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Question 30 - JN0-351 discussion

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Exhibit.

You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.

In this scenario, which action would solve the delay in RSTP convergence?

A.
The hello-time must be increased.
Answers
A.
The hello-time must be increased.
B.
The force-version must be removed.
Answers
B.
The force-version must be removed.
C.
The bridge priority for EX-4 must be set at 4000.
Answers
C.
The bridge priority for EX-4 must be set at 4000.
D.
The max-age must be increased to 20
Answers
D.
The max-age must be increased to 20
Suggested answer: B

Explanation:

The exhibit shows the configuration of RSTP on EX-4, which has the commandforce-version stp.This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP1.This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence2.

The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches3. Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance.The switch will also generate a warning message that says ''Warning: STP version mismatch with neighbor'' when it receives a BPDU from a RSTP neighbor1.

To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology.To remove the command, you can use thedelete protocols rstp force-versioncommand in configuration mode1.

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asked 18/09/2024
Yogen Trikannad
34 questions
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