it will not allow traffic on that IP. In the case of 20.1.0.0/24, it does not fall in the VPC’s CIDR range. Thus, traffic will be allowed on it. 

Q42. – (Topic 2) 

A user is trying to aggregate all the CloudWatch metric data of the last 1 week. Which of the below mentioned statistics is not available for the user as a part of data aggregation? 

A. Aggregate 

B. Sum 

C. Sample data 

D. Average 

Answer:

Explanation: 

Amazon CloudWatch is basically a metrics repository. Either the user can send the custom data or an AWS product can put metrics into the repository, and the user can retrieve the statistics based on those metrics. The statistics are metric data aggregations over specified periods of time. Aggregations are made using the namespace, metric name, dimensions, and the data point unit of measure, within the time period that is specified by the user. CloudWatch supports Sum, Min, Max, Sample Data and Average statistics aggregation. 

Q43. – (Topic 3) 

A user has created a VPC with CIDR 20.0.0.0/16 using the wizard. The user has created public and VPN only subnets along with hardware VPN access to connect to the user’s data centre. The user has not yet launched any instance as well as modified or deleted any setup. He wants to delete this VPC from the console. Will the console allow the user to delete the VPC? 

A. Yes, the console will delete all the setups and also delete the virtual private gateway B. No, the console will ask the user to manually detach the virtual private gateway first and then allow deleting the VPC 

C. Yes, the console will delete all the setups and detach the virtual private gateway 

D. No, since the NAT instance is running 

Answer:

Explanation: 

The user can create subnets as per the requirement within a VPC. If the user wants to connect VPC from his own data centre, he can setup a public and VPN only subnet which uses hardware VPN access to connect with his data centre. When the user has configured this setup with Wizard, it will create a virtual private gateway to route all traffic of the VPN subnet. If the virtual private gateway is attached with VPC and the user deletes the VPC from the console it will first detach the gateway automatically and only then delete the VPC. 

Q44. – (Topic 1) 

When an EC2 instance that is backed by an S3-based AMI Is terminated, what happens to the data on me root volume? 

A. Data is automatically saved as an E8S volume. 

B. Data is automatically saved as an ESS snapshot. 

C. Data is automatically deleted. 

D. Data is unavailable until the instance is restarted. 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ComponentsAMIs.html 

Q45. – (Topic 3) 

How can you secure data at rest on an EBS volume? 

A. Encrypt the volume using the S3 server-side encryption service. 

B. Attach the volume to an instance using EC2's SSL interface. 

C. Create an IAM policy that restricts read and write access to the volume. 

D. Write the data randomly instead of sequentially. 

E. Use an encrypted file system m top of the EBS volume. 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/IAM/latest/UserGuide/policies_examples.html 

Q46. – (Topic 3) 

A user has created a VPC with CIDR 20.0.0.0/16 using VPC Wizard. The user has created a public CIDR 

(20.0.0.0/24. and a VPN only subnet CIDR (20.0.1.0/24. along with the hardware VPN access to connect to the user’s data centre. Which of the below mentioned components is not present when the VPC is setup with the wizard? 

A. Main route table attached with a VPN only subnet 

B. A NAT instance configured to allow the VPN subnet instances to connect with the internet 

C. Custom route table attached with a public subnet 

D. An internet gateway for a public subnet 

Answer:

Explanation: 

The user can create subnets as per the requirement within a VPC. If the user wants to connect VPC from his own data centre, he can setup a public and VPN only subnet which uses hardware VPN access to connect with his data centre. When the user has configured this setup with Wizard, it will update the main route table used with the VPN-only subnet, create a custom route table and associate it with the public subnet. It also creates an internet gateway for the public subnet. The wizard does not create a NAT instance by default. The user can create it manually and attach it with a VPN only subnet. 

Q47. – (Topic 3) 

A user is trying to create an EBS volume with the highest PIOPS supported by EBS. What is the minimum size of EBS required to have the maximum IOPS? 

A. 124 

B. 150 

C. 134 

D. 128 

Answer:

Explanation: 

A provisioned IOPS EBS volume can range in size from 10 GB to 1 TB and the user can provision up to 4000 IOPS per volume. The ratio of IOPS provisioned to the volume size requested should be a maximum of 30. 

Q48. – (Topic 3) 

An organization is trying to create various IAM users. Which of the below mentioned options is not a valid IAM username? 

A. John.cloud 

B. john@cloud 

C. John=cloud 

D. john#cloud 

Answer:

Explanation: 

AWS Identity and Access Management is a web service which allows organizations to manage users and user permissions for various AWS services. Whenever the organization is creating an IAM user, there should be a unique ID for each user. The names of users, groups, roles, instance profiles must be alphanumeric, including the following common characters: plus (+., equal (=., comma (,., period (.., at (@., and dash (-.. 

Q49. – (Topic 1) 

You have an Auto Scaling group associated with an Elastic Load Balancer (ELB). You have noticed that instances launched via the Auto Scaling group are being marked unhealthy due to an ELB health check, but these unhealthy instances are not being terminated 

What do you need to do to ensure trial instances marked unhealthy by the ELB will be terminated and replaced? 

A. Change the thresholds set on the Auto Scaling group health check 

B. Add an Elastic Load Balancing health check to your Auto Scaling group 

C. Increase the value for the Health check interval set on the Elastic Load Balancer 

D. Change the health check set on the Elastic Load Balancer to use TCP rather than HTTP checks 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/as-add-elb-healthcheck.html 

Add an Elastic Load Balancing Health Check to your Auto Scaling Group 

By default, an Auto Scaling group periodically reviews the results of EC2 instance status to determine the health state of each instance. However, if you have associated your Auto Scaling group with an Elastic Load Balancing load balancer, you can choose to use the Elastic Load Balancing health check. In this case, Auto Scaling determines the health status of your instances by checking the results of both the EC2 instance status check and the Elastic Load Balancing instance health check. 

For information about EC2 instance status checks, see.Monitor Instances With Status Checks.in the.Amazon EC2 User Guide for Linux Instances. For information about Elastic Load Balancing health checks, see.Health Check.in the.Elastic Load Balancing Developer Guide. 

This topic shows you how to add an Elastic Load Balancing health check to your Auto Scaling group, assuming that you have created a load balancer and have registered the load balancer with your Auto Scaling group. If you have not registered the load balancer with your Auto Scaling group, see.Set Up a Scaled and Load-Balanced Application. 

Auto Scaling marks an instance unhealthy if the calls to the Amazon EC2 action.DescribeInstanceStatus.return any state other than.running, the system status shows.impaired, or the calls to Elastic Load Balancing action.DescribeInstanceHealth.returns.OutOfService.in the instance state field. 

If there are multiple load balancers associated with your Auto Scaling group, Auto Scaling checks the health state of your EC2 instances by making health check calls to each load balancer. For each call, if the Elastic Load Balancing action returns any state other than.InService, the instance is marked as unhealthy. After Auto Scaling marks an instance as unhealthy, it remains in that state, even if subsequent calls from other load balancers return an.InService.state for the same instance. 

Q50. – (Topic 1) 

You have been asked to propose a multi-region deployment of a web-facing application where a controlled portion of your traffic is being processed by an alternate region. 

Which configuration would achieve that goal? 

A. Route53 record sets with weighted routing policy 

B. Route53 record sets with latency based routing policy 

C. Auto Scaling with scheduled scaling actions set 

D. Elastic Load Balancing with health checks enabled 

Answer:

Explanation: Reference: 

http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/TerminologyandKeyConcepts.html 

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