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ACK (ACKnowledgement)

What>>>>>>>>>>>>>>>>>>>>>>>>> is ACK (ACKnowledgement)? ACK (ACKnowledgement) is a signal used in data transmission to confirm to a receiver that commands or data have been received or processed. The TCP and DHCP network protocols are examples of network protocols that use ACK (ACKnowledgement) signals for various purposes.

Transmission Control Protocol

The Transmission Control Protocol (TCP) defines how data is exchanged between network participants on the Internet.

When a connection is established, the requested server sends back a so-called SYN/ACK data packet(SYN from synchronize) in response to a request from a Client. The Client confirms this with its own ACK packet. This establishes the connection.
When the connection is terminated, the sender transmits a FIN packet stating that the sender will not send any further data. The receiver acknowledges receipt with a ACK packet and also sends a FIN packet. The other end also responds with a ACK packet.

Dynamic Host Configuration Protocol

A server uses the Dynamic Host Configuration Protocol (DHCP) to assign a network configuration to a Client server. With a so-called DHCPACK message, a DHCP server confirms to a Client its request for an IP address offered to it. Furthermore, this message confirms a request from the Clients for the transmission of configuration parameters.

DHCPNAK is the counterpart, a rejecting message.


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