AWS-Certified-Developer-Associate Exam
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Q71. A user is trying to understand AWS SNS. To which of the below mentioned end points is SNS unable to send a notification?
A. AWS SES
B. Email JSON
C. AWS SQS
D. HTTP
Answer: A
Explanation:
Amazon Simple Notification Service (Amazon SNS) is a fast, filexible, and fully managed push messaging service. Amazon SNS can deliver notifications by SMS text message or email to the Amazon Simple Queue Service (SQS) queues or to any HTTP endpoint. The user can select one the following
transports as part of the subscription requests: "HTTP", "HTTPS","Emai|", "EmaiI-JSON", "SQS", "and SMS".
Reference: http://aws.amazon.com/sns/faqs/
Q72. How many types of block devices does Amazon EC2 support?
A. 5
B. 1
C. 2
D. 4
Answer: C
Explanation:
Amazon EC2 supports 2 types of block devices. Reference:
http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html
Q73. Can one instance be registered with two ELBs in the same region?
A. No
B. Yes, provided both ELBs have the same health check configuration
C. Yes, always
D. Yes, provided both ELBs are in the same AZ
Answer: C
Explanation:
Yes, it is possible to have one instance part of two separate ELBs, though both ELBs have different configurations. ELBs are never launched in specific zones.
Reference:
http://docs.aws.amazon.com/EIasticLoadBaIancing/latest/DeveIoperGuide/enable-disable-az.html
Q74. In regards to Amazon SQS how many times will you receive each message?
A. At least twice
B. Exactly once
C. As many times as you want
D. At least once
Answer: D
Explanation:
Amazon SQS is engineered to provide "at least once" delivery of all messages in its queues. Although most of the time, each message will be delivered to your application exactly once, you should design your system so that processing a message more than once does not create any errors or inconsistencies. Reference: https://aws.amazon.com/sqs/faqs/
Q75. A user is planning to create a structured database in the cloud. Which of the below mentioned AWS offerings help the user achieve the goal?
A. AWS DynamoDB
B. AWS RDS
C. AWS Simp|eDB
D. AWS RSD
Answer: B
Explanation:
AWS RDS is a managed database server offered by AWS, which makes it easy to set up, operate, and scale a relational database or structured data in cloud.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html
Q76. How does Amazon SQS allow multiple readers to access the same message queue without losing messages or processing them many times?
A. By identifying a user by his unique id
B. By using unique cryptography
C. Amazon SQS queue has a configurable visibility timeout.
D. MuItipIe readers can't access the same message queue
Answer: C
Explanation:
Every Amazon SQS queue has a configurable visibility timeout. For the designated amount of time after a message is read from a queue, it will not be visible to any other reader. As long as the amount of time that it takes to process the message is less than the visibility timeout, every message will be processed and deleted. In the event that the component processing the message fails or becomes unavailable, the message will again become visible to any component reading the queue once the visibility timeout ends. This allows you to have many components all reading messages from the same queue, with each working to process different messages.
Reference: https://aws.amazon.com/sqs/faqs/
Q77. A user is launching an AWS RDS with MySQL. Which of the below mentioned options allows the user to configure the INNODB engine parameters?
A. Options group
B. Engine parameters
C. Parameter groups
D. DB parameters
Answer: C
Explanation:
With regard to RDS, the user can manage the configuration of a DB engine by using a DB parameter group. A DB parameter group contains engine configuration values that can be applied to one or more DB instances of the same instance type.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html
Q78. A user has setup an application on EC2 which uses the IAM user access key and secret access key to make secure calls to S3. The user wants to temporarily stop the access to S3 for that IAM user. What should the root owner do?
A. Delete the IAM user
B. Change the access key and secret access key for the users
C. Disable the access keys for the IAM user
D. Stop the instance
Answer: C
Explanation:
If the user wants to temporarily stop the access to S3 the best solution is to disable the keys. Deleting the user will result in a loss of all the credentials and the app will not be useful in the future. If the user stops the instance IAM users can still access S3. The change of the key does not help either as they are still active. The best possible solution is to disable the keys.
Reference: http://docs.aws.amazon.com/IAM/latest/UserGuide/NIanagingCredentia|s.html
Q79. What is the maximum number of tags that a user can assign to an EC2 instance?
A. 50
B. 10
C. 5
D. 25
Answer: B
Explanation:
To help manage EC2 instances as well as their usage in a better way, the user can tag the instances. The tags are metadata assigned by the user which consists of a key and a value. One resource can have a maximum of 10 tags.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html
Q80. In relation to Amazon SQS, how can you ensure that messages are delivered in order?
A. Increase the size of your queue
B. Send them with a timestamp
C. Give each message a unique id.
D. AWS cannot guarantee that you will receive messages in the exact order you sent them
Answer: D
Explanation:
Amazon SQS makes a best effort to preserve order in messages, but due to the distributed nature of the queue, AWS cannot guarantee that you will receive messages in the exact order you sent them. You typically place sequencing information or timestamps in your messages so that you can reorder them upon receipt.
Reference: https://aws.amazon.com/items/1343?externaI|D=1343