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'''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>
== Design ==
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