Refer to the exhibit. At the end of an RSTP election process, which access layer switch port will assume the discarding role?

The correct answer is C. Switch4, port fa0/11. In RSTP, after the root bridge is elected, each non-root switch determines its root port (best path to root) and designated ports. Any remaining port that is not the root port or a designated port enters the discarding role. Switch4's fa0/11 connects to a segment where another sw

Operate a Medium-Sized Switched Network

Question

Refer to the exhibit.
At the end of an RSTP election process, which access layer switch port will assume the discarding role?

Exhibit

Options

ASwitch3, port fa0/1
BSwitch3, port fa0/12
CSwitch4, port fa0/11
DSwitch4, port fa0/2
ESwitch3, port Gi0/1
FSwitch3, port Gi0/2

How the community answered

(63 responses)

A
2% (1)
B
16% (10)
C
70% (44)
D
3% (2)
E
2% (1)
F
8% (5)

Explanation

In RSTP, after the root bridge is elected, each non-root switch determines its root port (best path to root) and designated ports. Any remaining port that is not the root port or a designated port enters the discarding role. Switch4's fa0/11 connects to a segment where another switch (Switch3) has a better or equal path to root via a different port, meaning Switch4's fa0/11 loses the designated port election on that segment. Since it is neither the root port nor the designated port for that segment, it assumes the discarding role. The discarding role in RSTP is equivalent to the blocking state in classic 802.1D STP.

Topics

#RSTP#port roles#discarding#STP election

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