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What do you mean by window 16 for TCP?
Window (16 bits): The receive window. The number of bytes that the sender of this segment is willing to receive. A key feature of TCP flow control. Urgent pointer (16 bits): If the sender sets the URG flag, then this 16-bit field is an offset from the sequence number indicating the last urgent data byte.
What is my TCP window size?
The TCP window size field controls the flow of data and is limited to 2 bytes, or a window size of 65,535 bytes. Since the size field can’t be expanded, a scaling factor is used.
What is the send window size?
Sliding Window Protocol: Sender. As you might expect, the client has a send window to match the server’s receive window. The size of the send window is the total number of bytes that the client is allowed to have unacknowledged at a time.
What is window size TCP header?
The TCP header value allocated for the window size is two bytes long. This means that the highest possible numeric value for a receive window is 65,535 bytes.
How does TCP work?
TCP provides communication between an application program and the Internet Protocol (they are frequently written as TCP/IP.) While IP handles actual delivery of the data, TCP keeps track of ‘segments’ – the individual units of data transmission that a message is divided into for efficient routing through the network.
What is the window size of a TCP connection?
The TCP window size, or as some call it, the TCP receiver window size, is simply an advertisement of how much data (in bytes) the receiving device is willing to receive at any point in time. The receiving device can use this value to control the flow of data, or as a flow control mechanism.
How does a sliding window work in TCP?
One of the most clever features of TCP is the concept of a sliding window. Devices can change the window size dynamically, making it smaller when there’s congestion and bigger when things are clear. Each device sends the other a suggested window size that says how much data it wants to receive before getting an acknowledgement.
How is the size of the send window determined?
The size of the send window is the total number of bytes that the client is allowed to have unacknowledged at a time. In general, the send window is bounded by the minimum of its send buffer size and the server’s receive window size, but it is also affected by network congestion and the number of sent but unacknowledged bytes.
How big is the TCP Receive Window in RFC 1323?
In its native state, TCP cannot take advantage of these high-performance links since it can only send a maximum of 65,535 bytes at a time. For this reason, TCP Options were introduced in RFC 1323 that enable the TCP receive window to be increased exponentially.