In computer networking, a reliable protocol is one that provides reliability properties with respect to the delivery of data to the intended recipient(s), as opposed to an unreliable protocol, which does not provide notifications to the sender as to the delivery of transmitted data. A reliable multicast protocol may ensure reliability on a per-recipient basis, as well as provide properties that relate the delivery of data to different recipients, such as e.g.

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  • In computer networking, a reliable protocol is one that provides reliability properties with respect to the delivery of data to the intended recipient(s), as opposed to an unreliable protocol, which does not provide notifications to the sender as to the delivery of transmitted data. A reliable multicast protocol may ensure reliability on a per-recipient basis, as well as provide properties that relate the delivery of data to different recipients, such as e.g. total order, atomicity, or virtual synchrony. Reliable protocols typically incur more overhead than unreliable protocols, and as a result, are slower and less scalable. This often isn't an issue for unicast protocols, but it may be a problem for multicast protocols. TCP, the main protocol used in the Internet today, is a reliable unicast protocol. UDP, often used in computer games or other situations where speed is an issue and the loss of a little data is not, is an unreliable protocol. Often, a reliable unicast protocol is also connection-oriented. For example, the TCP/IP protocol is connection-oriented, with the virtual circuit ID consisting of source and destination IP addresses and port numbers. Some unreliable protocols are connection-oriented as well. These include ATM and Frame Relay, on which a substantial part of all Internet traffic is passed.
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  • In computer networking, a reliable protocol is one that provides reliability properties with respect to the delivery of data to the intended recipient(s), as opposed to an unreliable protocol, which does not provide notifications to the sender as to the delivery of transmitted data. A reliable multicast protocol may ensure reliability on a per-recipient basis, as well as provide properties that relate the delivery of data to different recipients, such as e.g.
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  • Reliability (computer networking)
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