Refer to the exhibit. A network engineer configures OSPF and reviews the router configuration. Which interface or interfaces are able to establish OSPF adjacency?
“No Hellos (Passive Interface)”. If you configure passive interface then the network on the interface will still be advertised but it won’t send any OSPF hello packets. This way it’s impossible to form an OSPF neighbor adjacency.
The correct answer is C. only GigabitEthernet0/0. Here's the explanation:
GigabitEthernet0/0:
This interface has a state of DROTHER.
It shows Hello messages are being sent (Hello due in 00:00:07).
There is no indication of it being in passive mode, meaning it can form an OSPF adjacency.
GigabitEthernet0/1:
This interface shows "No Hellos (Passive interface)", meaning it's configured as a passive interface and does not send or receive OSPF Hello packets.
Because it’s in passive mode, it cannot form an adjacency.
GigabitEthernet0/1.40:
This sub-interface is also configured as a passive interface, shown by the statement "No Hellos (Passive interface)".
It cannot form an adjacency because it does not exchange Hello packets.
Thus, only GigabitEthernet0/0 is capable of forming an OSPF adjacency.
If you configure passive interface then the network on the interface will still be advertised but it won’t send any OSPF hello packets. This way it’s impossible to form an OSPF neighbor adjacency, but it can still advertise its networks to other routers. The default mode is active.
"No backup designated router" for GigabitEthernet0/1 and GigabitEthernet0/1.40.
both interfaces have 'broadcast' configured for their network types, meaning there should be a BDR if any adjacency has been formed.
option C makes most sense.
The state on the interfaces are clearly shown. Two of them are DR while one is DBROTHER. One of the DR interface is a sub-interface of the other. I will therefore eliminate DBROTHER and pick the interface and sub-interface - "D" is the correct answer
The right answer is C.
When an interface is a passive-interface do not receive and send hello messages, so they cannot establish an ospf neighborship without these messages.
The only interface that is not passive is the G0/0 so the answer is C.
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