AWS-SysOps Exam
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Q41. - (Topic 1)
If you want to launch Amazon Elastic Compute Cloud (EC2) Instances and assign each Instance a predetermined private IP address you should:
A. Assign a group or sequential Elastic IP address to the instances
B. Launch the instances in a Placement Group
C. Launch the instances in the Amazon virtual Private Cloud (VPC).
D. Use standard EC2 instances since each instance gets a private Domain Name Service (DNS) already
E. Launch the Instance from a private Amazon Machine image (Mil)
Answer: C
Explanation: Reference:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-ip-addressing.html
Q42. - (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: C
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.
Q43. - (Topic 3)
An organization has configured two single availability zones. The Auto Scaling groups are configured in
separate zones. The user wants to merge the groups such that one group spans across multiple zones. How can the user configure this?
A. Run the command as-join-auto-scaling-group to join the two groups
B. Run the command as-update-auto-scaling-group to configure one group to span across zones and delete the other group
C. Run the command as-copy-auto-scaling-group to join the two groups
D. Run the command as-merge-auto-scaling-group to merge the groups
Answer: B
Explanation:
If the user has configured two separate single availability zone Auto Scaling groups and wants to merge them then he should update one of the groups and delete the other one. While updating the first group it is recommended that the user should increase the size of the minimum, maximum and desired capacity as a summation of both the groups.
Q44. - (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: C
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.
Q45. - (Topic 3)
A user has created a Cloudformation stack. The stack creates AWS services, such as EC2 instances, ELB, AutoScaling, and RDS. While creating the stack it created EC2, ELB and AutoScaling but failed to create RDS. What will Cloudformation do in this scenario?
A. Cloudformation can never throw an error after launching a few services since it verifies all the steps before launching
B. It will warn the user about the error and ask the user to manually create RDS
C. Rollback all the changes and terminate all the created services
D. It will wait for the user’s input about the error and correct the mistake after the input
Answer: C
Explanation:
AWS Cloudformation is an application management tool which provides application modelling, deployment, configuration, management and related activities. The AWS Cloudformation stack is a collection of AWS resources which are created and managed as a single unit when AWS CloudFormation instantiates a template. If any of the services fails Amazon AWS-SysOps : Practice Test
to launch, Cloudformation will rollback all the changes and terminate or delete all the created services.
Q46. - (Topic 3)
A user has launched an RDS MySQL DB with the Multi AZ feature. The user has scheduled the scaling of
instance storage during maintenance window. What is the correct order of events during maintenance window?
Perform maintenance on standby
Promote standby to primary
Perform maintenance on original primary
Promote original master back as primary
A. 1, 2, 3, 4
B. 1, 2, 3
C. 2, 3, 1, 4
Answer: B
Explanation:
Running MySQL on the RDS DB instance as a Multi-AZ deployment can help the user reduce the impact of a maintenance event, as the Amazon will conduct maintenance by following the steps in the below mentioned order: Perform maintenance on standby Promote standby to primary Perform maintenance on original primary, which becomes the new standby.
Q47. - (Topic 1)
A media company produces new video files on-premises every day with a total size of around 100GBS after compression All files have a size of 1 -2 GB and need to be uploaded to Amazon S3 every night in a fixed time window between 3am and 5am Current upload takes almost 3 hours, although less than half of the available bandwidth is used.
What step(s) would ensure that the file uploads are able to complete in the allotted time window?
A. Increase your network bandwidth to provide faster throughput to S3
B. Upload the files in parallel to S3
C. Pack all files into a single archive, upload it to S3, then extract the files in AWS
D. Use AWS Import/Export to transfer the video files
Answer: B
Explanation: Reference:
http://aws.amazon.com/importexport/faqs/
Q48. - (Topic 3)
A user runs the command “dd if=/dev/xvdf of=/dev/null bs=1M” on an EBS volume created from a snapshot and attached to a Linux instance. Which of the below mentioned activities is the user performing with the step given above?
A. Pre warming the EBS volume
B. Initiating the device to mount on the EBS volume
C. Formatting the volume
D. Copying the data from a snapshot to the device
Answer: A
Explanation:
When the user creates an EBS volume and is trying to access it for the first time it will encounter reduced IOPS due to wiping or initiating of the block storage. To avoid this as well as achieve the best performance it is required to pre warm the EBS volume. For a volume created from a snapshot and attached with a Linux OS, the “dd” command pre warms the existing data on EBS and any restored snapshots of volumes that have been previously fully pre warmed. This command maintains incremental snapshots; however, because this operation is read-only, it does not pre warm unused space that has never been written to on the original volume. In the command “dd if=/dev/xvdf of=/dev/null bs=1M” , the parameter “if=input file” should be set to the drive that the user wishes to warm. The “of=output file” parameter should be set to the Linux null virtual device, /dev/null. The “bs” parameter sets the block size of the read operation; for optimal performance, this should be set to 1 MB.
Q49. - (Topic 3)
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. Which of the
below mentioned statements is true with respect to this scenario?
A. The instance will always have a public DNS attached to the instance by default
B. The user can directly attach an elastic IP to the instance
C. The instance will never launch if the public IP is not assigned
D. The user would need to create an internet gateway and then attach an elastic IP to the instance to connect from internet
Answer: D
Explanation:
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. The user cannot connect to the instance from the internet. If the user wants an elastic IP to connect to the instance from the internet he should create an internet gateway and assign an elastic IP to instance.
Q50. - (Topic 3)
A user is measuring the CPU utilization of a private data centre machine every minute. The machine provides the aggregate of data every hour, such as Sum of data”, “Min value”, “Max value, and “Number of Data points”.
The user wants to send these values to CloudWatch. How can the user achieve this?
A. Send the data using the put-metric-data command with the aggregate-values parameter
B. Send the data using the put-metric-data command with the average-values parameter
C. Send the data using the put-metric-data command with the statistic-values parameter
D. Send the data using the put-metric-data command with the aggregate –data parameter
Answer: C
Explanation:
AWS CloudWatch supports the custom metrics. The user can always capture the custom data and upload the data to CloudWatch using CLI or APIs. The user can publish the data to CloudWatch as single data points or as an aggregated set of data points called a statistic set using the command put-metric-data. When sending the aggregate data, the user needs to send it with the parameter statistic-values: awscloudwatch put-metric-data --metric-name <Name> --namespace <Custom namespace> --timestamp <UTC Format> --statistic-values Sum=XX,Minimum=YY,Maximum=AA,SampleCount=BB --unit Milliseconds