Remember IS-IS
Full name: Intermediate System to Intermediate System
Memory aid: Intermediate Systems share their map with other Intermediate Systems.
IS-IS uses different protocol machinery from OSPF despite both being link-state IGPs.
Study area: Protocols & logical ports · Batch 7
Relevant study for: CompTIA Network+ N10-009 · Cisco CCNA 200-301 · CompTIA A+ Core 1 220-1201 · CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline
Practice with exam flashcards →Networking & Connectivity / Knowledge library
IS-IS — Intermediate System to Intermediate System
Exchanges link-state routing information between participating routers.
Why learn IS-IS — Intermediate System to Intermediate System?
Exchanges link-state routing information between participating routers.
Where it came from
IS-IS uses different protocol machinery from OSPF despite both being link-state IGPs.
- Memory aid (a learning cue, not the expansion): Intermediate Systems share their map with other Intermediate Systems.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand IS-IS: Intermediate System to Intermediate System.
- Recall this memory aid: Intermediate Systems share their map with other Intermediate Systems.
- Explain the practical use: Exchanges link-state routing information between participating routers.
- Explain this distinction: IS-IS uses different protocol machinery from OSPF despite both being link-state IGPs.
- Identify IS-IS in a device specification, architecture diagram, or system inventory.
Documentation and sources
- IETF RFC 1195 (www.rfc-editor.org)