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Anyone here ever taken a networking class?

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Raithed China7078 Posts September 25 2008 03:49 GMT #1 the class that you config and/or program cisco routers. i have a question for people who has taken the course. how does someone find out what class(class A, B, C and D) a subnet is? i found this on wiki; http://en.wikipedia.org/wiki/Classful_network#Classes for example "find the exact number of class B public addresses" but yeah, how does someone find that? class B is 128.0.0.0 ... do we only look at 128 and change this to hex or?

ilbh Brazil1606 Posts September 25 2008 04:16 GMT #2 they are divided into 4 x 8 bits, 4 octets 11111111.00000000.00000000.00000000 for example: class D could be any thing that finishes with 4 zeros from 0000000.00000000.00000000.00000000 to 11111111.11111111.11111111.11110000 where 00000000 = 0 and 11111111 = 255 if you convert from binary to decimal this is only an example, i dont remember what is the definition for the class D since the first and the last IP addresses cant be used to your LAN, so if you have a class with that range: 0000000.00000000.00000000.00000000 ~ to ~ 0000000.00000000.00000000.00000011 which is 0.0.0.0 to 0.0.0.3 so 0.0.0.0 and 0.0.0.3 cant be used to your LAN. you will be only able to use these addresses to your LAN: 0000000.00000000.00000000.00000001 0000000.00000000.00000000.00000010 only 2 adresses gotcha?

Raithed China7078 Posts September 25 2008 04:35 GMT #3 so i would always convert bin into decimal? would hex be of any use here? thanks a lot.

ilbh Brazil1606 Posts September 25 2008 04:41 GMT #4 no hex here only binary and decimal

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