How to memorize RFC3330 all prefix ?
You know in some cases you have no any tool to search for RFC specification(if someone know how to search RFC in Cisco Document Website, please leave your comment), but you still need to apply some network security policy, then you have to hard dump to your brain. For example, in SP CCIE Lab, the questions may ask you to apply an access-list to match all prefix documented in RFC 3330. After my hard work, I have find out some hints for this RFC related reserved prefix listing: Part I : RFC 1918 In RFC 3330 including well-known private IP network defined in RFC1918, so I think it is no a problem for most network engineer. - 10.0.0.0/8 - 172.16.0.0/12 - 192.168.0.0/16 Part II : All classful network the First and the Last network (1)The First & Last network in Class A network - 0.0.0.0/8 - 127.0.0.0/8 (2)The First & Last network in Class B network - 128.0.0.0/16 - 191.255.0.0/16 (3)The First & Last network in Class C network - 192.0.0.0/24 - 223.255.255.0/24 Part III : Class D