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Amazon AWS Certified Advanced Networking Specialty (ANS-C00) Exam Sample Questions (Q113-Q118):

NEW QUESTION # 113
A Network Engineer is designing a new system on AWS that will take advantage of Amazon CloudFront for both content caching and for protecting the underlying origin. There is concern that an external agency might be able to access the IP addresses for the application's origin and then attack the origin despite it being served by CloudFront. Which of the following solutions provides the strongest level of protection to the origin?

• A. Configure an AWS [email protected] function to validate that the traffic to the Application Load Balancer originates from CloudFront.
• B. Configure CloudFront to use a custom header and configure an AWS WAF rule on the origin's Application Load Balancer to accept only traffic that contains that header.
• C. Attach an origin access identity to the CloudFront origin that allows traffic to the origin that originates from only CloudFront.
• D. Use an IP whitelist rule in AWS WAF within CloudFront to ensure that only known-client IPs are able to access the application.

Answer: B Explanation:
https://aws.amazon.com/vi/about-aws/whats-new/2016/01/amazon-cloudfront-adds-new-origin- security-features/ Add or modify request headers forwarded from CloudFront to your origin (launched Dec 28th):
Now you can configure CloudFront to add custom headers or override the value of existing request headers when CloudFront forwards requests to your origin. You can use these headers to help validate that requests made to your origin were sent from CloudFront (shared secret) and configure your origin to only allow requests that contain the custom header values that you specify. This feature also helps with setting up Cross-Origin Request Sharing (CORS) for your CloudFront distribution - you can configure CloudFront to always add custom headers to your origin to accommodate viewers that don't automatically include those headers in requests. It also allows you to disable varying on the Origin header, which improves your cache hit ratio, yet forward the appropriate headers so that your origin can respond with the CORS header.
NEW QUESTION # 114
What is the maximum size of a response body that Amazon CloudFront will return to the viewer?

• A. 100 MB
• B. 5 GB
• C. 20 GB
• D. Unlimited

Answer: C Explanation:
The maximum size of a response body that CloudFront will return to the viewer is 20 GB.
Reference:
http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/RequestAndRespon seBehaviorS3Origin.html#ResponseBehaviorS3Origin
NEW QUESTION # 115
A company has an application running in an Amazon VPC that must be able to communicate with on-premises resources in a data center. Network traffic between AWS and the data center will initially be minimal, but will increase to more than 10 Gbps over the next
few months. The company's goal is to launch the application as quickly as possible.
The Network Engineer has been asked to design a hybrid IT connectivity solution.
What should be done to meet these requirements?

• A. Provision a 100 Mbps AWS Direct Connect connection between an Amazon VPC and the data center, then submit a Direct Connect connection request. Later, cut over from the hosted connection to one or more Direct Connect connections, as needed.
• B. Provision an AWS VPN connection between an Amazon VPC and the data center, then submit an AWS Direct Connect connection request. Later, cut over from the VPN connection to one or more Direct Connect connections, as needed.
• C. Allocate elastic IPs to Amazon EC2 instances for temporary access to on-premises resources, then provision AWS VPN connections between an Amazon VPC and the data center.
• D. Submit a 1 Gbps AWS Direct Connect connection request, then increase the number of Direct Connect connections, as needed.

Answer: B
NEW QUESTION # 116
A company runs a large-scale application on a feel of Amazon EC2 instances that ate distributed across several VPCs. A Network Load Balancer (NLB) in a separate VPC routes traffic to the EC2 instances. The NLB's VPC is peered to all the application VPCs. The application must process millions of requests each minute during times of peak utilization. Users are reporting that the connections to the application are failing during peak times. Monitoring shows an increase in port allocation errors on the NLB.
Which action will solve this issue with the LEAST change to the architecture?

• A. Add a new target group to the same NLB listener
• B. Create an Application Load Balancer for the target group
• C. Change the target group type to 'instance"
• D. Increase the number of EC2 instances in the target group

Answer: A
NEW QUESTION # 117
Your company maintains an Amazon Route 53 private hosted zone. DNS resolution is restricted to a single, pre-existing VPC. For a new application deployment, you create an additional VPC in the same AWS account.
Both this new VPC and your on-premises DNS infrastructure must resolve records in the existing private hosted zone.
Which two activities are required to enable DNS resolution both within the new VPC and from the on-premises infrastructure? (Select two.)

• A. Launch Amazon EC2-based DNS proxies in the new VPC. Specify the proxies as forwarders in the onpremises DNS.
• B. Update the DHCP options set for the new VPC with the Route 53 nameserver IP addresses.
• C. Update the Route 53 private hosted zone's VPC associations to include the new VPC.
• D. Launch Amazon EC2-based DNS proxies in the new VPC. Specify the proxies in the DHCP options set.
• E. Update the on-premises DNS to include forwarders to the Route 53 nameserver IP addresses.

Answer: B,C
NEW QUESTION # 118
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