Knowledge Base for NAT SIM:

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.

Command: ip nat pool
To define a pool of IP addresses for Network Address Translation (NAT), use the ip nat pool command in global configuration mode. To remove one or more addresses from the pool, use the no form of this command.

Syntax:
ip nat pool name start-ip end-ip {netmask netmask prefix-length prefix-length}[type rotary]
no ip nat pool name start-ip end-ip {netmask netmask prefix-length prefix-length} [type rotary]

Usage Guidelines: ip nat pool

This command defines a pool of addresses using start address, end address, and either netmask or prefix length. The pool could define either an inside global pool, an outside local pool, or a rotary pool.

Command: ip nat inside source
To enable Network Address Translation (NAT) of the inside source address, use the ip nat inside source command in global configuration mode. To remove the static translation or remove the dynamic association to a pool, use the no form of this command.

Syntax:
ip nat inside source {list {access-list-number access-list-name} route-map name} {interface type number pool name} [mapping-id map-name vrf name] [overload]

Usage Guidelines: ip nat inside source
This command has two forms: dynamic and static address translation. The form with an access list establishes dynamic translation. Packets from addresses that match the standard access list are translated using global addresses allocated from the pool named with the ip nat pool command.

Packets that enter the router through the inside interface and packets sourced from the router are checked against the access list for possible NAT candidates. The access list is used to specify which traffic is to be translated.

Alternatively, the syntax form with the keyword static establishes a single static translation.

NAT SIM QUESTION