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What is NAK? – Negative Acknowledgement ACK NAK Protocol

October 18, 2020 by freelancer

Many freelancers work in the data network industry. In the telecommunications industry and data networking industry, an acknowledgment is a signal passed between communicating processes or computers to signify acknowledgment as part of a communications protocol.

What is NAK?

SEMrush

NAK or negative acknowledgment is a protocol message that the sender receives when a message is not sent, the corrupt message is sent or when anything has gone wrong. This message might also show that the receiver’s station is not ready for transmission. Whenever this type of message is displayed, it’s mandatory to send the message again.

In practice, we can easily explain ACK NAK protocol difference:

ACK NAK protocol difference is that the NAK  protocol (negative acknowledgment) is a protocol message that is sent when something’s gone wrong, for example: “We can not hear you.”, “I don’t understand.”, while ACK or acknowledgment protocol message signifies ”OK, understand, next.”

SEMrush

See below example of TCP ACK NAK protocol:

negative acknowledgment or not acknowledged TCP example

SEMrush

One example of Negative Acknowledgement is the internet’s Transmission Control Protocol (TCP). When computers communicate via TCP and received packets, they are acknowledged by sending back a packet with an acknowledgment bit set.

Related posts:

  1. Accepting Positive and Negative Criticism
  2. What is PPTP? – Point-to-Point Tunneling Protocol
  3. Automatic Repeat Request – ARQ

Filed Under: Network

SEMrush
SEMrush

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