AWS Certified Developer Associate 1 Multiple Choice Questions And Correct Answers With Rationale.

AWS Certified Developer Associate 1 Multiple Choice Questions And Correct Answers With Rationale. A user is running a MySQL RDS instance. The user will not use the DB for the next 3 months. How can the user save costs? A. Pause the RDS activities from CLI until it is required in the future B. Stop the RDS instance C. Create a snapshot of RDS to launch in the future and terminate the instance now D. Change the instance size to micro Answer(s): C Explanation: The RDS instances unlike the AWS EBS backed instances cannot be stopped or paused. The user needs to take the final snapshot, terminate the instance and launch a new instance in the future from that snapshot. Reference: In DynamoDB, if you create a table and request 10 units of write capacity and 200 units of read capacity of provisioned throughput, how much would you be charged in US East (Northern Virginia) Region? A. $0.05 per hour B. $0.10 per hour C. $0.03 per hour D. $0.15 per hour Answer(s): A Explanation: To understand pricing in DynamoDB, consider the following example. If you create a table and request 10 units of write capacity and 200 units of read capacity of provisioned throughput, you would be charged: $0.01 + (4 x $0.01) = $0.05 per hour Reference: You have been doing a lot of testing of your VPC Network by deliberately failing EC2 instances to test whether instances are failing over properly. Your customer who will be paying the AWS bill for all this asks you if he is being charged for all these instances. You try to explain to him how the billing works on EC2 instances to the best of your knowledge. What would be an appropriate response to give to the customer in regards to this? A. Billing commences when Amazon EC2 AMI instance is completely up and billing ends as soon as the instance starts to shutdown. B. Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance and billing ends when the instance shuts down. C. Billing only commences only after 1 hour of uptime and billing ends when the instance terminates. D. Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance and billing ends as soon as the instance starts to shutdown. Answer(s): B Explanation: Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance. Billing ends when the instance shuts down, which could occur through a web services command, by running "shutdown -h", or through instance failure. Reference: AWS Elastic Load Balancer supports SSL termination. A. True. For specific availability zones only. B. False C. True. For specific regions only D. True. For all regions Answer(s): D Explanation: You can configure your load balancer in ELB (Elastic Load Balancing) to use a SSL certificate in order to improve your system security. The load balancer uses the certificate to terminate and then decrypt requests before sending them to the back-end instances. Elastic Load Balancing uses AWS Identity and Access Management (IAM) to upload your certificate to your load balancer. Reference: A user has launched five instances with ELB. How can the user add the sixth EC2 instance to ELB? A. The user can add the sixth instance on the fly. B. The user must stop the ELB and add the sixth instance. C. The user can add the instance and change the ELB config file. D. The ELB can only have a maximum of five instances. Answer(s): A Explanation: Elastic Load Balancing automatically distributes incoming traffic across multiple EC2 instances. You create a load balancer and register instances with the load balancer in one or more Availability Zones. The load balancer serves as a single point of contact for clients. This enables you to increase the availability of your application. You can add and remove EC2 instances from your load balancer as your needs change, without disrupting the overall flow of information. Reference: An organization has 500 employees. The organization wants to set up AWS access for each department. Which of the below mentioned options is a possible solution? A. Create IAM roles based on the permission and assign users to each role B. Create IAM users and provide individual permission to each C. Create IAM groups based on the permission and assign IAM users to the groups D. It is not possible to manage more than 100 IAM users with AWS Answer(s): C Explanation: An IAM group is a collection of IAM users. Groups let the user specify permissions for a collection of users, which can make it easier to manage the permissions for those users. Reference: How long can you keep your Amazon SQS messages in Amazon SQS queues? A. From 120 secs up to 4 weeks B. From 10 secs up to 7 days C. From 60 secs up to 2 weeks D. From 30 secs up to 1 week Answer(s): C Explanation: The SQS message retention period is configurable and can be set anywhere from 1 minute to 2 weeks. The default is 4 days and once the message retention limit is reached your messages will be automatically deleted. The option for longer message retention provides greater flexibility to allow for longer intervals between message production and consumption. Reference: In regard to DynamoDB, which of the following statements is correct? A. An Item should have at least two value sets, a primary key and another attribute. B. An Item can have more than one attributes. C. A primary key should be single-valued. D. An attribute can have one or several other attributes. Answer(s): B Explanation: In Amazon DynamoDB, a database is a collection of tables. A table is a collection of items and each item is a collection of attributes. Reference: Which one of the following statements is NOT an advantage of DynamoDB being built on Solid State Drives: A. serve high-scale request workloads B. low request pricing C. high I/O performance of WebApp on EC2 instance D. low-latency response times Answer(s): C Explanation: In DynamoDB, SSDs help achieve design goals of predictable low- latency response times for storing and accessing data at any scale. The high I/O performance of SSDs also enables to serve high-scale request workloads cost efficiently, and to pass this efficiency along in low request pricing. Reference: An organization has hosted an application on the EC2 instances. There will be multiple users connecting to the instance for setup and configuration of application. The organization is planning to implement certain security best practices. Which of the below mentioned pointers will not help the organization achieve better security arrangement? A. Apply the latest patch of OS and always keep it updated. B. Allow only IAM users to connect with the EC2 instances with their own secret access key. C. Disable the password based login for all the users. Al the users should use their own keys to connect with the instance securely. D. Create a procedure to revoke the access rights of the individual user when they are not required to connect to EC2 instance anymore for the purpose of application configuration. Answer(s): B Explanation: Since AWS is a public cloud any application hosted on EC2 is prone to hacker attacks. It becomes extremely important for a user to setup a proper security mechanism on the EC2 instances. A few of the security measures are listed below: Always keep the OS updated with the latest patch Always create separate users with in OS if they need to connect with the EC2 instances, create their keys and disable their password Create a procedure using which the admin can revoke the access of the user when the business work on the EC2 instance is completed Lock down unnecessary ports Audit any proprietary applications that the user may be running on the EC2 instance Provide temporary escalated privileges, such as sudo for users who need to perform occasional privileged tasks The IAM is useful when users are required to work with AWS resources and actions, such as launching an instance. It is not useful to connect (RDP / SSH) with an instance. Reference: A user is planning to make a mobile game which can be played online or offline and will be hosted on EC2. The user wants to ensure that if someone breaks the highest score or they achieve some milestone they can inform all their colleagues through email. Which of the below mentioned AWS services helps achieve this goal? A. AWS Simple Workflow Service. B. AWS Simple Queue Service. C. Amazon Cognito D. AWS Simple Email Service. Answer(s): D Explanation: Amazon Simple Email Service (Amazon SES) is a highly scalable and cost-effective email-sending service for businesses and developers. It integrates with other AWS services, making it easy to send emails from applications that are hosted on AWS. Reference: Which one of the following operations is NOT a DynamoDB operation? A. BatchWriteItem B. DescribeTable C. BatchGetItem D. BatchDeleteItem Answer(s): D Explanation: In DynamoDB, DeleteItem deletes a single item in a table by primary key, but BatchDeleteItem doesn't exist. Reference: True or False: In DynamoDB, Scan operations are always eventually consistent. A. No, a scan is like Query operation B. Yes C. No, a scan is strongly consistent by default D. No, you can optionally request a strongly consistent scan. Answer(s): B Explanation: In DynamoDB, Scan operations are always eventually consistent. Reference: Regarding Amazon SNS, when you want to subscribe to a topic and receive notifications to your email, in the Protocol drop-down box, you should select _______. A. Email B. Message C. SMTP D. IMAP Answer(s): A Explanation: In Amazon SNS, when you want to subscribe to a topic and receive notifications to your email, select Email in the Protocol drop-down box. Enter an email address you can use to receive the notification in the Endpoint field. Reference: In Amazon EC2, which of the following is the type of monitoring data for Amazon EBS volumes that is available automatically in 5-minute periods at no charge? A. Primary B. Basic C. Initial D. Detailed Answer(s): B Explanation: Basic is the type of monitoring data (for Amazon EBS volumes) which is available automatically in 5-minute periods at no charge called. Reference: In DynamoDB, to get a detailed listing of secondary indexes on a table, you can use the _____ action. A. DescribeTable B. BatchGetItem C. GetItem D. TableName Answer(s): A Explanation: In DynamoDB, DescribeTable returns information about the table, including the current status of the table, when it was created, the primary key schema, and any indexes on the table. Reference: A user has launched an EC2 instance. However, due to some reason the instance was terminated. If the user wants to find out the reason for termination, where can he find the details? A. The user can get information from the AWS console, by checking the Instance description under the State transition reason label B. The user can get information from the AWS console, by checking the Instance description under the Instance Termination reason label C. The user can get information from the AWS console, by checking the Instance description under the Instance Status Change reason label D. It is not possible to find the details after the instance is terminated Answer(s): A Explanation: An EC2 instance, once terminated, may be available in the AWS console for a while