How does a TCP sliding window work?

To address this, sliding window protocols allow a selected number of packets, the window, to be sent without having to wait for an ACK. Each packet receives a sequence number, and the ACKs send back that number. The protocol keeps track of which packets have been ACKed, and when they are received, sends more packets.

Does TCP use sliding window?

Transmission Control Protocol (TCP) uses a sliding window for flow control. Before you tune any TCP/IP settings, first understand how the TCP sliding window works.

What is the mechanism of sliding window flow control?

Sliding window protocol is a flow control protocol. It allows the sender to send multiple frames before needing the acknowledgements. Sender slides its window on receiving the acknowledgements for the sent frames. This allows the sender to send more frames.

What are the four divisions made in the sliding window?

Types of Sliding Window Protocol

• Go-Back-N ARQ.
• Selective Repeat ARQ.

How does a TCP sliding window work and what does it mean?

A TCP window is the amount of unacknowledged data a sender can send on a particular connection before it gets an acknowledgment back from the receiver, that it has received some of the data.

How is the window size determined in TCP?

Like we mentioned above, the TCP window size (also called the receive window) is the amount of free space in the server’s receive buffer. This value is returned to the sender in the TCP header of an acknowledgment and provides a limit to the amount of data the sender can transmit before waiting for another acknowledgement.

How does the send Window work in TCP?

The Send Window is the sum of Bytes sent but not acknowledged and Bytes the receiver is ready to accept (Usable Window). A visual demo of TCP Sliding Window mechanism can be viewed here.

What’s the difference between a sliding window and a fixed window?

• The big difference is the size of the sliding window size at the receiver is not fixed. • The receiver advertises an adjustable window size (AdvertisedWindow field in TCP header). • Sender is limited to having no more than AdvertisedWindow bytes of unACKed data at any time. ACN: TCP Sliding Windows 13 TCP Flow Control