Which interface type is explicitly associated with Fiber Distributed Data Interface in the OSPF note?

Which interface type is explicitly associated with Fiber Distributed Data Interface in the OSPF note?

• A. HDLC
• B. Frame Relay
• C. FDDI
• D. X.25

Answer: (C)

In OSPF, each interface is tied to the underlying data-link technology, and the interface type name reflects that technology. For a Fiber Distributed Data Interface network, the interface type is FDDI. That naming directly matches the fiber LAN standard, making it the explicit association in the OSPF notes. The other options correspond to different technologies: HDLC is a common serial encapsulation, Frame Relay is a WAN protocol, and X.25 is an older packet-switching network. None of these are fiber LAN standards, so they aren’t the interface type linked with FDDI.

In OSPF, each interface is tied to the underlying data-link technology, and the interface type name reflects that technology. For a Fiber Distributed Data Interface network, the interface type is FDDI. That naming directly matches the fiber LAN standard, making it the explicit association in the OSPF notes.

The other options correspond to different technologies: HDLC is a common serial encapsulation, Frame Relay is a WAN protocol, and X.25 is an older packet-switching network. None of these are fiber LAN standards, so they aren’t the interface type linked with FDDI.