JN0-351: Enterprise Routing and Switching, Specialist (JNCIS-ENT)Demo

By Juniper · Question Mode

QuestionQ92

Layer 2 Switching/VLANs

Persistent MAC learning is enabled on a Juniper switch.

Which statement is correct?

  • A You can only enable persistent MAC learning on an interface on which 802.1x authentication is configured.
  • B You can enable persistent MAC learning on an interface where MAC learning is disabled.
  • C You can enable persistent MAC learning on an interface that is part of a redundant trunk group.
  • D You can only enable persistent MAC learning on an interface in access mode.
Explanation

For the legacy Junos behavior tested here, persistent MAC learning is supported only on an access-mode interface. It cannot be enabled on an interface configured for 802.1X authentication, with MAC learning disabled, or as part of a redundant trunk group. Beginning with Junos OS 22.4R1, Juniper also supports persistent MAC learning on trunk (VLAN-tagged) interfaces, so this limitation is release-dependent.

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