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>> Original SAA-C03 Questions <<
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Amazon AWS Certified Solutions Architect - Associate (SAA-C03) Exam Sample Questions (Q233-Q238):
NEW QUESTION # 233
An aerospace engineering company recently adopted a hybrid cloud infrastructure with AWS. One of the Solutions Architect's tasks is to launch a VPC with both public and private subnets for their EC2 instances as well as their database instances.
Which of the following statements are true regarding Amazon VPC subnets? (Select TWO.)
- A. Each subnet spans to 2 Availability Zones.
- B. Every subnet that you create is automatically associated with the main route table for the VPC.
- C. EC2 instances in a private subnet can communicate with the Internet only if they have an Elastic IP.
- D. Each subnet maps to a single Availability Zone.
- E. The allowed block size in VPC is between a /16 netmask (65,536 IP addresses) and /27 netmask (32 IP addresses).
Answer: B,D
Explanation:
A VPC spans all the Availability Zones in the region. After creating a VPC, you can add one or more subnets in each Availability Zone. When you create a subnet, you specify the CIDR block for the subnet, which is a subset of the VPC CIDR block. Each subnet must reside entirely within one Availability Zone and cannot span zones. Availability Zones are distinct locations that are engineered to be isolated from failures in other Availability Zones. By launching instances in separate Availability Zones, you can protect your applications from the failure of a single location.
Below are the important points you have to remember about subnets:
- Each subnet maps to a single Availability Zone.
- Every subnet that you create is automatically associated with the main route table for the VPC.
- If a subnet's traffic is routed to an Internet gateway, the subnet is known as a public subnet.
The option that says: EC2 instances in a private subnet can communicate with the Internet only if they have an Elastic IP is incorrect. EC2 instances in a private subnet can communicate with the Internet not just by having an Elastic IP, but also with a public IP address via a NAT Instance or a NAT Gateway. Take note that there is a distinction between private and public IP addresses. To enable communication with the Internet, a public IPv4 address is mapped to the primary private IPv4 address through network address translation (NAT).
The option that says: The allowed block size in VPC is between a /16 netmask (65,536 IP addresses) and /27 netmask (32 IP addresses) is incorrect because the allowed block size in VPC is between a /16 netmask (65,536 IP addresses) and /28 netmask (16 IP addresses) and not /27 netmask.
The option that says: Each subnet spans to 2 Availability Zones is incorrect because each subnet must reside entirely within one Availability Zone and cannot span zones. References:
https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-ip-addressing.html Check out this Amazon VPC Cheat Sheet: https://tutorialsdojo.com/amazon-vpc/ Tutorials Dojo's AWS Certified Solutions Architect Associate Exam Study Guide:
https://tutorialsdojo.com/aws-certified-solutions-architect-associate/
NEW QUESTION # 234
A health organization is using a large Dedicated EC2 instance with multiple EBS volumes to host its health records web application. The EBS volumes must be encrypted due to the confidentiality of the data that they are handling and also to comply with the HIPAA (Health Insurance Portability and Accountability Act) standard.
In EBS encryption, what service does AWS use to secure the volume's data at rest? (Select TWO.)
- A. By using a password stored in CloudHSM.
- B. By using the SSL certificates provided by the AWS Certificate Manager (ACM).
- C. By using S3 Client-Side Encryption.
- D. By using your own keys in AWS Key Management Service (KMS).
- E. By using S3 Server-Side Encryption.
- F. By using Amazon-managed keys in AWS Key Management Service (KMS).
Answer: D,F
Explanation:
Amazon EBS encryption offers seamless encryption of EBS data volumes, boot volumes, and snapshots, eliminating the need to build and maintain a secure key management infrastructure. EBS encryption enables data at rest security by encrypting your data using Amazon-managed keys, or keys you create and manage using the AWS Key Management Service (KMS). The encryption occurs on the servers that host EC2 instances, providing encryption of data as it moves between EC2 instances and EBS storage.
Hence, the correct answers are: using your own keys in AWS Key Management Service (KMS) and using Amazon-managed keys in AWS Key Management Service (KMS).
Using S3 Server-Side Encryption and using S3 Client-Side Encryption are both incorrect as these relate only to S3.
Using a password stored in CloudHSM is incorrect as you only store keys in CloudHSM and not passwords.
Using the SSL certificates provided by the AWS Certificate Manager (ACM) is incorrect as ACM only provides SSL certificates and not data encryption of EBS Volumes.
Reference:
https://aws.amazon.com/ebs/faqs/
Check out this Amazon EBS Cheat Sheet:
https://tutorialsdojo.com/amazon-ebs/
NEW QUESTION # 235
A company plans to migrate its on-premises workload to AWS. The current architecture is composed of a Microsoft SharePoint server that uses a Windows shared file storage. The Solutions Architect needs to use a cloud storage solution that is highly available and can be integrated with Active Directory for access control and authentication.
Which of the following options can satisfy the given requirement?
- A. Create a file system using Amazon FSx for Windows File Server and join it to an Active Directory domain in AWS.
- B. Launch an Amazon EC2 Windows Server to mount a new S3 bucket as a file volume.
- C. Create a file system using Amazon EFS and join it to an Active Directory domain.
- D. Create a Network File System (NFS) file share using AWS Storage Gateway.
Answer: A
Explanation:
Amazon FSx for Windows File Server provides fully managed, highly reliable, and scalable file storage that is accessible over the industry-standard Service Message Block (SMB) protocol. It is built on Windows Server, delivering a wide range of administrative features such as user quotas, end-user file restore, and Microsoft Active Directory (AD) integration. Amazon FSx is accessible from Windows, Linux, and MacOS compute instances and devices. Thousands of compute instances and devices can access a file system concurrently.
Amazon FSx works with Microsoft Active Directory to integrate with your existing Microsoft Windows environments. You have two options to provide user authentication and access control for your file system: AWS Managed Microsoft Active Directory and Self-managed Microsoft Active Directory.
Take note that after you create an Active Directory configuration for a file system, you can't change that configuration. However, you can create a new file system from a backup and change the Active Directory integration configuration for that file system. These configurations allow the users in your domain to use their existing identity to access the Amazon FSx file system and to control access to individual files and folders.
Hence, the correct answer is: Create a file system using Amazon FSx for Windows File Server and join it to an Active Directory domain in AWS.
The option that says: Create a file system using Amazon EFS and join it to an Active Directory domain is incorrect because Amazon EFS does not support Windows systems, only Linux OS. You should use Amazon FSx for Windows File Server instead to satisfy the requirement in the scenario.
The option that says: Launch an Amazon EC2 Windows Server to mount a new S3 bucket as a file volume is incorrect because you can't integrate Amazon S3 with your existing Active Directory to provide authentication and access control.
The option that says: Create a Network File System (NFS) file share using AWS Storage Gateway is incorrect because NFS file share is mainly used for Linux systems. Remember that the requirement in the scenario is to use a Windows shared file storage. Therefore, you must use an SMB file share instead, which supports Windows OS and Active Directory configuration. Alternatively, you can also use the Amazon FSx for Windows File Server file system. References:
https://docs.aws.amazon.com/fsx/latest/WindowsGuide/aws-ad-integration-fsxW.html
https://aws.amazon.com/fsx/windows/faqs/
https://docs.aws.amazon.com/storagegateway/latest/userguide/CreatingAnSMBFileShare.html Check out this Amazon FSx Cheat Sheet:
https://tutorialsdojo.com/amazon-fsx/
NEW QUESTION # 236
A company has two On-Demand EC2 instances inside the Virtual Private Cloud in the same Availability Zone but are deployed to different subnets. One EC2 instance is running a database and the other EC2 instance a web application that connects with the database. You need to ensure that these two instances can communicate with each other for the system to work properly.
What are the things you have to check so that these EC2 instances can communicate inside the VPC?
(Select TWO.)
- A. Ensure that the EC2 instances are in the same Placement Group.
- B. Check if all security groups are set to allow the application host to communicate to the database on the right port and protocol.
- C. Check if the default route is set to a NAT instance or Internet Gateway (IGW) for them to communicate.
- D. Check if both instances are the same instance class.
- E. Check the Network ACL if it allows communication between the two subnets.
Answer: B,E
Explanation:
First, the Network ACL should be properly set to allow communication between the two subnets. The security group should also be properly configured so that your web server can communicate with the database server.
Hence, these are the correct answers:
Check if all security groups are set to allow the application host to communicate to the database on the right port and protocol.
Check the Network ACL if it allows communication between the two subnets.
The option that says: Check if both instances are the same instance class is incorrect because the EC2 instances do not need to be of the same class in order to communicate with each other.
The option that says: Check if the default route is set to a NAT instance or Internet Gateway (IGW) for them to communicate is incorrect because an Internet gateway is primarily used to communicate to the Internet.
The option that says: Ensure that the EC2 instances are in the same Placement Group is incorrect because Placement Group is mainly used to provide low-latency network performance necessary for tightly-coupled node-to-node communication.
Explanation:
Reference:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html Check out this Amazon VPC Cheat Sheet: https://tutorialsdojo.com/amazon-vpc/ Tutorials Dojo's AWS Certified Solutions Architect Associate Exam Study Guide:
https://tutorialsdojo.com/aws-certified-solutions-architect-associate/
NEW QUESTION # 237
A company has a web-based ticketing service that utilizes Amazon SQS and a fleet of EC2 instances.
The EC2 instances that consume messages from the SQS queue are configured to poll the queue as often as possible to keep end-to-end throughput as high as possible. The Solutions Architect noticed that polling the queue in tight loops is using unnecessary CPU cycles, resulting in increased operational costs due to empty responses.
In this scenario, what should the Solutions Architect do to make the system more cost-effective?
- A. Configure Amazon SQS to use short polling by setting the ReceiveMessageWaitTimeSeconds to zero.
- B. Configure Amazon SQS to use long polling by setting the ReceiveMessageWaitTimeSeconds to zero.
- C. Configure Amazon SQS to use short polling by setting the ReceiveMessageWaitTimeSeconds to a number greater than zero.
- D. Configure Amazon SQS to use long polling by setting the ReceiveMessageWaitTimeSeconds to a number greater than zero.
Answer: D
Explanation:
In this scenario, the application is deployed in a fleet of EC2 instances that are polling messages from a single SQS queue. Amazon SQS uses short polling by default, querying only a subset of the servers (based on a weighted random distribution) to determine whether any messages are available for inclusion in the response. Short polling works for scenarios that require higher throughput. However, you can also configure the queue to use Long polling instead, to reduce cost.
The ReceiveMessageWaitTimeSeconds is the queue attribute that determines whether you are using Short or Long polling. By default, its value is zero which means it is using Short polling. If it is set to a value greater than zero, then it is Long polling.
Hence, configuring Amazon SQS to use long polling by setting the ReceiveMessageWaitTimeSeconds to a number greater than zero is the correct answer. Quick facts about SQS Long Polling:
- Long polling helps reduce your cost of using Amazon SQS by reducing the number of empty responses when there are no messages available to return in reply to a ReceiveMessage request sent to an Amazon SQS queue and eliminating false empty responses when messages are available in the queue but aren't included in the response.
- Long polling reduces the number of empty responses by allowing Amazon SQS to wait until a message is available in the queue before sending a response. Unless the connection times out, the response to the ReceiveMessage request contains at least one of the available messages, up to the maximum number of messages specified in the ReceiveMessage action.
- Long polling eliminates false empty responses by querying all (rather than a limited number) of the servers. Long polling returns messages as soon any message becomes available.
Explanation:
Reference: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs- long-polling.ht ml Check out this Amazon SQS Cheat Sheet: https://tutorialsdojo.com/amazon-sqs/
NEW QUESTION # 238
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