JN0-102 · Question #299
user@router# run show interfaces terse Interface Admin Link Proto Local fe-0/0/0 up up fe-0/0/0.0 up upinet 10.0.39.2/24 iso mpls fe-0/0/1 up up fe-0/0/1.0 up upinet 10.0.18.2/24 fe-0/0/1.5 down up in
The correct answer is C. Issue the command delete interfaces fe-0/0/1.5 disable.. The show interfaces terse output indicates that the fe-0/0/1.5 logical interface is administratively down, despite its physical link being up, which requires removing the disable configuration.
Question
user@router# run show interfaces terse Interface Admin Link Proto Local fe-0/0/0 up up fe-0/0/0.0 up upinet 10.0.39.2/24 iso mpls fe-0/0/1 up up fe-0/0/1.0 up upinet 10.0.18.2/24 fe-0/0/1.5 down up inet 10.0.19.2/24 An administrator is unable to ping any address on the 10.0.19.0/24 subnet. To identify the problem, the administrator uses the command shown in the exhibit. Which step should be taken to solve the problem?
Options
- ACheck the physical cable.
- BIssue the command activate interfaces fe-0/0/1.5 .
- CIssue the command delete interfaces fe-0/0/1.5 disable.
- DReconfigure the IP address.
How the community answered
(27 responses)- A7% (2)
- B11% (3)
- C56% (15)
- D26% (7)
Why each option
The `show interfaces terse` output indicates that the `fe-0/0/1.5` logical interface is administratively down, despite its physical link being up, which requires removing the disable configuration.
Checking the physical cable is unnecessary because the `Link up` status confirms the physical layer is operational.
The command `activate interfaces fe-0/0/1.5` is not a valid Junos command for enabling an interface that is explicitly `disable`d.
The `Admin down` status for interface `fe-0/0/1.5` indicates it is administratively disabled. In Junos OS, the `disable` statement explicitly deactivates an interface, so to bring it up, the `delete interfaces fe-0/0/1.5 disable` command must be used to remove this configuration statement.
Reconfiguring the IP address is not the problem; the existing IP address `10.0.19.2/24` is valid, but the interface is administratively down.
Concept tested: Junos interface administrative state and configuration commands
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-basics/topics/topic-map/junos-basics-disabling-interface.html
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