Why This Cheat Sheet Matters for SPCOR
This cheat sheet covers the most important MPLS & Label Switching concepts tested on the SPCOR (SPCOR) certification exam. It contains 1 sections with 6 key points that you should memorize before exam day. Use this as a quick-reference guide during your final review sessions.
1Sections
6Key Points
MPLS Basics
- MPLS inserts a 32-bit label between L2 and L3 headers.
- Label fields: Label (20 bits), EXP/TC (3 bits for QoS), S (Bottom-of-Stack), TTL (8 bits).
- LDP (Label Distribution Protocol) distributes labels; uses TCP 646.
- PHP (Penultimate Hop Popping): second-to-last router removes label.
- LSP (Label Switched Path): unidirectional path through MPLS network.
- Segment Routing: encodes path in packet header, no LDP needed.
Practice MPLS & Label Switching Questions
Put your knowledge to the test with practice questions.
Cisco Command Quick Reference
Cisco IOS commands follow a hierarchical structure: User EXEC mode (>), Privileged EXEC mode (#), Global Configuration mode (config)#, and Interface Configuration mode (config-if)#. Master the transitions between these modes and the key "show" commands for each technology area — they are heavily tested on every Cisco exam.