Classful vs Classless

in CCNA & CCENT
Could someone explain this to me in their own words...?
I somewhat understand it. I know that RIP v1 and IGRP use classful routing, and RIPv2, EIGRP, OSPF use classless routing.
Am I right in saying that with classful routing, the whole network would come under a certain subnet mask, where as if using classless routing, some links in the network can have differnet subnet masks, and some links can use different subnet masks?
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I somewhat understand it. I know that RIP v1 and IGRP use classful routing, and RIPv2, EIGRP, OSPF use classless routing.
Am I right in saying that with classful routing, the whole network would come under a certain subnet mask, where as if using classless routing, some links in the network can have differnet subnet masks, and some links can use different subnet masks?
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Im a newbie.... please be easy on me.
0
Comments
Classful routing protocols do not send any subnet mask information in their routing updates. They assume that the mask that should be used is the full classful subnet mask (Class A - 255.0.0.0, Class C - 255.255.255.0, etc).
Classless routing protocols DO send subnet mask information within routing updates. They don't assume that just because you've got a Class B address that you're using the entire range.
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The only problem with this is that if you want to support subnets then you have to make sure that the entire network is contiguous across all routers and interfaces in that network range.
A classful protocol sends subnet information. This allows you to create discontiguous networks with any given classful network address.