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Exam JN0-348 topic 1 question 83 discussion

Actual exam question from Juniper's JN0-348
Question #: 83
Topic #: 1
[All JN0-348 Questions]

Which statement about configuring persistent MAC learning is correct?

  • A. Persistent MAC learning requires 802.1X authentication.
  • B. Persistent MAC learning can be configured on access mode interfaces.
  • C. Persistent MAC learning flushes dynamically learned MAC addresses on reboots.
  • D. Persistent MAC learning cannot be configured on redundant trunk groups.
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Suggested Answer: B 🗳️

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Fellowes1689
Highly Voted 5 years ago
The answer should B & D. The interface has to be in access mode AND you cannot enable persistent MAC learning on an interface that is part of a redundant trunk group.
upvoted 5 times
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Anarky19
Most Recent 4 years, 6 months ago
B is correct: "Interfaces must be configured in access mode (use the port-mode configuration statement or, for switches operating on the Enhanced Layer 2 Software (ELS) configuration style, the interface-mode configuration statement)." We already agree that can't configure it in an interface that belongs to a redundant trunk group.. But, Could you configure persistent mac limiting in the redundant trunk group, ie rtg0? I don't find any information about it.
upvoted 3 times
Clxxcv420
4 years, 1 month ago
Can not be used if port: 802.1X - participant. part of RTG group. "no-mac-learning" on interface.
upvoted 1 times
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rodobrian
4 years, 9 months ago
Fellowes is Correct. From the link: You cannot enable persistent MAC learning on an interface that is part of a redundant trunk group. https://www.juniper.net/documentation/en_US/junos/topics/topic-map/understanding_and_using_persistent_mac_learning.html
upvoted 2 times
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boyseven777
4 years, 10 months ago
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/understanding_and_using_persistent_mac_learning.html
upvoted 1 times
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