Which of the following is a distributed multi-access network that helps in supporting integrated communications using a dual bus and distributed queuing?

Question

Options

• ALogical Link Control
• BToken Ring network
• CDistributed-queue dual-bus
• DCSMA/CA

• B
  4% (1)
• C
  93% (26)
• D
  4% (1)

Explanation

Distributed-Queue Dual-Bus (DQDB) is the IEEE 802.6 standard specifically designed as a distributed multi-access network supporting integrated voice, data, and video communications over a dual-bus topology with distributed queuing - making C the precise match for every term in the question.

Why the others are wrong:

• A. Logical Link Control (LLC) is a sublayer of the Data Link layer (IEEE 802.2) that handles error checking and frame synchronization - it's not a network topology or access method.
• B. Token Ring uses a single ring topology with token-passing access control, not a dual bus or distributed queuing.
• D. CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is a contention-based channel access method used in wireless networks (802.11), unrelated to dual-bus architecture.

Memory tip: Break down the answer from the question itself - "distributed queuing" + "dual bus" = Distributed-Queue Dual-Bus. The question is practically spelling out the answer; learn to spot when question keywords map directly to an option's formal name.

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