Cisco CCNP BSCI Exam Tutorial 10 ISIS Details You Must Know
Below is a MRR and PLR article in category Computers Technology -> subcategory Computer Certification.
Cisco CCNP / BSCI Exam Tutorial: 10 Essential ISIS Details
Introduction
To earn your CCNP certification and pass the BSCI exam, understanding key Cisco technologies, particularly ISIS, is crucial. Here’s a concise guide to 10 critical ISIS concepts that will help you succeed. Let's dive in!
Key ISIS Terminology
- Domain: A network segment under a single administrative control.
- Area: A logical segment consisting of connected routers and their data links.
- Intermediate System: Essentially, a router.
- End System: A host device.
ISIS Routing Levels
1. Level 0: ES-IS routing within the same subnet.
2. Level 1: IS-IS routing within the same area.
3. Level 2: IS-IS routing within the same domain.
4. Level 3: Inter-domain routing via the InterDomain Routing Protocol (IDRP).
ISIS Adjacency Options
- L1: Forms adjacency with any L1 in the same area and any L1/L2 in the same area.
- L2: Forms adjacency with any L2 in any area and with an L1/L2 in any area.
- L1/L2: Forms adjacency with any L1 in the same area, any L1/L2, and any L2 in any area.
Router Interface SNPA
The Subnetwork Point Of Attachment (SNPA) of a router interface is the highest DLCI number on a Frame network or the MAC address on an Ethernet segment.
ISIS Hello Types
- ESH: ES Hello, sent by End Systems to find a router.
- ISH: IS Hello, sent by Intermediate Systems to announce themselves. End Systems listen for these.
- IIH: IS-to-IS Hello, enables IS-IS adjacencies by being exchanged between Intermediate Systems.
Good luck with your CCNP exam preparation!
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