An internal web server is to be deployed on a local area network. It is required that the IP address assigned to the server is unregistered (RFC 1918) and still be reachable through the Internet. When that IP address is mapped to a routable IP address, it should remain the same unless administratively deleted or changed. Which of the following commands should satisfy the requirements?

Router(config)# interface f0/0 Router(config-if)# ip nat outside Router(config-if)# ip nat inside

Router(config)# interface f0/0 Router(config-if)# ip nat inside Router(config)# interface s2/0 Router(config-if)# ip nat outside

Router(config)# interface f0/0 Router(config-if)# ip nat inside Router(config)# interface s2/0 Router(config-if)# ip nat outside Router(config)# ip nat inside source static 10.1.1.254 203.125.32.1

Router(config)# interface f0/0 Router(config-if)# ip nat inside Router(config)# interface s2/0 Router(config-if)# ip nat outside Router(config)# access-list 1 permit 10.1.1.0 0.0.0.255 Router(config)# ip nat pool skillset_pool 203.125.32.1 203.125.32.6 netmask 255.255.255.248 Router(config)# ip nat inside source list 1 pool skillset_pool

Explanation

The question requires the use of unregistered IP address (RFC 1918) or private IP address and still be routable to the internet, also, the IP addresses mapping should remain the same unless changed or deleted manually. This requires the use of static NAT. To configure static NAT, use the interface command "ip nat inside" (for the LAN part), ip nat outside" (for the WAN part), and finally create a static NAT statement to map the private IP address to a routable IP address: "ip nat inside source static 10.1.1.254 203.125.32.1". (http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/4606-8.html)