Network topologies – FDDI: Fiber Distributed Data Interface (FDDI) primarily uses which logical network topology?
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ARing network
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BStar network
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CMesh network
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DBus-based network
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ENone of the above
Answer
Correct Answer: Ring network
Explanation
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:
Recall that FDDI uses token passing, characteristic of ring topologies.Understand the “dual ring” concept: primary for traffic, secondary for backup or counter-rotating traffic.Note the distinction between physical and logical topologies; logical remains ring.Choose the option that states “Ring network.”Confirm with standard references on FDDI architecture.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