CompTIA A+ 1101 TCP and UDP

TCP & UDP

- transported inside of an IP packet
- encapsulated by the IP protocol
- two very common ways to move data from place to place
- operate at OSI layer 4, the transport layer
- add additional capabilities that IP, alone, can't provide, such as multiplexing (use many different applications at the same time)

TCP (Acronym)

Transmission Control Protocol, a connection-oriented protocol that ensures reliable data transmission, maintaining order and error checking.

UDP (Acronym)

User Datagram Protocol, a connectionless protocol that sends messages without establishing a connection, prioritizing speed over reliability.

TCP

- connection-orientated protocol
- uses a three-way handshake to establish a reliable connection, making it a reliable protocol (has a built in system to verify receipt of data, can recover from errors, and can manage out-out-order messages or retransmissions)
- utilizes flow control (the receiver can manage how much data is sent)

UDP

- connectionless protocol
- real-time communication (no way to stop and resend data)
- unreliable delivery
- no flow control (the sender determines how much data is transmitted)