Discussion
Which of the following would be good reasons to run NAT?
1.You need to connect to the Internet and your hosts don't have globally unique IP addresses.
2.You change to a new ISP that requires you to renumber your network.
3.You don't want any hosts connecting to the Internet.
4.You require two intranets with duplicate addresses to merge.
Answer: A
Correct answer: 1, 2 and 4
All three are standard reasons: private addressing behind a public one, renumbering avoided when changing ISP by translating at the boundary, and merging two intranets whose address ranges overlap. Statement 3 is not a NAT use - if no host is to reach the internet, the answer is not to route or to filter, not to translate.
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