Continue your lesson
Tie every forwarding decision to interface state, Layer 2 state, addressing, routing, and policy.
Block 1 of 2Compare CDP · Platform identifier
Current · 15 min
Compare CDP · Platform identifier
Optional concept notes
CDP
Advertises Cisco device identity platform and port information to neighbors.
Platform identifier
Names a neighbor's hardware model in discovery output.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Block 2 of 2Compare LLDP · Port identifier
11 min
Compare LLDP · Port identifier
Optional concept notes
LLDP
Advertises vendor-neutral device and port information to Layer 2 neighbors.
Port identifier
Names the neighbor interface attached to the local link.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Write or inspect a small Cisco configuration, name the expected show-command evidence, and explain how a frame or packet crosses it.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 2.3 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.