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NEW QUESTION 26
A company’s HTTP application is behind a Network Load Balancer (NLB). The NLB’s target group is configured to use an Amazon EC2 Auto Scaling group with multiple EC2 instances that run the web service.
The company notices that the NLB is not detecting HTTP errors for the application. These errors require a manual restart of the EC2 instances that run the web service. The company needs to improve the application’s availability without writing custom scripts or code.
What should a solutions architect do to meet these requirements?
- A. Create an Amazon Cloud Watch alarm that monitors the UnhealthyHostCount metric for the NLB.
Configure an Auto Scaling action to replace unhealthy instances when the alarm is in the ALARM state. - B. Add a cron job to the EC2 instances to check the local application’s logs once each minute. If HTTP errors are detected, the application will restart.
- C. Replace the NLB with an Application Load Balancer. Enable HTTP health checks by supplying the URL of the company’s application. Configure an Auto Scaling action to replace unhealthy instances.
- D. Enable HTTP health checks on the NLB. supplying the URL of the company’s application.
Answer: C
NEW QUESTION 27
A newly hired Solutions Architect is checking all of the security groups and network access control list rules of the company’s AWS resources. For security purposes, the MS SQL connection via port 1433 of the database tier should be secured. Below is the security group configuration of their Microsoft SQL Server database:
The application tier hosted in an Auto Scaling group of EC2 instances is the only identified resource that needs to connect to the database. The Architect should ensure that the architecture complies with the best practice of granting least privilege.
Which of the following changes should be made to the security group configuration?
- A. For the MS SQL rule, change the Source to the static AnyCast IP address attached to the application tier.
- B. For the MS SQL rule, change the Source to the security group ID attached to the application tier.
- C. For the MS SQL rule, change the Source to the Network ACL ID attached to the application tier.
- D. For the MS SQL rule, change the Source to the EC2 instance IDs of the underlying instances of the Auto Scaling group.
Answer: B
Explanation:
A security group acts as a virtual firewall for your instance to control inbound and outbound traffic. When you launch an instance in a VPC, you can assign up to five security groups to the instance. Security groups act at the instance level, not the subnet level. Therefore, each instance in a subnet in your VPC can be assigned to a different set of security groups.
If you launch an instance using the Amazon EC2 API or a command line tool and you don’t specify a security group, the instance is automatically assigned to the default security group for the VPC. If you launch an instance using the Amazon EC2 console, you have an option to create a new security group for the instance.
For each security group, you add rules that control the inbound traffic to instances, and a separate set of rules that control the outbound traffic. This section describes the basic things that you need to know about security groups for your VPC and their rules.
Amazon security groups and network ACLs don’t filter traffic to or from link-local addresses (169.254.0.0/16) or AWS reserved IPv4 addresses (these are the first four IPv4 addresses of the subnet, including the Amazon DNS server address for the VPC). Similarly, flow logs do not capture IP traffic to or from these addresses.
In the scenario, the security group configuration allows any server (0.0.0.0/0) from anywhere to establish an MS SQL connection to the database via the 1433 port. The most suitable solution here is to change the Source field to the security group ID attached to the application tier.
Hence, the correct answer is the option that says: For the MS SQL rule, change the Source to the security group ID attached to the application tier.
The option that says: For the MS SQL rule, change the Source to the EC2 instance IDs of the underlying instances of the Auto Scaling group is incorrect because using the EC2 instance IDs of the underlying instances of the Auto Scaling group as the source can cause intermittent issues. New instances will be added and old instances will be removed from the Auto Scaling group over time, which means that you have to manually update the security group setting once again. A better solution is to use the security group ID of the Auto Scaling group of EC2 instances.
The option that says: For the MS SQL rule, change the Source to the static AnyCast IP address attached to the application tier is incorrect because a static AnyCast IP address is primarily used for AWS Global Accelerator and not for security group configurations.
The option that says: For the MS SQL rule, change the Source to the Network ACL ID attached to the application tier is incorrect because you have to use the security group ID instead of the Network ACL ID of the application tier. Take note that the Network ACL covers the entire subnet which means that other applications that use the same subnet will also be affected. References:
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Security.html
NEW QUESTION 28
One member of your DevOps team consulted you about a connectivity problem in one of your Amazon EC2 instances. The application architecture is initially set up with four EC2 instances, each with an EIP address that all belong to a public non-default subnet. You launched another instance to handle the increasing workload of your application. The EC2 instances also belong to the same security group.
Everything works well as expected except for one of the EC2 instances which is not able to send nor receive traffic over the Internet.
Which of the following is the MOST likely reason for this issue?
- A. The EC2 instance is running in an Availability Zone that is not connected to an Internet gateway.
- B. The EC2 instance does not have a public IP address associated with it.
- C. The route table is not properly configured to allow traffic to and from the Internet through the Internet gateway.
- D. The EC2 instance does not have a private IP address associated with it.
Answer: B
Explanation:
IP addresses enable resources in your VPC to communicate with each other and with resources over the Internet. Amazon EC2 and Amazon VPC support the IPv4 and IPv6 addressing protocols.
By default, Amazon EC2 and Amazon VPC use the IPv4 addressing protocol. When you create a VPC, you must assign it an IPv4 CIDR block (a range of private IPv4 addresses). Private IPv4 addresses are not reachable over the Internet. To connect to your instance over the Internet or to enable communication between your instances and other AWS services that have public endpoints, you can assign a globally-unique public IPv4 address to your instance.
You can optionally associate an IPv6 CIDR block with your VPC and subnets and assign IPv6 addresses from that block to the resources in your VPC. IPv6 addresses are public and reachable over the Internet.
All subnets have a modifiable attribute that determines whether a network interface created in that subnet is assigned a public IPv4 address and, if applicable, an IPv6 address. This includes the primary network interface (eth0) that’s created for an instance when you launch an instance in that subnet.
Regardless of the subnet attribute, you can still override this setting for a specific instance during launch.
By default, nondefault subnets have the IPv4 public addressing attribute set to false, and default subnets have this attribute set to true. An exception is a nondefault subnet created by the Amazon EC2 launch instance wizard – the wizard sets the attribute to true. You can modify this attribute using the Amazon VPC console.
In this scenario, there are 5 EC2 instances that belong to the same security group that should be able to connect to the Internet. The main route table is properly configured but there is a problem connecting to one instance. Since the other four instances are working fine, we can assume that the security group and the route table are correctly configured. One possible reason for this issue is that the problematic instance does not have a public or an EIP address.
Take note as well that the four EC2 instances all belong to a public non-default subnet. This means that a new EC2 instance will not have a public IP address by default since the since IPv4 public addressing attribute is initially set to false.
Hence, the correct answer is the option that says: The EC2 instance does not have a public IP address associated with it.
The option that says: The route table is not properly configured to allow traffic to and from the Internet through the Internet gateway is incorrect because the other three instances, which are associated with the same route table and security group, do not have any issues.
The option that says: The EC2 instance is running in an Availability Zone that is not connected to an Internet gateway is incorrect because there is no relationship between the Availability Zone and the Internet Gateway (IGW) that may have caused the issue. References:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario1.html
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-ip-addressing.html#vpc-ip-addressing-subnet Check out this Amazon VPC Cheat Sheet:
https://tutorialsdojo.com/amazon-vpc/
NEW QUESTION 29
A company uses AWS Organizations to create dedicated AWS accounts for each business unit to manage each business unit’s account independently upon request. The root email recipient missed a notification that was sent to the root user email address of one account. The company wants to ensure that all future notifications are not missed. Future notifications must be limited to account administrators.
Which solution will meet these requirements?
- A. Configure all AWS account root user email addresses as distribution lists that go to a few administrators who can respond to alerts. Configure AWS account alternate contacts in the AWS Organizations console or programmatically.
- B. Configure all existing AWS accounts and all newly created accounts to use the same root user email address. Configure AWS account alternate contacts in the AWS Organizations console or programmatically.
- C. Configure the company’s email server to forward notification email messages that are sent to the AWS account root user email address to all users in the organization.
- D. Configure all AWS account root user email messages to be sent to one administrator who is responsible for monitoring alerts and forwarding those alerts to the appropriate groups.
Answer: B
NEW QUESTION 30
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