Tag: AWS Certified Solutions Architect – Professional SAP-C01

AWS Certified Solutions Architect – Professional SAP-C01 – Question389

A user is trying to send custom metrics to CloudWatch using the PutMetricData APIs. Which of the below mentioned points should the user needs to take care while sending the data to CloudWatch?

A. The size of a request is limited to 8KB for HTTP GET requests and 40KB for HTTP POST requests
B. The size of a request is limited to 16KB for HTTP GET requests and 80KB for HTTP POST requests
C. The size of a request is limited to 128KB for HTTP GET requests and 64KB for HTTP POST requests
D. The size of a request is limited to 40KB for HTTP GET requests and 8KB for HTTP POST requests

Correct Answer: A

Explanation:

Explanation: With AWS CloudWatch, the user can publish data points for a metric that share not only the same time stamp, but also the same namespace and dimensions. CloudWatch can accept multiple data points in the same PutMetricData call with the same time stamp. The only thing that the user needs to take care of is that the size of a PutMetricData request is limited to 8KB for HTTP GET requests and 40KB for HTTP POST requests.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/c…

AWS Certified Solutions Architect – Professional SAP-C01 – Question388

You have set up a huge amount of network infrastructure in AWS and you now need to think about monitoring all of this. You decide CloudWatch will best fit your needs but you are unsure of the pricing structure and the limitations of CloudWatch.
Which of the following statements is TRUE in relation to the limitations of CloudWatch?

A. You get 10 CloudWatch metrics, 10 alarms, 1,000,000 API requests, and 1,000 Amazon SNS email notifications per customer per month for free.
B. You get 100 CloudWatch metrics, 100 alarms, 10,000,000 API requests, and 10,000 Amazon SNS email notifications per customer per month for free.
C. You get 10 CloudWatch metrics, 10 alarms, 1,000 API requests, and 100 Amazon SNS email notifications per customer per month for free.
D. You get 100 CloudWatch metrics, 100 alarms, 1,000,000 API requests, and 1,000 Amazon SNS email notifications per customer per month for free.

Correct Answer: A

Explanation:

Explanation: Amazon CloudWatch monitors your Amazon Web Services (AWS) resources and the applications you run on AWS in real-time. You can use CloudWatch to collect and track metrics, which are the variables you want to measure for your resources and applications. CloudWatch has the following limits: You get 10 CloudWatch metrics, 10 alarms, 1,000,000 API requests, and 1,000 Amazon SNS email notifications per customer per month for free.
You can assign up to 10 dimensions per metric. You can create up to 5000 alarms per AWS account. Metric data is kept for 2 weeks. The size of a PutMetricData request is limited to 8KB for HTTP GET requests and 40KB for HTTP POST requests. You can include a maximum of 20 MetricDatum items in one PutMetricData request. A MetricDatum can contain a single value or a StatisticSet representing many values.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/c…

AWS Certified Solutions Architect – Professional SAP-C01 – Question387

What is the maximum number of data points for an HTTP data request that a user can include in PutMetricRequest in the CloudWatch?

A. 30
B. 50
C. 10
D. 20

Correct Answer: D

Explanation:

Explanation: The size of a PutMetricData request of CloudWatch is limited to 8KB for the HTTP GET requests and 40KB for the HTTP POST requests. The user can include a maximum of 20 data points in one PutMetricData request.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/c…

AWS Certified Solutions Architect – Professional SAP-C01 – Question386

A user is sending a custom metric to CloudWatch. If the call to the CloudWatch APIs has different dimensions, but the same metric name, how will CloudWatch treat all the requests?

A. It will reject the request as there cannot be a separate dimension for a single metric.
B. It will group all the calls into a single call.
C. It will treat each unique combination of dimensions as a separate metric.
D. It will overwrite the previous dimension data with the new dimension data.

Correct Answer: C

Explanation:

Explanation: A dimension is a key-value pair used to uniquely identify a metric. CloudWatch treats each unique combination of dimensions as a separate metric. Thus, if the user is making 4 calls with the same metric name but a separate dimension, it will create 4 separate metrics.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/c…

AWS Certified Solutions Architect – Professional SAP-C01 – Question385

A user has created a launch configuration for Auto Scaling where CloudWatch detailed monitoring is disabled. The user wants to now enable detailed monitoring.
How can the user achieve this?

A. Update the Launch config with CLI to set InstanceMonitoringDisabled = false
B. The user should change the Auto Scaling group from the AWS console to enable detailed monitoring
C. Create a new Launch Config with detail monitoring enabled and update the Auto Scaling group
D. Update the Launch config with CLI to set InstanceMonitoring.Enabled = true

Correct Answer: C

Explanation:

Explanation: CloudWatch is used to monitor AWS as well as the custom services. To enable detailed instance monitoring for a new Auto Scaling group, the user does not need to take any extra steps. When the user creates the Auto Scaling launch config as the first step for creating an Auto Scaling group, each launch configuration contains a flag named InstanceMonitoring.Enabled. The default value of this flag is true. When the user has created a launch configuration with InstanceMonitoring.Enabled = false it will involve multiple steps to enable detail monitoring. The steps are:

  • Create a new Launch config with detailed monitoring enabled
  • Update the Auto Scaling group with a new launch config
  • Enable detail monitoring on each EC2 instance

Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/a…

AWS Certified Solutions Architect – Professional SAP-C01 – Question384

A user is running a critical batch process which runs for 1 hour and 50 mins every day at a fixed time. 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. Instance store backed instance with spot instance pricing.
B. EBS backed instance with standard reserved upfront instance pricing.
C. EBS backed scheduled reserved instance with partial instance pricing.
D. EBS backed instance with on-demand instance pricing.

Correct Answer: D

Explanation:

Explanation: For Amazon Web Services, the reserved instance (standard or convertible) 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% of the year annually it is recommended to use RI. Here as the instance runs only for 1 hour 50 minutes daily, or less than 8 percent of the year, it is not recommended to have RI as it will be costlier. At its highest potential savings, you are still paying 25 percent of an annual cost for a reserved instance you are you using less than 2 hours a day, (or less than 8 percent of each year) you are not saving money. Even a scheduled reserved instance has a key limitation, which is that it cannot be stopped or rebooted, only manually terminated with a possibility that it could be restarted. You would have to terminate and restart it within the 1 hour 50-minute window, otherwise you would need to wait until the next day. For a critical daily process, this is likely not an option. Spot Instances are not ideal because the process is critical, and must run for a fixed length of time at a fixed time of day. Spot instances would stop and start based on fluctuations in instance pricing, leaving this process potentially unfinished. The user should use on-demand with EBS in this case. While it has the highest cost, it also has the greatest flexibility to ensure that a critical process like this is always completed.
Reference:
http://aws.amazon.com/ec2/purchasing-options/reserved-instances/

AWS Certified Solutions Architect – Professional SAP-C01 – Question383

A user is creating a snapshot of an EBS volume. Which of the below statements is incorrect in relation to the creation of an EBS snapshot?

A. Its incremental
B. It is a point in time backup of the EBS volume
C. It can be used to create an AMI
D. It is stored in the same AZ as the volume

Correct Answer: D

Explanation:

Explanation: The EBS snapshots are a point in time backup of the EBS volume. It is an incremental snapshot, but is always specific to the region and never specific to a single AZ. Hence the statement “It is stored in the same AZ as the volume” is incorrect.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSSnapshots.html

AWS Certified Solutions Architect – Professional SAP-C01 – Question382

Which of the following is true of Amazon EBS encryption keys?

A. Amazon EBS encryption uses the Customer Master Key (CMK) to create an AWS Key Management Service (AWS KMS) master key.
B. Amazon EBS encryption uses the EBS Magnetic key to create an AWS Key Management Service (AWS KMS) master key.
C. Amazon EBS encryption uses the EBS Magnetic key to create a Customer Master Key (CMK).
D. Amazon EBS encryption uses the AWS Key Management Service (AWS KMS) master key to create a Customer Master Key (CMK).

Correct Answer: D

Explanation:

Explanation: Amazon EBS encryption uses AWS Key Management Service (AWS KMS) master keys when creating encrypted volumes and any snapshots created from your encrypted volumes.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AmazonEBS.html

AWS Certified Solutions Architect – Professional SAP-C01 – Question381

Which of the following rules must be added to a mount target security group to access Amazon Elastic File System (EFS) from an on-premises server?

A. Configure an NFS proxy between Amazon EFS and the on-premises server to route traffic.
B. Set up a Point-To-Point Tunneling Protocol Server (PPTP) to allow secure connection.
C. Permit secure traffic to the Kerberos port 88 from the on-premises server.
D. Allow inbound traffic to the Network File System (NFS) port (2049) from the on-premises server.

Correct Answer: D

Explanation:

Explanation: By mounting an Amazon EFS file system on an on-premises server, on-premises data can be migrated into the AWS Cloud. Any one of the mount targets in your VPC can be used as long as the subnet of the mount target is reachable by using the AWS Direct Connect connection. To access Amazon EFS from an on-premises server, a rule must be added to the mount target security group to allow inbound traffic to the NFS port (2049) from the on-premises server.
Reference:
http://docs.aws.amazon.com/efs/latest/ug/how-it-works.html

AWS Certified Solutions Architect – Professional SAP-C01 – Question380

You have custom Network File System (NFS) client settings for your Amazon Elastic File System (EFS). It takes up to three seconds for an Amazon Elastic Compute Cloud (EC2) instance to see a write operation performed on a file system from another Amazon EC2 instance.
Which of the following actions should you take to solve the custom NFS settings from causing delays in the write operation?

A. Unmount and remount the file system with the noac option to disable attribute caching.
B. Reduce the number of active users that have files open simultaneously on the instances.
C. Verify that the IP address of the specified mount target is valid.
D. Run the write operation from a different user ID on the same Amazon EC2 instance.

Correct Answer: A

Explanation:

Explanation: When you set up custom NFS client settings, it takes up to three seconds for an Amazon EC2 instance to see a write operation being performed on a file system from another Amazon EC2 instance. To solve this issue, you must unmount and remount your file system with the noac option to disable attribute caching if the NFS client on the Amazon EC2 instance that is reading the data has attribute caching activated. Attribute cache can also be cleared on demand by using a programming language that is compatible with the NFS procedures. To do this, you must send an ACCESS procedure request immediately before a read request.
Reference:
http://docs.aws.amazon.com/efs/latest/ug/troubleshooting.html#custo…