Exam 300-420 topic 1 question 60 discussion

Actual exam question from Cisco's 300-420

Question #: 60
Topic #: 1

An architect is designing a network that will utilize the spanning tree protocol to ensure a loop-free topology. The network will support an engineering environment where it is necessary for end-users to connect their own network switches for testing purposes. Which feature should the architect include in the design to ensure the spanning-tree topology is not affected by these rogue switches?

A. BPDU Skew Detection
B. BPDU guard
C. loop guard
D. root guard

Show Suggested Answer

Suggested Answer: D 🗳️

by cwoolie at April 20, 2022, 7:25 p.m.

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certstudent2016

Highly Voted 1 year, 8 months ago

Selected Answer: D

https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10588-74.html As I mentioned earlier dont trust posts from cwoolie

upvoted 7 times

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wolfone

Most Recent 4 months ago

Selected Answer: D

The better solution, in my opinion, would be "bpdu filter", but it's not in the list!

upvoted 1 times

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DOSKIM

9 months, 1 week ago

D is the way to go with

upvoted 1 times

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Mohali98

1 year, 1 month ago

Selected Answer: D

D is the right answer ... root guard is the required feature

upvoted 2 times

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Hope66

1 year, 8 months ago

Rogue switch could become the new root switch. This can influence the spanning-tree topology I think that the answer is D (root guard)

upvoted 2 times

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cwoolie

1 year, 8 months ago

This should be loop guard not root guard.

upvoted 1 times

zlimvos

1 year, 6 months ago

No. bpgu guard: don't allow any switch to connect on your STP. root guard: allow switch to connect but with lower priority.

upvoted 1 times

johnu329

1 year, 2 months ago

If you were to use bpdu guard, it would no longer be possible "for end-users to connect their own network switches for testing purposes". Their switches may send BPDU's and therefore the port would not become operation. So, in this case you would choose: root guard That way, they will be able to connect their switches, yet no topology change will occur.

upvoted 3 times

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