Editing Alternating bit protocol (section)

{{Use American English|date = March 2019}}
{{Short description|Type of data link layer protocol about transmission fidelity}}
{{Use mdy dates|date = March 2019}}

'''Alternating bit protocol''' ('''ABP''') is a simple [[network protocol]] operating at the [[data link layer]] ([[OSI model|OSI]] layer 2){{cn|reason=this looks more like a transport layer protocol|date=April 2023}} that retransmits lost or corrupted messages using FIFO semantics. It can be seen as a special case of a [[sliding window protocol]] where a simple timer restricts the order of messages to ensure receivers send messages in turn while using a  window of 1 bit.<ref>{{cite book|last=Tel|first=Gerard|title=Introduction to distributed algorithms|year=2000|publisher=Cambridge|isbn=0521794838|pages=85}}</ref>