Cisco CCNP / BSCI Exam Tutorial: 10 ISIS Details You Must Know!
Earning your CCNP certification and passing the BSCI exam depends on knowing the details of many Cisco technologies, ISIS chief among them. To help you prepare for exam success, here’s a list of ISIS terminology and basic concepts that will help you pass this tough exam. Enjoy!
ISIS Terms:
Domain: section of the network under common administrative control
Area: logical segment of the network composed of contiguous routers and their data links
Intermediate System: A router.
End System: A host device.
The four levels of ISIS routing:
Level 0: ES-IS routing in the same subnet.
Level 1: IS-IS routing in the same area.
Level 2: IS-IS routing in the same domain.
Level 3: Inter-domain routing performed by InterDomain Routing Protocol (IDRP).
ISIS Adjacency Possibilities:
L1: Can form adjacency with any L1 in the same area and any L1/L2 in the same area.
L2: Can form adjacency with any L2 in any area, and with an L1/L2 in any area.
L1/L2: Can form adjacency with any L1 in the same area, L1/L2 in any area, and L2...
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