At a rural fiber cooperative's regional POP, a technician reviewing the aggregation router's interface list sees the name ge-0/0/2. In the Junos physical interface naming convention, what does the "0/0/2" portion identify?
Select an answer to reveal the explanation.
Short Explanation
Think of the interface name as a mailing address: media type tells you the building, and "0/0/2" is floor/room/door — FPC slot, then PIC slot, then port. Once you can read that left to right, any Junos interface name on a rack of gear stops being a mystery string.
Full Explanation
Junos names a physical interface as media-type-fpc/pic/port, so ge-0/0/2 is a Gigabit Ethernet port where 0 is the FPC (Flexible PIC Concentrator) slot, the next 0 is the PIC slot within that FPC, and 2 is the port number on that PIC. That triplet always refers to hardware, never to a logical construct. The logical-unit answer confuses this with the number that comes after a dot (ge-0/0/2.0), which is a separate, software-only layer appended to the physical name, not embedded inside it. The routing-instance answer conflates a completely different hierarchy — routing instances are named independently and are not encoded in an interface name at all. The VLAN-tag answer is wrong for the same reason: 802.1Q tagging is configured under a logical unit's vlan-id statement, and nothing in the physical name reflects it. On a live router, show interfaces terse is the quick operational check: it lists every physical interface and its logical units side by side, making the FPC/PIC/port versus unit distinction visible at a glance.