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Exam JN0-351 topic 1 question 85 discussion

Actual exam question from Juniper's JN0-351
Question #: 85
Topic #: 1
[All JN0-351 Questions]

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.
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Suggested Answer: C 🗳️
by samurraj at Oct. 3, 2024, 12:05 p.m.

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samurraj
1 month, 3 weeks ago
Selected Answer: C
When persistent MAC learning is enabled, the switch retains the MAC address of the host on the original interface. If the host is connected to a different interface, the switch still expects the traffic to come from the original interface, causing dropped packets. Clearing the persistent learning table will allow the switch to relearn the host's MAC address on the new interface.
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