350-401 Question 191

Community Discussion

Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.

• Chose C1

  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.

• Chose C1

  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.

• Chose C1

  C is correct others not sending hello and are passive