Continue your lesson
Tie every forwarding decision to interface state, Layer 2 state, addressing, routing, and policy.
Block 1 of 2Compare Route source code · Route prefix · Next hop
Current · 7 min
Compare Route source code · Route prefix · Next hop
Optional concept notes
Route source code
Shows how a routing table entry was learned.
Route prefix
Identifies the destination network and its mask length.
Next hop
Identifies the router used to reach a remote destination.
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 2Understand Administrative distance
7 min
Understand Administrative distance
Optional concept notes
Administrative distance
Ranks trust between routes learned from different sources.
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 3.1 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.