Free Amazon ANS-C01 Exam Questions

Question 1

A company is deploying a web application into two AWS Regions. The company has one VPC in each Region. Each VPC has three Amazon EC2 instances as web servers behind an Application Load Balancer (ALB). The company already has configured an Amazon Route 53 public hosted zone for example.com. Users will access the application by using the fully qualified domain name (FQDN) of app.example.com. The company needs a DNS solution that allows global users to access the application. The solution must route the users' requests to the Region that provides the lowest response time. The solution must fail over to the Region that provides the next-lowest response time if the application is unavailable in the initially intended Region. Which solution will meet these requirements?

A : For each ALB, create an A record that has a geolocation routing policy to route app.example.com to the IP addresses of the ALB. Configure a Route 53 HTTP health check that monitors each ALB by IP address. Associate the health check with the A records.

B : Create an A record that has a geolocation routing policy to route app.example.com to the IP addresses for both ALBs. Configure a Route 53 health check that monitors TCP port 80 for each ALB by IP address. Associate the health check with the A records.

C : Create an A record that has a latency-based routing policy to route app.example.com as an alias to one of the ALBs. Configure a Route 53 health check that monitors TCP port 80 for each ALB by IP address. Associate the health check with the A records.

D : For each ALB, create an A record that has a latency-based routing policy to route app.example.com as an alias to the ALB. Set the value for Evaluate Target Health to Yes for the records.

Answer: D

Question 2

A company is deploying a non-web application on an AWS load balancer. All targets are servers located on-premises that can be accessed by using AWS Direct Connect. The company wants to ensure that the source IP addresses of clients connecting to the application are passed all the way to the end server.

How can this requirement be achieved?

A : a Network Load Balancer to automatically preserve the source IP address.

B : a Network Load Balancer and enable the X-Forwarded-For attribute.

C : a Network Load Balancer and enable the ProxyProtocol v2 attribute.

D : an Application Load Balancer to automatically preserve the source IP address in the X-Forwarded-For header.

Answer: C

Question 3

A company has been using an outdated application layer protocol for communication among applications. The company decides not to use this protocol anymore and must migrate all applications to support a new protocol. The old protocol and the new protocol are TCP-based, but the protocols use different port numbers. After several months of work, the company has migrated dozens of applications that run on Amazon EC2 instances and in containers. The company believes that all the applications have been migrated, but the company wants to verify this belief. A network engineer needs to verify that no application is still using the old protocol. Which solution will meet these requirements without causing any downtime?

A : Amazon Inspector and its Network Reachability rules package. Wait until the analysis has finished running to find out which EC2 instances are still listening to the old port.

B : able Amazon GuardDuty. Use the graphical visualizations to filter for traffic that uses the port of the old protocol. Exclude all internet traffic to filter out occasions when the same port is used as an ephemeral port.

C : nfigure VPC flow logs to be delivered into an Amazon S3 bucket. Use Amazon Athena to query the data and to filter for the port number that is used by the old protocol.

D : pect all security groups that are assigned to the EC2 instances that host the applications. Remove the port of the old protocol if that port is in the list of allowed ports. Verify that the applications are operating properly after the port is removed from the security groups.

Answer: C

Question 4

Your company has set up AWS Direct Connect to connect on-premises to an Amazon VPC instance. Two Direct Connect connections terminate at two different Direct Connect locations. You are using two routers, R1 and R2, at your end (one of each Direct Connect connection). R1 and R2 do NOT have connectivity between them. Both routers advertise the same routers over BGP to the VGW. You have a stateful firewall on each router. The routers drop some of the traffic coming from the VPC.

Which two actions should you take to fix this problem? (Select two.)

A : BGP AS prepend attribute to prepend additional AS numbers while advertising routers from R1 to VGW.

B : BGP local preference attribute to assign R1 to a lower local preference number than R2.

C : BGP local preference attribute to assign R1 a higher local preference number than R2.

D : BGP MED attribute to assign a higher MED value to the routes advertised R1 to VGW.

E : BGP MED attribute to assign a higher MED value to the routes advertised from R2 to VGW.

Answer: A,D

Question 5

A company is planning to migrate to AWS and use multiple VPCs in multiple AWS Regions. A network engineer must connect the eu-west-1 and eu-central-1 Regions to the company headquarters and branch office, respectively. The network engineer created a production VPC, named Prod A, with a CIDR block of 10.0.0.0. Prod A runs in an account in eu-west-1. The network engineer then created another production VPC, named Prod B, with a CIDR block of 10.1.0.0. Prod Ð’ runs in a different account in eu-central-1. The network engineer performed the following steps to try to achieve the required connectivity: 1. Created one transit gateway in each Region2. Shared and accepted the transit gateways with the production accounts in both Regions3. Configured the peering attachment between both transit gateways4. Attached both VPCs to the respective Region transit gateway5. Created both transit gateway route tables and associated the attachments with the route tables6. Configured a static route in both transit gateway route tables to send traffic to the remote VPC in the other Region7. Activated route propagation on the VPC route tables in each Region After the configuration, the network engineer tried to connect from Prod A to Prod B. However, the connection was unsuccessful. What should the network engineer do to achieve the required connectivity?

A : Modify the IP address of the peering attachment to a wider range.

B : Delete the static routes that were in the transit gateway route table to send traffic to the remote VPC and enable route propagation instead.

C : Create a new route destined to 10.0.0.0 in both production VPC route tables with the Region transit gateway as the target.

D : Modify the transit gateway route tables from the production accounts to propagate routes dynamically between the production VPCs.

Answer: C