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quick is-is question

steve-o87steve-o87 Member Posts: 274
in CCNP
Does IS-IS operate at layer 2 of the OSI model? Being a routing protocol I figured Layer 3. Does it have something to do with CLNS?

Thanx
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    MrDMrD Member Posts: 441
    CLNP is a network layer protocol. CLNP offers the interface between the CLNS and the upper layers. CLNS provides network layer services to the transport layer through CLNP.
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