What is the most popular two transport layer protocols?

• There are two types of Internet Protocol (IP) traffic. They are TCP or Transmission Control Protocol and UDP or User Datagram Protocol. TCP is connection oriented – once a connection is established, data can be sent bidirectional. UDP is a simpler, connectionless Internet protocol. Multiple messages are sent as packets in chunks using UDP.

its TCP (Transmission Control Protocol) and UDP ( User Datagram Protocol)

TCP is Reliable , UDP is Unreliable 

two most used protocols

tcp

udp

The UDP protocol & TCP protocol

TCP and UDP

TCP - Transmission control protocol 

UDP- User Datagram Protocol

TCP also konown as the connection oriented protocol..There is acknowledgment fpr every information sent using TCP..If any error has occured in the transimission ,cam be identified by a "no acknowledgment"..But time consuming mode of transmission

UDP also known as connctionless protocol..There is no acknowledgment for the infomation sent using UDP..If any error has occured, can't identify the host from which the error has happened..Its a real time protocol ,mostly used.Because less time consumed since there is no acknowledgment from the host..

Transmission Control Protocol (TCP) and User Datagram Protocol (UDP)is a transportation protocol that is one of the core protocols of the Internet protocol suite. Both TCP and UDP work at transport layer TCP/IP model and both have very different usage.

TCP and UDP .

TCP Reliable commonly used for data and UDP unreliable commonly used for voice & Video

Good points from some guys, just want to add

UDP is connection-less (send send send)

TCP connection-oriented (send, wait for ack, send, wait for ack)

Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are the most popular2 transport layer protocols.

TCP is more reliable and connection-oriented protocol, whereas UDP on the other-hand is unreliable and connectionless.

1. TCP, transmission control protocol, the reliable protocol
2. UDP, user datagram protocol, the unreliable protocol.

TCP and UDP are the two most popular protocols for this layer but i think DCCP plays very important role in this layer...