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BSCI Exam Cram™ 2 (Exam 642-801) by Ed Tittel, Michael J. Shannon

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Types of IS-IS Routers and Their Role in Area Hierarchical Design

According to RFC 1195, pure IP domains are systems that use only IP as their primary routing protocol. Although IP domains route only IP traffic, they can also support the processing and forwarding of OSI packets necessary for IS-IS functionality. A pure ISO domain can transport only ISO traffic, which includes the traffic necessary to operate IS-IS. A dual domain, on the other hand, routes both IP and OSI CLNP traffic at the same time.

Integrated IS-IS is similar to many of the other routing protocols discussed in this BCSI course. Integrated IS-IS supports VLSM. Both the subnet mask and prefix are exchanged in routing updates. You can also redistribute routes in and out of IS-IS. ...

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