Learn how to resolve the issue of host traffic being dropped when connected to a different interface on an EX Series switch with persistent MAC learning enabled. Discover the correct command to solve the problem and excel in your Juniper JN0-351 certification exam.
Table of Contents
Question
A host is connected to your EX Series switch using an interface with persistent MAC learning enabled. When you connect the host to another interface on the same switch, all traffic generated by the host is dropped.
Which action should you perform to solve the problem?
A. Configure the interface as a trunk port.
B. Enter the clear dhcp snooping database command.
C. Enter the clear ethernet switching table persistent learning command.
D. Disable dynamic ARP inspection.
Answer
C. Enter the clear ethernet switching table persistent learning command.
Explanation
When a host is connected to an EX Series switch using an interface with persistent MAC learning enabled, and then moved to another interface on the same switch, the switch will continue to associate the host’s MAC address with the original interface. As a result, traffic generated by the host on the new interface will be dropped because the switch is sending the traffic to the wrong interface based on its persistent MAC learning table.
To resolve this issue, you should enter the command:
clear ethernet switching table persistent learning
This command clears the persistent MAC learning table on the switch, allowing it to relearn the correct interface for the host’s MAC address. Once the table is cleared, the host’s traffic will be correctly forwarded through the new interface, solving the connectivity problem.
The other options are incorrect because:
A. Configuring the interface as a trunk port does not address the persistent MAC learning issue.
B. The clear dhcp snooping database command is unrelated to the problem at hand.
D. Disabling dynamic ARP inspection does not resolve the persistent MAC learning problem.
Therefore, the correct answer is C: Enter the clear ethernet switching table persistent learning command.
Juniper JN0-351 certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the Juniper JN0-351 exam and earn Juniper JN0-351 certification.