Which command would initiate a loopback on a Gigabit Ethernet interface ge-0/0/0?
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A. B. C. D.B
The correct command to initiate a loopback on a Gigabit Ethernet interface ge-0/0/0 in Junos OS is A. # set interfaces ge-0/0/0 unit 0 loopback.
Explanation: A loopback test is used to test the physical layer connectivity of a network interface. It creates a logical loopback interface, which sends any data received back to the same interface. This test can be performed on Junos OS using the following command:
This command sets the logical unit 0 of the Gigabit Ethernet interface ge-0/0/0 to loopback mode. The loopback mode can be verified using the following command:
show interfaces ge-0/0/0
The output of this command will show that the interface is in loopback mode.
Option B is incorrect because there is no such command in Junos OS as "# set interfaces ge-0/0/0 gigether-options loopback".
Option C is incorrect because the correct syntax in Junos OS to configure an interface is "set interfaces [interface-name] [unit] [family] [address]", and the "loopback" parameter should be specified in the "unit" section.
Option D is incorrect because there is no such command in Junos OS as "> loopback ge-0/0/0".