Web Reference: Dec 30, 2025 · ARQ (Automatic Repeat Request), also known as Automatic Repeat Query, is an error-control mechanism used to ensure reliable data transmission in a two-way communication system. ARQ is used to achieve reliable data transmission over an unreliable communication channel. ARQ is appropriate if the communication channel has varying or unknown capacity. Variations of ARQ protocols include Stop-and-wait ARQ, Go-Back-N ARQ, and Selective Repeat ARQ. Mar 8, 2026 · ARQ, short for Automatic Repeat Request, is an error-control method used in data communications where the receiver detects errors in received data and asks the sender to retransmit anything that arrived corrupted or went missing.
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