Discussion
Which of the following are disadvantages of using NAT?
1.Translation introduces switching path delays.
2.Conserves legally registered addresses.
3.Causes loss of end-to-end IP traceability.
4.Increases flexibility when connecting to the Internet.
5.Certain applications will not function with NAT enabled.
6.Reduces address overlap occurrence.
Answer: A
Correct answer: 1, 3 and 5
The genuine disadvantages are the switching delay translation adds, the loss of end-to-end traceability since the original source is hidden, and the applications that break because they carry addresses inside the payload - older FTP, SIP and IPSec among them. Statements 2, 4 and 6 are advantages of NAT rather than drawbacks, and are there to be sorted out.
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