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NEW QUESTION 47
A company recently migrated its Amazon EC2 instances to VPC private subnets to satisfy a security compliance requirement. The EC2 instances now use a NAT gateway tor internet access. After the migration, some long-running database queries from private EC2 instances to a publicly accessible third-party database no longer receive responses. The database query logs reveal that the queries successfully completed after 7 minutes but that the client EC2 instances never received the response. Which configuration change should a network engineer implement to resolve this issue?

A. Enable enhanced networking on the client EC2 instancesB. Configure the NAT gateway timeout to allow connections for up to 600 secondsC. Enable TCP keepalive on the client EC2 instances with a value of less than 300 secondsD. Close idle TCP connections though the NAT gateway

Answer: C

 

NEW QUESTION 48
A company has 225 mobile and desktop devices and 300 partner VPNs that need access to an AWS VPC.
VPN users should not be able to reach one another. Which approach will meet the technical and security requirements while minimizing costs?

A. Use the AWS IPsec VPN for the partner VPN connections. Use an Amazon EC2 instance VPN for the mobile and desktop devices. Use Network ACLs and security groups to maintain routing separation.B. Use an Amazon EC2 instance VPN for the desktop, mobile, and partner VPN connections. Use features of the VPN instance to limit routing and connectivity.C. Use the AWS IPsec VPN for the mobile, desktop, and partner VPN connections. Use network access control lists (Network ACLs) and security groups to maintain routing separation.D. Create an AWS Direct Connect connection between on-premises and AWS Use a public virtual interface to connect to the AWS IPsec VPN for the mobile, desktop, and partner VPN connections.

Answer: A

 

NEW QUESTION 49
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.

A. The NAT gateway is launched in a private subnet.B. The authentication server is not accepting traffic.C. The NAT gateway does not support UDP traffic.D. The NAT gateway cannot allocate more ports.

Answer: D

Explanation:
Ref: https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html
"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. For more information, see Monitoring NAT Gateways Using Amazon CloudWatch."

 

NEW QUESTION 50
A legacy, on-premises web application cannot be load balances effectively. There are both planned and unplanned events that cause usage spikes to millions of concurrent users. The existing infrastructure cannot handle the usage spikes. The CIO has mandated that the application be moved to the cloud to avoid further disruptions, with the additional requirement that source IP addresses be unaltered to support network traffic monitoring needs. Which of the following designs will meet these requirements?

A. Use an Auto Scaling group of Amazon EC2 instances behind a Classic Load Balancer.B. Use an Auto Scaling group of EC2 instances in a target group behind a Classic Load Balancer.C. Use an Auto Scaling group of EC2 instances in a target group behind a Network Load Balancer.D. Use an Auto Scaling group of EC2 instances in a target group behind an Application Load Balancer.

Answer: C

 

NEW QUESTION 51
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