Which Network Address Translation (NAT) is the MOST convenient and secure solution?

A.
Hiding Network Address Translation

B.
Port Address Translation

C.
Dedicated Address Translation

D.
Static Address Translation

Explanation:
Port Address Translation (PAT) maps one internal IP address to an external IP address and port number
combination. Thus, PAT can theoretically support 65,536 (2 16 ) simultaneous communications from internal
clients over a single external leased IP address. A company can save a lot of money by using PAT, because
the company needs to buy only a few public IP addresses, which are used by all systems in the network.
Incorrect Answers:
A: NAT maps one internal IP address to one external IP address. Compared to PAT this is pretty bad.
C: There is no NAT implementation called Dedicated Address Translation.
D: Static Address Translation is not convenient as it must be configured manually.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 606