Click the Exhibit button.
You are performing network tests and notice that the Layer 3 interface in the Finance VLAN on an EX Series switch is not responding to pings. You review the device status from the console.
What is causing the problem, as shown in the exhibit?
The problem is that there are no active physical ports in the Finance VLAN. According to the exhibit under 'show vlans,' the physical interfaces in the Finance VLAN are all listed under 'default-switch' and their status is not indicated in the 'show interfaces terse' output. For an IRB interface to be fully operational (up/up), there must be active physical ports in the associated VLAN. The exhibit shows that irb.30 is administratively up but the protocol is down, indicating no active physical participants in the Finance VLAN.
im not sure but the answer must be A or D - like doesnt configured at all. to be UP for IRB interface at least need UP UP 1 physical/logical interface inside bridge-domain or under VLAN hierarchy. https://community.juniper.net/communities/community-home/digestviewer/viewthread?MID=71849
Answer should be A.
From the exibit the irb.30 is physically down, henceforth the answer is A.