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Module 2: Data Link Layer & MAC Sublayer

20252m

Which access method listens before transmitting?

  • (i) Slotted-ALOHA
  • (ii) CSMA/CA
  • (iii) Token passing
  • (iv) ALOHA
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Answer: (ii) CSMA/CA

CSMA (Carrier Sense Multiple Access) methods sense the channel before transmitting. CSMA/CA (used in Wi-Fi) listens first and tries to avoid collisions. ALOHA and Slotted ALOHA transmit without sensing, and token passing uses a token instead.

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