Refer to the exhibit:

An engineer wants to authenticate the OSPF neighbor between PEA and PE-B using MD5.
Which command on PE-B successfully completes the configuration?
A)

B)

C)

D)

Drag and drop the descriptions from the left onto the corresponding OS types on the right.

Refer to the exhibit:

Which condition must be met by the OSPF peer of router R1 before the two devices can establish communication?

Refer to the exhibit:

After implementing a new design for the network, a technician reviews the pictured CLI output as part of the MOP.
Which two statements describe what the technician can ascertain from the ImpNull output? (Choose two.)

Refer to the exhibit:

Which configuration prevents the OSPF neighbor from establishing?