Cisco 100-105 Exam

What does the “Inside Global” address represent in the configuration of NAT?

  • A. the summarized address for all of the internal subnetted addresses
  • B. the MAC address of the router used by inside hosts to connect to the Internet
  • C. a globally unique, private IP address assigned to a host on the inside network
  • D. a registered address that represents an inside host to an outside network
Answer: Option D.

NAT: Local and Global Definitions
Cisco defines these terms as:
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 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 owner. The address is allocated from a globally routable address or network space. These 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 destination and ip nat outside source. 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.

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