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Q49. - (Topic 3)
A user has configured an ELB to distribute the traffic among multiple instances. The user instances are facing some issues due to the back-end servers. Which of the below mentioned CloudWatch metrics helps the user understand the issue with the instances?
A. HTTPCode_Backend_3XX
B. HTTPCode_Backend_4XX
C. HTTPCode_Backend_2XX
D. HTTPCode_Backend_5XX
Answer: D
Explanation:
CloudWatch is used to monitor AWS as well as the custom services. For ELB, CloudWatch provides various metrics including error code by ELB as well as by back-end servers (instances.. It gives data for the count of the number of HTTP response codes generated by the back-end instances. This metric does not include any response codes generated by the load balancer. These metrics are: The 2XX class status codes represents successful actions The 3XX class status code indicates that the user agent requires action The 4XX class status code represents client errors
The 5XX class status code represents back-end server errors
Q50. - (Topic 3)
A user has enabled versioning on an S3 bucket. The user is using server side encryption for data at Rest. If the user is supplying his own keys for encryption (SSE-C., which of the below mentioned statements is true?
A. The user should use the same encryption key for all versions of the same object
B. It is possible to have different encryption keys for different versions of the same object
C. AWS S3 does not allow the user to upload his own keys for server side encryption
D. The SSE-C does not work when versioning is enabled
Answer: B
Explanation:
AWS S3 supports client side or server side encryption to encrypt all data at rest. The server side encryption can either have the S3 supplied AES-256 encryption key or the user can send the key along with each API call to supply his own encryption key (SSE-C.. If the bucket is versioning-enabled, each object version uploaded by the user using the SSE-C feature can have its own encryption key. The user is responsible for tracking which encryption key was used for which object's version
Q51. - (Topic 2)
A system admin is managing buckets, objects and folders with AWS S3. Which of the below mentioned statements is true and should be taken in consideration by the sysadmin?
A. The folders support only ACL
B. Both the object and bucket can have an Access Policy but folder cannot have policy
C. Folders can have a policy
D. Both the object and bucket can have ACL but folders cannot have ACL
Answer: A
Explanation:
A sysadmin can grant permission to the S3 objects or the buckets to any user or make objects public using the bucket policy and user policy. Both use the JSON-based access policy language. Generally if user is defining the ACL on the bucket, the objects in the bucket do not inherit it and vice a versa. The bucket policy can be defined at the bucket level which allows the objects as well as the bucket to be public with a single policy applied to that bucket. It cannot be applied at the object level. The folders are similar to objects with no content. Thus, folders can have only ACL and cannot have a policy.
Q52. - (Topic 3)
When an EC2 instance mat is backed by an S3-Dased AMI is terminated, what happens to the data on the root volume?
A. Data is automatically deleted
B. Data is automatically saved as an EBS snapshot.
C. Data is unavailable until the instance is restarted
D. Data is automatically saved as an EBS volume.
Answer: A
Q53. - (Topic 2)
A sys admin has created a shopping cart application and hosted it on EC2. The EC2 instances are running behind ELB. The admin wants to ensure that the end user request will always go to the EC2 instance where the user session has been created. How can the admin configure this?
A. Enable ELB cross zone load balancing
B. Enable ELB cookie setup
C. Enable ELB sticky session
D. Enable ELB connection draining
Answer: C
Explanation:
Generally AWS ELB routes each request to a zone with the minimum load. The Elastic Load Balancer provides a feature called sticky session which binds the user’s session with a specific EC2 instance. If the sticky session is enabled the first request from the user will be redirected to any of the EC2 instances. But, henceforth, all requests from the same user will be redirected to the same EC2 instance. This ensures that all requests coming from the user during the session will be sent to the same application instance.
Q54. - (Topic 2)
A user has launched an EC2 instance from an instance store backed AMI. The infrastructure team wants to create an AMI from the running instance. Which of the below mentioned steps will not be performed while creating the AMI?
A. Define the AMI launch permissions
B. Upload the bundled volume
C. Register the AMI
D. Bundle the volume
Answer: A
Explanation:
When the user has launched an EC2 instance from an instance store backed AMI, it will need to follow certain steps, such as “Bundling the root volume”, “Uploading the bundled volume” and “Register the AMI”. Once the AMI is created the user can setup the launch permission. However, it is not required to setup during the launch.
Q55. - (Topic 3)
A user has a weighing plant. The user measures the weight of some goods every 5 minutes and sends data to AWS CloudWatch for monitoring and tracking. Which of the below mentioned parameters is mandatory for the user to include in the request list?
A. Value
B. Namespace
C. Metric Name
D. Timezone
Answer: B
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. The user has to always include the namespace as part of the request. The user can supply a file instead of the metric name. If the user does not supply the timezone, it accepts the current time. If the user is sending the data as a single data point it will have parameters, such as value. However, if the user is sending as an aggregate it will have parameters, such as statistic-values.
Q56. - (Topic 2)
A sys admin is trying to understand EBS snapshots. Which of the below mentioned statements will not be
useful to the admin to understand the concepts about a snapshot?
A. The snapshot is synchronous
B. It is recommended to stop the instance before taking a snapshot for consistent data
C. The snapshot is incremental
D. The snapshot captures the data that has been written to the hard disk when the snapshot command was executed
Answer: A
Explanation:
The AWS snapshot is a point in time backup of an EBS volume. When the snapshot command is executed it will capture the current state of the data that is written on the drive and take a backup. For a better and consistent snapshot of the root EBS volume, AWS recommends stopping the instance. For additional volumes it is recommended to unmount the device. The snapshots are asynchronous and incremental.