Is the following description correct? LAN The transmission form is generally bus-based, and the most commonly used corresponding protocols are carrier sensing and collision detection CSMA/CD protocol.

Question

Options

• ATrue
• BFalse

• A
  85% (28)
• B
  15% (5)

Explanation

Option A is correct because traditional Ethernet-based LANs historically used a bus topology, where all devices share a single communication channel. In this shared medium environment, multiple devices could attempt to transmit simultaneously, creating the need for a media access control mechanism - which is precisely what CSMA/CD provides.

CSMA/CD works in two steps: devices first listen (carrier sense) before transmitting to check if the channel is idle, and if a collision occurs anyway, they detect it and back off before retrying. This makes CSMA/CD a natural fit for bus-based LANs where collisions are inherent.

Option B (False) is incorrect because the pairing of bus topology with CSMA/CD is well-established - it is the foundation of the IEEE 802.3 Ethernet standard, the dominant LAN technology.

Memory tip: Think of a bus as a single hallway where everyone shouts - CSMA/CD is the rule that says "listen before you speak, and if two people talk at once, both stop and try again." Bus + collisions → CSMA/CD.

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