Question

Given the following network address translation (NAT) topology, identify the IP address that is the outside global IP address. (NOTE: To avoid using an organization's actual IP addresses in this question, all IP addresses are technically private IP addresses. However, assume that the network and the IP address are publicly routable.)

a) 192.168.1.1
b) 10.0.0.1
c) 172.16.1.1
d) 203.0.113.1

Answer 1

The outside global IP address in the NAT topology provided in the question is 203.0.113.1, as the other listed addresses are private and not publicly routable.

Step-by-step explanation:

The outside global IP address in a network address translation (NAT) topology is the IP address that is used to identify a device to external networks and is how the device is seen on the wider internet. In the context of the given options, the IP addresses (a) 192.168.1.1, (b) 10.0.0.1, and (c) 172.16.1.1 are all from private IP ranges and are not publicly routable. The IP address (d) 203.0.113.1 is part of the TEST-NET-3 block that is commonly used in documentation and is designed to be publicly routable for the purposes of examples. Assuming that the network and the IP address are publicly routable as mentioned in the question, the address 203.0.113.1 would be classified as the outside global IP address.