Exam 200-125 topic 1 question 46 discussion

Actual exam question from Cisco's 200-125

Question #: 46
Topic #: 1

Refer to the exhibit.

Each of these four switches has been configured with a hostname, as well as being configured to run RSTP. No other configuration changes have been made.
Which three of these show the correct RSTP port roles for the indicated switches and interfaces? (Choose three.)

A. SwitchD. Gi0/2, root
B. SwitchA, Fa0/2, designated
C. SwitchB, Gi0/l, designated
D. SwitchA, Fa0/l, root
E. SwitchB, Gi0/2, root
F. SwitchC, Fa0/2, root ABD

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Suggested Answer: Explanation 🗳️

by XYZ at Sept. 1, 2019, 4:31 p.m.

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MrRobot316

Highly Voted 5 years, 9 months ago

Switch C is the Root Bridge since it has the lowest MAC address, Therefore Fa0/1 and Fa0/2 are Designated Ports Which makes Fa0/1 of Switch A and Gi0/2 of Switch D root ports For Switch B, shortest path is through Switch D due to STP cost, which means Gi0/1 of SwitchB is Root Port and Gi0/1 of Switch D Designated Port So Far Switch C: Fa0/1, Fa0/2 DP Switch D: Gi0/2: root ; Gi0/1 DP Switch B: Gi0/1 root Switch A: Fa0/1 root For the link between Switch A and B, A has the lowest MAC address Therefore Fa0/2 is DP and Gi0/2 of Switch B is Alternate Port Answers: ABD

upvoted 6 times

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M11156_

Most Recent 3 years, 2 months ago

Selected Answer: ABD

upvoted 1 times

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XYZ

5 years, 10 months ago

correct answers: A,B,D

upvoted 3 times

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