Which three commands will cause a logical interface to go administratively down after being committed? (Choose three.)
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A. B. C. D. E.BCE
The Junos OS provides several commands to configure and manage logical interfaces, and each command has different effects on the state of the interface.
The question is asking which commands will cause a logical interface to go administratively down after being committed. Here are the explanations of the three correct commands:
A. shutdown: This command immediately brings down the interface and disables it, preventing any traffic from passing through it. The interface remains down until the shutdown command is removed, or the device is restarted. This command can be used to perform maintenance, change hardware, or troubleshoot the interface.
B. deactivate: This command removes a configuration statement from the interface without disabling it. When a configuration statement is deactivated, it does not take effect until the configuration is committed. This command can be used to remove a configuration without affecting the interface's operation.
C. disable: This command disables an interface and stops any traffic from passing through it. Unlike the shutdown command, the disable command does not immediately bring down the interface. Instead, it marks the interface as "administratively down." The interface remains in this state until the disable command is removed, or the device is restarted. This command can be used to prevent a faulty interface from participating in network traffic.
Therefore, the correct answers are A, B, and C. The 'down' command is not valid in Junos OS and will result in an error message. The 'delete' command removes the interface configuration altogether, but it does not affect the interface's operation.