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What does the following access list, which is applied on the external interface FastEthernet 1/0 of the perimeter router, accomplish? router(config)#access-list 101 deny ip 10.0.0.0 0.255.255.255 any log router (config)#access-list 101 deny ip 192.168.0.0 0.0.255.255 any log router (config)#access-list 101 deny ip 172.16.0.0 0.15.255.255 any log router (config)#access-list 101 permit ip any any router (config)#interface fastEthernet 1/0 router (config-if)#ip access-group 101 in
Correct Answer: C
Explanation/Reference: Explanation: The private IP address ranges defined in RFC 1918 are as follows: 10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255.255 These IP addresses should never be allowed from external networks into a corporate network as they would only be able to reach the network from the outside via routing problems or if the IP addresses were spoofed. This ACL is used to prevent all packets with a spoofed reserved private source IP address to enter the network. The log keyword also enables logging of this intrusion attempt.