ITPEC FE Morning April 2021 Question 31
ITPEC FE Morning April 2021 — Question 31 of 80
CSMA/CD LAN transmission — identify the access method used in Ethernet LANs.
CSMA/CD = Carrier Sense Multiple Access with Collision Detection:
- •Carrier Sense — node listens and waits for the medium to be idle
- •Multiple Access — multiple nodes share the same medium
- •Collision Detection — if collision occurs, node stops and waits a random backoff time before retransmitting
Why not others:
- (a) Ring topology + special frame — describes Token Ring
- (b) Transmission right passed in order — describes Token Passing
- (d) Time slot assigned — describes TDMA (Time Division Multiple Access)
Key rule: "listen → transmit → collision → random wait → retry" = CSMA/CD (Ethernet).
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