Lifewire app
Transmission Control Protocol and User Datagram Protocol are the two standard transport layers used with Internet Protocol.less
Both TCP and UDP use headers as part of packaging message data for transfer over network connections. TCP headers and UDP headers each contain a set of parameters called fields defined by the protocol technical specifications.ide
Each TCP header has ten required fields totaling 20 bytes (160 bits) in size. They can also optionally include an additional data section up to 40 bytes in size.ui
It takes 8 bits to equal 1 byte.this
TCP headers appear in the following sequence:spa
Source TCP port number (2 bytes or 16 bits)orm
Destination TCP port number (2 bytes or 16 bits)blog
Sequence number (4 bytes or 32 bits)three
Acknowledgment number (4 bytes or 32 bits)ip
TCP data offset (4 bits)
Reserved data (3 bits)
Control flags (up to 9 bits)
Window size (2 bytes or 16 bits)
TCP checksum (2 bytes or 16 bits)
Urgent pointer (2 bytes or 16 bits)
TCP optional data (0-40 bytes)
The headers supply specific information:
Because UDP is significantly more limited in capability than TCP, its headers are much smaller. A UDP header contains 8 bytes, divided into the following four required fields:
UDP inserts header fields into its message stream in the order listed above.
Source and destination UDP port numbers are the communication endpoints for sending and receiving devices.
The length field in UDP represents the total size of each datagram including both header and data. This field ranges in value from a minimum of 8 bytes (the required header size) to sizes above 65,000 bytes.
Similar to TCP, a UDP checksum allows receivers to cross-check incoming data for any corrupted bits of the message.