Watchguard Network Security Practice Test

If you want all traffic from your privately addressed email server to appear to come from a specific public IP address, which NAT option should you use?

1. Select dynamic NAT for all traffic in the SMTP policy and set the source IP address.

2. Create a global dynamic NAT rule for traffic from the email server.

3. Create a static NAT action for traffic to the email server.

4. Configure a port forwarding rule for the email server.

The correct answer is: Create a global dynamic NAT rule for traffic from the email server.

The use of global dynamic NAT is the most appropriate option for ensuring that all traffic from your privately addressed email server appears to come from a specific public IP address. This method allows for the translation of internal IP addresses to a single external address, maintaining a consistent outbound identity. When you implement a global dynamic NAT rule, you can specify a range of internal IPs, like that of your email server, to be mapped to a designated public IP. This effectively makes all outbound traffic from that server appear to originate from the defined public IP, which is valuable for maintaining consistent routing paths, enhancing security, and avoiding delivery issues with external services such as spam filters that scrutinize the originating IP. By contrast, static NAT would be used for scenarios where you want a specific internal address to be consistently mapped to a specific external address, but this does not adjust dynamically and is usually best for services that need to be directly accessed from the outside. Port forwarding is suitable for directing external traffic to specific services on your internal server, but does not inherently manage the source IP of outgoing traffic. Dynamic NAT for all traffic would not guarantee that all outbound connections appear from a single specified public IP, as it typically assigns an available public IP from a pool based on availability. Thus