What are two benefits of using NAT? (Choose two.)

Question:
What are two benefits of using NAT? (Choose two.)

• A. NAT protects network security because private networks are not advertised.
• B. NAT accelerates the routing process because no modifications are made on the packets.
• C. Dynamic NAT facilitates connections from the outside of the network.
• D. NAT facilitates end-to-end communication when IPsec is enable.
• E. NAT eliminates the need to re-address all host that require external access.
• F. NAT conserves addresses through host MAC-level multiplexing.

Explanation: By not reveal the internal IP addresses, NAT adds some security to the inside network -> A is correct.
NAT has to modify the source IP addresses in the packets -> B is not correct.

Connection from the outside to a network through “NAT” is more difficult than a normal network because IP addresses of inside hosts are hidden -> C is not correct.

In order for IPsec to work with NAT we need to allow additional protocols, including Internet Key Exchange (IKE), Encapsulating Security Payload (ESP) and Authentication Header (AH) -> more complex -> D is not correct.

By allocating specific public IP addresses to inside hosts, NAT eliminates the need to re-address the inside hosts -> E is correct.

NAT does conserve addresses but not through host MAC-level multiplexing. It conserves addresses by allowing many private IP addresses to use the same public IP address to go to the Internet -> F is not correct.

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