Continue your lesson
Tie every forwarding decision to interface state, Layer 2 state, addressing, routing, and policy.
Block 1 of 1Compare SDN overlay · SDN underlay · Network fabric · Northbound interface
Current · 10 min
Compare SDN overlay · SDN underlay · Network fabric · Northbound interface
Optional concept notes
SDN overlay
Provides logical connectivity built across an underlying transport network.
SDN underlay
Provides physical IP reachability that carries overlay traffic.
Network fabric
Combines controlled underlay and overlay functions into one architecture.
Northbound interface
Lets applications request services or policy from a controller.
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 6.3 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.