H12-821_V1.0 · Question #835
Whether the non-edge port migrates to the Forvardin state is one of the criteria for RSTP to detect topology changes.
The correct answer is A. TRUE. Option A is correct because RSTP (IEEE 802.1w) explicitly defines a Topology Change (TC) event as occurring when a non-edge port transitions to the Forwarding state. Edge ports are deliberately excluded from this trigger because they connect to end devices (like PCs) and their…
Question
Options
- ATRUE
- BFALSE
How the community answered
(29 responses)- A83% (24)
- B17% (5)
Explanation
Option A is correct because RSTP (IEEE 802.1w) explicitly defines a Topology Change (TC) event as occurring when a non-edge port transitions to the Forwarding state. Edge ports are deliberately excluded from this trigger because they connect to end devices (like PCs) and their state changes don't affect Layer 2 path decisions between switches.
Option B is incorrect because RSTP's TC detection criteria is well-defined and documented - this is not an edge case or ambiguity. RSTP also triggers a TC when a non-edge port in Forwarding or Learning state goes down, but the forward-migration criterion is equally valid.
Memory tip: Think of it as "edge = endpoint, non-edge = network." Only non-edge ports (those connecting switches) change the actual forwarding topology, so only they matter for TC detection. If an edge port flapped, no switch paths change - no TC needed.
Topics
Community Discussion
No community discussion yet for this question.