Anyone here ever taken a networking class?

Raithed

China7078 Posts

September 25 2008 03:49 GMT

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

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

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

no hex here

only binary and decimal

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Anyone here ever taken a networking class?

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