H12-821_V1.0 · Question #836
The Discard port in RSTP can replace the failed root port.
The correct answer is B. FALSE. B is correct because in RSTP, it is the Alternate Port - not the "Discard port" - that replaces a failed root port. The Alternate Port holds a pre-calculated backup path to the root bridge and transitions to the root port role almost immediately upon failure, enabling RSTP's…
Question
Options
- ATRUE
- BFALSE
How the community answered
(24 responses)- A25% (6)
- B75% (18)
Explanation
B is correct because in RSTP, it is the Alternate Port - not the "Discard port" - that replaces a failed root port. The Alternate Port holds a pre-calculated backup path to the root bridge and transitions to the root port role almost immediately upon failure, enabling RSTP's fast convergence.
Why A is wrong: "Discard" (Discarding) is a port state, not a port role. Confusing states and roles is a classic trap. While the Alternate Port happens to be in the Discarding state, it is the role (Alternate) that defines its ability to take over - not the state itself. No port is called a "Discard port" in RSTP terminology.
Memory tip: Think "A for Alternate, A for Alternative Root" - the Alternate Port is your alternative path to the root bridge, ready to instantly promote itself if the root port goes down.
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