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NEW QUESTION 31
A company recently launched a variety of new workloads on Amazon EC2 instances in its AWS account. The company needs to create a strategy to access and administer the instances remotely and securely. The company needs to implement a repeatable process that works with native AWS services and follows the AWS Well-Architected Framework.
Which solution will meet these requirements with the LEAST operational overhead?
Answer: B
Explanation:
https://docs.aws.amazon.com/systems-manager/latest/userguide/setup-launch-managed-instance.html
NEW QUESTION 32
A company runs a public three-Tier web application in a VPC The application runs on Amazon EC2 instances across multiple Availability Zones. The EC2 instances that run in private subnets need to communicate with a license server over the internet The company needs a managed solution that minimizes operational maintenance Which solution meets these requirements''
Answer: A
NEW QUESTION 33
A company hosted a web application on a Linux Amazon EC2 instance in the public subnet that uses a default network ACL. The instance uses a default security group and has an attached Elastic IP address. The network ACL has been configured to block all traffic to the instance. The Solutions Architect must allow incoming traffic on port 443 to access the application from any source.
Which combination of steps will accomplish this requirement? (Select TWO.)
Answer: A,C
Explanation:
To enable the connection to a service running on an instance, the associated network ACL must allow both inbound traffic on the port that the service is listening on as well as allow outbound traffic from ephemeral ports. When a client connects to a server, a random port from the ephemeral port range (1024-65535) becomes the client's source port.
The designated ephemeral port then becomes the destination port for return traffic from the service, so outbound traffic from the ephemeral port must be allowed in the network ACL. By default, network ACLs allow all inbound and outbound traffic. If your network ACL is more restrictive, then you need to explicitly allow traffic from the ephemeral port range.
The client that initiates the request chooses the ephemeral port range. The range varies depending on the client's operating system.
- Many Linux kernels (including the Amazon Linux kernel) use ports 32768-61000.
- Requests originating from Elastic Load Balancing use ports 1024-65535.
- Windows operating systems through Windows Server 2003 use ports 1025-5000.
- Windows Server 2008 and later versions use ports 49152-65535.
- A NAT gateway uses ports 1024-65535.
- AWS Lambda functions use ports 1024-65535.
For example, if a request comes into a web server in your VPC from a Windows 10 client on the Internet, your network ACL must have an outbound rule to enable traffic destined for ports 49152 - 65535. If an instance in your VPC is the client initiating a request, your network ACL must have an inbound rule to enable traffic destined for the ephemeral ports specific to the type of instance (Amazon Linux, Windows Server 2008, and so on).
In this scenario, you only need to allow the incoming traffic on port 443. Since security groups are stateful, you can apply any changes to an incoming rule and it will be automatically applied to the outgoing rule.
To enable the connection to a service running on an instance, the associated network ACL must allow both inbound traffic on the port that the service is listening on as well as allow outbound traffic from ephemeral ports. When a client connects to a server, a random port from the ephemeral port range (32768 - 65535) becomes the client's source port. Hence, the correct answers are:
- In the Security Group, add a new rule to allow TCP connection on port 443 from source 0.0.0.0/0.
- In the Network ACL, update the rule to allow inbound TCP connection on port 443 from source 0.0.0.0/0 and outbound TCP connection on port 32768 - 65535 to destination 0.0.0.0/0.
The option that says: In the Security Group, create a new rule to allow TCP connection on port 443 to destination 0.0.0.0/0 is incorrect because this step just allows outbound connections from the EC2 instance out to the public Internet which is unnecessary. Remember that a default security group already includes an outbound rule that allows all outbound traffic.
The option that says: In the Network ACL, update the rule to allow both inbound and outbound TCP connection on port 443 from source 0.0.0.0/0 and to destination 0.0.0.0/0 is incorrect because your network ACL must have an outbound rule to allow ephemeral ports (32768 - 65535). These are the specific ports that will be used as the client's source port for the traffic response.
The option that says: In the Network ACL, update the rule to allow outbound TCP connection on port 32768 - 65535 to destination 0.0.0.0/0 is incorrect because this step is just partially right. You still need to add an inbound rule from port 443 and not just the outbound rule for the ephemeral ports (32768 - 65535).
References:
https://aws.amazon.com/premiumsupport/knowledge-center/connect-http-https-ec2/
https://docs.amazonaws.cn/en_us/vpc/latest/userguide/vpc-network-acls.html#nacl-ephemeral-ports Check out this Amazon VPC Cheat Sheet:
https://tutorialsdojo.com/amazon-vpc/
NEW QUESTION 34
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