ITPEC FE Morning October 2021 Question 32
ITPEC FE Morning October 2021 — Question 32 of 80
Flow Control (Data Link Layer) — a receiver-side mechanism to regulate how much data a sender transmits.
Flow control prevents a fast sender from overwhelming a slow receiver by signaling it to pause or continue.
- •Layer: Data Link (Layer 2)
- •Mechanism: e.g., sliding window, XON/XOFF
- •Key point: receiver controls the sender's transmission rate
Why not others:
- (a) Congestion control — manages overall network load, not receiver capacity; operates at transport layer
- (b) Error control — detects/corrects transmission errors (CRC, retransmission), not data volume
- (d) Media access control — determines which device gets access to the medium (CSMA/CD, token passing)
Key rule: Flow control = receiver tells sender "slow down"; congestion control = network tells sender "slow down."
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