What does the “Inside Global” address represent in the configuration of NAT?
A.
the MAC address of the router used by inside hosts to connect to the Internet
B.
a globally unique, private IP address assigned to a host on the inside network
C.
the summarized address for all of the internal subnetted addresses
D.
a registered address that represents an inside host to an outside network
Explanation:
With NAT, Cisco defines 4 different types of addresses as follows:
* Inside local address – The IP address assigned to a host on the inside network. This is the
address configured as a parameter of the computer’s OS or received via dynamic address
allocation protocols such as DHCP. The address is likely not a legitimate IP address assigned by
the Network Information Center (NIC) or service provider.
* Inside global address – A legitimate IP address assigned by the NIC or service provider that
represents one or more inside local IP addresses to the outside world.
* Outside local address – The IP address of an outside host as it appears to the inside network.
Not necessarily a legitimate address, it is allocated from an address space routable on the inside.
* Outside global address – The IP address assigned to a host on the outside network by the
host’s owner. The address is allocated from a globally routable address or network space.
The above definitions still leave a lot to be interpreted. For this example, this document redefines
these terms by first defining “local address” and “global address.” Keep in mind that the terms
“inside” and “outside” are NAT definitions. Interfaces on a NAT router are defined as “inside” or“outside” with the NAT configuration commands, ip nat inside and ip nat outside . Networks to
which these interfaces connect can then be thought of as “inside” networks or “outside” networks,
respectively.
* Local address – A local address is any address that appears on the “inside” portion of the
network.
* Global address – A global address is any address that appears on the “outside” portion of the
network.