Which three port states are used by RSTP 802.1w? (Choose three.)

The correct answer is B. Learning C. Forwarding E. Discarding. Classic STP (802.1D) uses five port states: Disabled, Blocking, Listening, Learning, and Forwarding. RSTP (802.1w) streamlined this to only three states to speed up convergence. 'Discarding' replaces and consolidates Disabled, Blocking, and Listening (none of these three states…

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Question

Exhibit

Options

AListening
BLearning
CForwarding
DBlocking
EDiscarding
FDisabled

How the community answered

(54 responses)

A
2% (1)
B
93% (50)
D
4% (2)
F
2% (1)

Explanation

Classic STP (802.1D) uses five port states: Disabled, Blocking, Listening, Learning, and Forwarding. RSTP (802.1w) streamlined this to only three states to speed up convergence. 'Discarding' replaces and consolidates Disabled, Blocking, and Listening (none of these three states forward data frames or learn MAC addresses). 'Learning' is retained - the port does not forward frames but does populate its MAC address table. 'Forwarding' is retained - the port both learns and forwards frames normally. The Listening state and Disabled state were eliminated as distinct states in RSTP.

Topics

#RSTP port states#IEEE 802.1w#discarding state#spanning tree

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