Which configuration would be appropriate for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet?

Question:
Which configuration would be appropriate for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet?

• access-list 1 permit 10.0.0.0 0.255.255.255
  ip nat inside source list 1 interface serial 0/0/0 overload
• access-list 1 permit 10.0.0.0 0.255.255.255
  ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240
  ip nat inside source list 1 pool comp
• access-list 1 permit 10.0.0.0 0.255.255.255
  ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240
  ip nat inside source list 1 pool comp overload
• access-list 1 permit 10.0.0.0 0.255.255.255
  ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240
  ip nat inside source list 1 pool comp overload
  ip nat inside source static 10.0.0.5 209.165.200.225

Explanation: With the command, ip nat inside source list 1 interface serial 0/0/0 overload, the router is configured to translate internal private IP addresses in the range of 10.0.0.0/8 to a single public IP address, 209.165.200.225/30. The other options will not work, because the IP addresses defined in the pool, 192.168.2.0/28, are not routable on the Internet.

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