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Question 58 - JN0-280 discussion

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Exhibit:

Referring to the exhibit, which behavior does this configuration enable on the ge-0/0/1.0 interface?

A.

This configuration enables a MAC address learned on the interface to be persistently retained in the Ethernet-switching table, even after a reboot.

Answers
A.

This configuration enables a MAC address learned on the interface to be persistently retained in the Ethernet-switching table, even after a reboot.

B.

This configuration enables the device to place a MAC address that persistently causes network errors into a special protected VLAN.

Answers
B.

This configuration enables the device to place a MAC address that persistently causes network errors into a special protected VLAN.

C.

This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic.

Answers
C.

This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic.

D.

This configuration enables the interface to learn and remember MAC addresses, until the device is rebooted.

Answers
D.

This configuration enables the interface to learn and remember MAC addresses, until the device is rebooted.

Suggested answer: A

Explanation:

The configuration in the exhibit shows the persistent-learning feature enabled on interface ge-0/0/1.0.

Step-by-Step Breakdown:

Persistent Learning:

Persistent-learning ensures that the MAC addresses learned on the interface are retained in the Ethernet-switching table, even after a device reboot. This prevents the need to re-learn MAC addresses after the device restarts, improving stability and reducing downtime.

Use Case:

This feature is particularly useful in environments where the re-learning of MAC addresses could cause temporary disruptions or delays in communication, such as in critical Layer 2 network segments.

Command Example:

set switch-options interface ge-0/0/1.0 persistent-learning

Juniper

Reference:

Persistent MAC Learning: In Junos, enabling persistent-learning ensures that learned MAC addresses are not lost during reboots, contributing to smoother network operations in environments where stability is crucial.

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asked 10/10/2024
Jose Alberto Vecino Pacheco
31 questions
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