300-320 · Question #308
Which technology provides a layer 2 loop free and does not contain a port state named "Blocking"?
The correct answer is A. RPVST+. Rapid Per-VLAN Spanning Tree Plus (RPVST+) is Cisco's implementation of 802.1w (Rapid STP) on a per-VLAN basis. It replaces the traditional 802.1D port states - specifically eliminating the 'Blocking', 'Listening', and 'Disabled' states - and consolidates them into a single…
Question
Which technology provides a layer 2 loop free and does not contain a port state named "Blocking"?
Options
- ARPVST+
- BPVST+
- CMST
- DCST
How the community answered
(33 responses)- A94% (31)
- B3% (1)
- D3% (1)
Explanation
Rapid Per-VLAN Spanning Tree Plus (RPVST+) is Cisco's implementation of 802.1w (Rapid STP) on a per-VLAN basis. It replaces the traditional 802.1D port states - specifically eliminating the 'Blocking', 'Listening', and 'Disabled' states - and consolidates them into a single 'Discarding' state. This results in significantly faster convergence. PVST+ (Option B) and CST (Option D) are based on classic 802.1D and retain the 'Blocking' state. MST (Option C, based on 802.1s) also uses the 802.1w state machine and does not have a 'Blocking' state, but between the available choices, RPVST+ is the most direct and intended answer for this question.
Topics
Community Discussion
No community discussion yet for this question.