Reliability (computer networking): Difference between revisions

Revision as of 16:46, 20 February 2020

Revision as of 15:50, 17 March 2020

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{{Use American English|date=January 2020}}

In [[computer networking]], a '''reliable''' protocol is a [[communication protocol]] that notifies the sender whether or not the delivery of data to intended recipients was successful. Reliability is a synonym for '''assurance''', which is the term used by the [[ITU]] and [[ATM Forum]].

Reliable protocols typically incur more overhead than unreliable protocols, and as a result, function more slowly and with less scalability. This often is not an issue for [[unicast]] protocols, but it may become a problem for [[reliable multicast]] protocols.

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Strong reliability properties are offered by [[group communication system]]s (GCSs) such as [[IS-IS]], [[Appia framework]], [[Spread (group communication system)|Spread]], [[JGroups]] or [[QuickSilver Scalable Multicast]]. The [[QuickSilver Properties Framework]] is a flexible platform that allows strong reliability properties to be expressed in a purely declarative manner, using a simple rule-based language, and automatically translated into a hierarchical protocol.

One [[protocol (computing)|protocol]] that implements reliable messaging is [[WS-ReliableMessaging]], which handles reliable delivery of [[SOAP]] messages.<ref>[http://download.boulder.ibm.com/ibmdl/pub/software/dw/specs/ws-rm/ws-reliablemessaging200502.pdf WS-ReliableMessaging specification (PDF)]</ref><!--[[User:Kvng/RTH]]-->

In the context of theThe [[Asynchronous Transfer Mode|ATM]] Service-Specific Coordination Function, for exampleprovides for transparent assured delivery with [[ATM Adaptation Layer 5|AAL5]].<ref>Young-ki Hwang, et al., ''Service Specific Coordination Function for Transparent Assured Delivery with AAL5 (SSCF-TADAS)'', Military Communications Conference Proceedings, 1999. MILCOM 1999, vol.2, pages 878–882. {{doi|10.1109/MILCOM.1999.821329}} </ref><ref name="ATMF-INTRO" >ATM Forum, The User Network Interface (UNI), v. 3.1, {{ISBN|0-13-393828-X}}, Prentice Hall PTR, 1995.</ref><ref name ="AAL-5 spec">ITU-T, ''B-ISDN ATM Adaptation Layer specification: Type 5 AAL'', Recommendation I.363.5, International Telecommunication Union, 1998.</ref>

[[IEEE 802.11]] attempts to provide reliable service for all traffic. The sending station will resend a frame if the sending station doesn't receive an ACK frame within a predetermined period of time.<!--[[User:Kvng/RTH]]-->

==Real-time systems==