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.
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)- A14% (7)
- B4% (2)
- C71% (35)
- D10% (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.
`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.
`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.
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.
`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
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