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JN0-102 · Question #417

You suspect a duplicate MAC address on a subnet. You want to display the MAC, errors, and statistics of the ge-0/0/0 interface. Which command will accomplish this task?

The correct answer is C. show interface ge-0/0/0 extensive. To diagnose a duplicate MAC address issue and view detailed interface information, the show interface ge-0/0/0 extensive command provides comprehensive details including MAC address, error counters, and statistics for the specified interface.

Operational Monitoring and Maintenance

Question

You suspect a duplicate MAC address on a subnet. You want to display the MAC, errors, and statistics of the ge-0/0/0 interface. Which command will accomplish this task?

Options

  • Ashow arp
  • Bshow Ethernet-switching table
  • Cshow interface ge-0/0/0 extensive
  • Dshow interface terse

How the community answered

(49 responses)
  • A
    14% (7)
  • B
    4% (2)
  • C
    71% (35)
  • D
    10% (5)

Why each option

To diagnose a duplicate MAC address issue and view detailed interface information, the `show interface ge-0/0/0 extensive` command provides comprehensive details including MAC address, error counters, and statistics for the specified interface.

Ashow arp

`show arp` displays the ARP cache, which maps IP addresses to MAC addresses, but it does not show interface-specific MAC addresses, errors, or statistics directly.

Bshow Ethernet-switching table

`show ethernet-switching table` displays the MAC address table used for Layer 2 forwarding, but it doesn't show interface-specific errors or statistics, nor does it directly help identify a duplicate MAC address on an interface in terms of its own address.

Cshow interface ge-0/0/0 extensiveCorrect

The `show interface ge-0/0/0 extensive` command provides highly detailed operational information for a specific interface, including its MAC address, input/output error statistics, traffic statistics, and other extensive parameters necessary for in-depth troubleshooting such as identifying unusual MAC activity.

Dshow interface terse

`show interface terse` provides a concise summary of interfaces, including their state and basic traffic counters, but it lacks the detailed MAC address information, error counters, and extensive statistics needed for diagnosing a duplicate MAC issue.

Concept tested: Junos interface troubleshooting commands

Source: https://www.juniper.net/documentation/us/en/software/junos/junos-cli/topics/ref/command/show-interfaces.html

Topics

#troubleshooting#interface monitoring#MAC address#show commands#extensive detail

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