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352-001 · Question #86
352-001 Question #86: Real Exam Question with Answer & Explanation
The correct answer is B: proposal-agreement handshake. IEEE 802.1w (RSTP) achieves rapid convergence through the proposal-agreement handshake, which allows adjacent switches to negotiate port state transitions without waiting for legacy STP timers.
Question
If a network design must support rapid convergence on half-duplex interfaces, which IEEE 802.1w capability should be used?
Options
- Aroot guard
- Bproposal-agreement handshake
- Cloop guard
- DUplinkFast
Explanation
IEEE 802.1w (RSTP) achieves rapid convergence through the proposal-agreement handshake, which allows adjacent switches to negotiate port state transitions without waiting for legacy STP timers.
Common mistakes.
- A. Root guard is a protective feature that rejects superior BPDUs on specific ports to enforce root bridge placement and does not accelerate convergence.
- C. Loop guard prevents ports from transitioning to Forwarding when BPDUs are lost, serving as a protection mechanism rather than a convergence accelerator.
- D. UplinkFast is a Cisco-proprietary extension to legacy 802.1D STP, not a feature of the IEEE 802.1w standard.
Concept tested. RSTP proposal-agreement rapid convergence mechanism
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html
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