Which statement about the inside interface configuration in a NAT deployment is true?

Question:
Which statement about the inside interface configuration in a NAT deployment is true?

• It is defined globally
• It identifies the location of source addresses for outgoing packets to be translated using access or route maps.
• It must be configured if static NAT is used
• It identifies the public IP address that traffic will use to reach the internet.

Explanation: When we specify a NAT “inside” interface (via the “ip nat inside” command under interface mode), we are specifying the source IP addresses. Later in the “ip nat” command under global configuration mode, we will specify the access or route map for these source addresses.
For example the command:

Router(config)# ip nat inside source list 1 pool PoolforNAT

after the keyword “source” we need to specify one of the three keywords:

+ list: specify access list describing local addresses (but this command does not require an “inside” interface to be configured)
+ route-map: specify route-map
+ static: specify static local -> global mapping

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