can anyone tell me the difference b/n classeless and classefull addresses?

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#1 if your going to ask that question take those Certifications out of your signature because if you really had those you would know this question,,

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I would think CCIE would be enough letters as it would include or supercede the others. Although, if you were playing Scrabble the other letters could come in handy!

For those of you that are not expected to know the answer, but want to:

Short answer: Classful protocols cannot carry a network mask as part of the
routing advertisement. This limits the routing protocol to only supporting a
single subnetting scheme within the autonomous system. Additionally, when
advertising network addresses between different major network spaces, the
routing protocol will summarize the routing information to the natural class
(A, B, C) of the network address. It must do this since there is no method for
one major class network to be updated with the network mask from another major
class network. The best the routing protocol can do is summarized based on
the class of the network (derived from the initial bits of the address) and the
natural network mask associated with the network class.

A classless protocol has the ability to carry network mask information as part
of the routing update. Since the network mask for each routing entry precisely
describes the network being advertised and the address range it covers, a
network address range can be subnetted using multiple network masks.
Additionally, it is possible to carry "subnet" information between network
address spaces that formerly would have crossed major network boundaries.
Essentially, removing the implied network mask based on network class allows
the routing protocol to both summarize and subnet an address space based on the
network masks associated with each routing table entry.

Jeff always says: "Get a good search engine."

Last edited by jeff_j_black on 07-08-02 at 03:23 PM

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I think he filled those designations in wrong colume, shoud be "working on".

It is by no mean a CCDA (CCNA may not know details of classful and classless ip address but just know the concept) does not know their differences, let alone CCIE.

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Rich is not supreme, but the poor wishes be supreme.

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http://www.cisco.com/univercd/cc/td.../ito_doc/ip.htm

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