In terms of the OSI model, IP is a network-layer protocol. It provides a connectionless data transmission service, and supports both TCP and UDP. Data is transmitted link by link; an end-to-end connection is never set up during the call.

Is IP connectionless and unreliable?

The third network-level protocol is the Internet Protocol (IP), which provides unreliable, connectionless packet delivery for the Internet. IP is connectionless because it treats each packet of information independently.

What are the examples for connectionless protocols?

Notable connectionless protocols are: Internet Protocol (IP), User Datagram Protocol (UDP), Internet Control Message Protocol (ICMP), Internetwork Packet Exchange (IPX), Transparent Inter-process Communication, NetBIOS, and Fast and Secure Protocol (FASP).