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The ANS-C01 exam covers a wide range of topics, including designing and implementing advanced network architectures on AWS, implementing automation for network tasks, and designing and implementing secure network solutions. ANS-C01 Exam also covers topics such as connectivity options, network optimization, and troubleshooting network issues.
NEW QUESTION # 57
A company is planning to migrate an internal application to the AWS Cloud. The application will run on Amazon EC2 instances in one VPC. Users will access the application from the company's on-premises data center through AWS VPN or AWS Direct Connect. Users will use private domain names for the application endpoint from a domain name that is reserved explicitly for use in the AWS Cloud.
Each EC2 instance must have automatic failover to another EC2 instance in the same AWS account and the same VPC. A network engineer must design a DNS solution that will not expose the application to the internet.
Which solution will meet these requirements?
Answer: B
Explanation:
The correct solution is to use a Route 53 private hosted zone and a Route 53 Resolver inbound endpoint. A private hosted zone allows you to use private domain names for your internal AWS resources without exposing them to the internet. A Route 53 Resolver inbound endpoint enables DNS queries from your on-premises network to be forwarded to your VPC. By configuring conditional forwarding on your on-premises DNS resolvers, you can ensure that only the queries for the AWS reserved domain name are sent to the inbound endpoint. In the private hosted zone, you can create primary and failover records that point to the IP addresses of the EC2 instances. These records will automatically switch to the failover instance if the primary instance becomes unhealthy. You can use CloudWatch metrics and alarms to monitor the application's health and trigger the health check for the primary endpoint.
The other options are not correct because they either expose the application to the internet or use a public hosted zone, which is not suitable for internal applications. Option A assigns public IP addresses to the EC2 instances, which makes them accessible from the internet. Option B uses a public hosted zone, which requires the EC2 instances to have public IP addresses or elastic IP addresses. Option D does not set up a health check on the alarm for the primary endpoint, which is required for the failover mechanism to work.
NEW QUESTION # 58
Which of the following allows you to restrict access to your Amazon Simple Storage Service (Amazon S3) bucket to Amazon CloudFront distributions that you control?
Response:
Answer: B
NEW QUESTION # 59
All IP addresses within a 10.0.0.0/16 VPC are fully utilized with application servers across two Availability Zones. The application servers need to send frequent UDP probes to a single central authentication server on the Internet to confirm that is running up-to-date packages. The network is designed for application servers to use a single NAT gateway for internal access. Testing reveals that a few of the servers are unable to communicate with the authentication server.
Answer: D
Explanation:
A NAT gateway can support up to 55,000 simultaneous connections to each unique destination.
This limit also applies if you create approximately 900 connections per second to a single destination (about 55,000 connections per minute). If the destination IP address, the destination port, or the protocol (TCP/UDP/ICMP) changes, you can create an additional 55,000 connections.
For more than 55,000 connections, there is an increased chance of connection errors due to port allocation errors. These errors can be monitored by viewing the ErrorPortAllocation CloudWatch metric for your NAT gateway.
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html
NEW QUESTION # 60
A company uses Amazon Route 53 for its DNS needs. The company's security team wants to update the DNS infrastructure to provide the most recent security posture.
The security team has configured DNS Security Extensions (DNSSEC) for the domain. The security team wants a network engineer to explain who is responsible for the rotation of DNSSEC keys.
Which explanation should the network administrator provide to the security team?
Answer: A
Explanation:
You are responsible for KSK management, which includes rotating it if needed. ZSK management is performed by Route 53.
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-configuring-dnssec.html
NEW QUESTION # 61
A company's application is deployed on Amazon EC2 instances in a single VPC in an AWS Region. The EC2 instances are running in two Availability Zones. The company decides to use a fleet of traffic inspection instances from AWS Marketplace to inspect traffic between the VPC and the internet. The company is performing tests before the company deploys the architecture into production.
The fleet is located in a shared inspection VPC behind a Gateway Load Balancer (GWLB). To minimize the cost of the solution, the company deployed only one inspection instance in each Availability Zone that the application uses.
During tests, a network engineer notices that traffic inspection works as expected when the network is stable. However, during maintenance of the inspection instances, the internet sessions time out for some application instances. The application instances are not able to establish new sessions.
Which combination of steps will remediate these issues? (Choose two.)
Answer: A,B
Explanation:
https://aws.amazon.com/blogs/networking-and-content-delivery/centralized-inspection- architecture-with-aws-gateway-load-balancer-and-aws-transit-gateway/
NEW QUESTION # 62
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