Continue your lesson
Tie every forwarding decision to interface state, Layer 2 state, addressing, routing, and policy.
Block 1 of 1Compare MAC learning · Unknown-unicast flooding · MAC forwarding · MAC aging
Current · 11 min
Compare MAC learning · Unknown-unicast flooding · MAC forwarding · MAC aging
Concept notes
MAC learning
Records a frame's source MAC address against the incoming port.
Unknown-unicast flooding
Copies a frame when the destination MAC is not learned.
MAC forwarding
Sends a known unicast frame only through its learned destination port.
MAC aging
Removes an inactive dynamic forwarding entry after its timer expires.
Review the concept notes, then answer four related questions. That is enough for today; more practice is 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 1.13 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.