Confused on configuring protocols / network numbers

mobri09mobri09 Users Awaiting Email Confirmation Posts: 723
in CCNA & CCENT
Things are not clicking in this area for me.

Router A Networks
192.168.10.0
192.168.20.0

Router B Network
192.168.40.0
192.168.30.0

Router C network
192.168.50.0

When i configure RIP,IGRP, or EIGRP I am using the full network number when i apply my protocols..for example router RIP 192.168.10.0 my routes show up in the routing table with other found routes. BUT when i configure my protocols with the network number 192.168.0.0 NO routes show up in the routing tables. In cisco press and sybex both books state you should be able to put the network number in ex 192.168.0.0 and it will apply to all interfaces.... Very confused on applying this stuff on the ROUTER ex classless and classful. I know the theory but its not clicking. Any help would be great
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  • dtlokeedtlokee Member Posts: 2,378 ■■■■□□□□□□
    192.168.x.x is a class C address, so 192.168.0.0/24 has a network number of 192.168.0.0 whereas the 192.168.10.0 network would be 192.168.10.0. If you entered 192.168.0.0 it would not match the 192.168.10.0 network. If we were using a class B address (say 172.16.1.0/24 and 172.16.10.0/24) then you could enter 172.16.0.0 and it would apply to both subnets.
    The only easy day was yesterday!
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  • mobri09mobri09 Users Awaiting Email Confirmation Posts: 723
    Not to be rude...but i do not follow your example at the end...it seems like the same as mine.
    The bottom of page 253 in sybex in the same ordeal
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  • dtlokeedtlokee Member Posts: 2,378 ■■■■□□□□□□
    the difference is a 172.16.x.x address is a class B which means the first 2 octets represent the network number, where a 192.168.x.x is a class C where the first 3 octets represent the network number. So when you are using a 192.168.0.0 address in your network statement it will only apply to interfaces with a 192.168.0.x address, not ones with a 192.168.10.x address.

    On a side note the term "network" refers to an address using the default mask, where a "subnet" is an address using a mask longer (more 1's in the subnet mask). When we talk about the "network" address technically that refers to the classful network, ie what is the neork address for 128.44.15.1? Answer 128.44.0.0 because it is a class B address
    The only easy day was yesterday!
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  • mobri09mobri09 Users Awaiting Email Confirmation Posts: 723
    I have been studying like crazy and overlooked that 192.168.0.0 problem. Huge brain fart on my part. I really appreciate your second posting and your time as well. Things are clear now :)
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  • dtlokeedtlokee Member Posts: 2,378 ■■■■□□□□□□
    No problem, good luck
    The only easy day was yesterday!
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