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Automatic repeat request

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What is AUTOMATIC REPEAT REQUEST? What does AUTOMATIC REPEAT REQUEST mean?

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Automatic Repeat reQuests (ARQ) | O Level | By Zak

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Stop and Wait ARQ protocol by Khurram Tanvir

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ARQ(Automatic Repeat Request )

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ARQ ( Automatic Repeat Request )

Automatic repeat request (ARQ), also known as automatic repeat query, is an error-control method for data transmission that uses acknowledgements and timeouts to achieve reliable data transmission over an unreliable service. If the sender does not receive an acknowledgment before the timeout, it usually re-transmits the packet until the sender receives an acknowledgment or exceeds a predefined number of retransmissions.
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