Connectionless communication

connectionlessconnectionless protocolconnectionless mode transmissionconnectionless modeconnectionless network serviceconnectionless serviceconnectionless-mode transmission
Connectionless communication, often referred to as CL-mode communication, is a data transmission method used in packet switching networks in which each data unit is individually addressed and routed based on information carried in each unit, rather than in the setup information of a prearranged, fixed data channel as in connection-oriented communication.wikipedia
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Connection-oriented communication

connection-orientedconnection orientedconnection-oriented protocol
Connectionless communication, often referred to as CL-mode communication, is a data transmission method used in packet switching networks in which each data unit is individually addressed and routed based on information carried in each unit, rather than in the setup information of a prearranged, fixed data channel as in connection-oriented communication.
The alternative to connection-oriented transmission is connectionless communication, for example the datagram mode communication used by the IP and UDP protocols, where data may be delivered out of order, since different network packets are routed independently, and may be delivered over different paths.

User Datagram Protocol

UDPUDP/IPUDP protocol
Internet Protocol (IP) and User Datagram Protocol (UDP) are connectionless protocols.
UDP uses a simple connectionless communication model with a minimum of protocol mechanisms.

Packet switching

packet-switched networkpacket switchedpacket-switched
Connectionless communication, often referred to as CL-mode communication, is a data transmission method used in packet switching networks in which each data unit is individually addressed and routed based on information carried in each unit, rather than in the setup information of a prearranged, fixed data channel as in connection-oriented communication.
Packet switching may be classified into connectionless packet switching, also known as datagram switching, and connection-oriented packet switching, also known as virtual circuit switching.

Internet Protocol

IPIP protocolInternet Protocol (IP)
Internet Protocol (IP) and User Datagram Protocol (UDP) are connectionless protocols.
Historically, IP was the connectionless datagram service in the original Transmission Control Program introduced by Vint Cerf and Bob Kahn in 1974, which was complemented by a connection-oriented service that became the basis for the Transmission Control Protocol (TCP).

Datagram

datagramsIP datagramdatagram service
A packet transmitted in a connectionless mode is frequently called a datagram.
Datagrams provide a connectionless communication service across a packet-switched network.

Transmission Control Protocol

TCPTCP/IPACK
Applications that do not require reliable data stream service may use the User Datagram Protocol (UDP), which provides a connectionless datagram service that emphasizes reduced latency over reliability.

Router (computing)

routerroutersnetwork router
By establishing a connection at the beginning of such a data exchange the components (routers, bridges) along the network path would be able to pre-compute (and hence cache) routing-related information, avoiding re-computation for every packet.
Second, they were connectionless devices, which had no role in assuring that traffic was delivered reliably, leaving that entirely to the hosts.

Fast and Secure Protocol

FASP
Similar to the connectionless UDP protocol, FASP does not expect any feedback on every packet sent.

Communication protocol

protocolcommunications protocolprotocols
Underlying this transport layer is a datagram delivery and routing mechanism that is typically connectionless in the Internet.

NetBIOS

NetBEUINetBIOS session serviceNetBIOS/NetBEUI
Datagram mode is connectionless; the application is responsible for error detection and recovery.

Transmission (telecommunications)

transmissiontransmissionstransmit
Connectionless communication, often referred to as CL-mode communication, is a data transmission method used in packet switching networks in which each data unit is individually addressed and routed based on information carried in each unit, rather than in the setup information of a prearranged, fixed data channel as in connection-oriented communication.

Stateless protocol

statelessStateless serverstateful protocol
Connectionless protocols are usually described as stateless protocols because the end points have no protocol-defined way to remember where they are in a "conversation" of message exchanges.

Multicast

multicastinggroup addressingInteractive Multicast
It also allows for multicast and broadcast operations in which the same data are transmitted to several recipients in a single transmission.

Broadcasting (networking)

broadcastbroadcastingbroadcasts
It also allows for multicast and broadcast operations in which the same data are transmitted to several recipients in a single transmission.

Error

gaffegaffesmistake
In connectionless transmissions the service provider usually cannot guarantee that there will be no loss, error insertion, misdelivery, duplication, or out-of-sequence delivery of the packet.

Sequence

sequencessequentialinfinite sequence
In connectionless transmissions the service provider usually cannot guarantee that there will be no loss, error insertion, misdelivery, duplication, or out-of-sequence delivery of the packet.

Bridging (networking)

bridgebridgingnetwork bridge
By establishing a connection at the beginning of such a data exchange the components (routers, bridges) along the network path would be able to pre-compute (and hence cache) routing-related information, avoiding re-computation for every packet.

Cache (computing)

cachecachingcache memory
By establishing a connection at the beginning of such a data exchange the components (routers, bridges) along the network path would be able to pre-compute (and hence cache) routing-related information, avoiding re-computation for every packet.