Network topologies – FDDI: Fiber Distributed Data Interface (FDDI) primarily uses which logical network topology?

Introduction / Context:
FDDI (Fiber Distributed Data Interface) is a LAN/MAN technology standardized for high-speed optical networking. Recognizing its topology helps differentiate it from Ethernet bus/star designs and token-based rings like Token Ring, even though implementations may use star-wired physical layouts.

Given Data / Assumptions:

• FDDI operates typically at 100 Mbps using fiber optic media.
• FDDI defines a dual-ring of trees architecture for resilience.
• Physical wiring can be star-like via concentrators, but the logical topology is ring.

Concept / Approach:

FDDI employs a token-passing mechanism over a primary and secondary ring for fault tolerance. Even when connected through concentrators, the logical data path forms a ring. Therefore, its primary logical topology is ring.

Step-by-Step Solution:

Verification / Alternative check:

Topology diagrams in FDDI documentation show primary and secondary rings connecting stations or concentrators in a loop. Fault scenarios illustrate ring wrap for continuity.

Why Other Options Are Wrong:

b: Star describes physical wiring possible via concentrators, not the logical topology.

c: Mesh is not the canonical FDDI topology.

d: Bus aligns with early Ethernet (10BASE2/5), not FDDI.

e: Not applicable because “Ring network” is correct.

Common Pitfalls:

Confusing physical cabling patterns with logical flow; overlooking the secondary ring’s role in resilience and misconstruing it as a different topology.

Final Answer:

Ring network