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- Q3304290 subject Q7215415.
- Q3304290 abstract "Alternating bit protocol (ABP) is a simple network protocol operating at the data link layer that retransmits lost or corrupted messages. It can be seen as a special case of the 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.Messages are sent from transmitter A to receiver B. Assume that the channel from A to B is initialized and that there are no messages in transit. Each message from A to B contains a data part and a one-bit sequence number, i.e., a value that is 0 or 1. B has two acknowledge characters that it can send to A: ACK0 and ACK1.When A sends a message, it resends it continuously, with the same sequence number, until it receives an acknowledgment from B that contains the same sequence number. When that happens, A complements (flips) the sequence number and starts transmitting the next message.When B receives a message that is not corrupted and has sequence number 0, it starts sending ACK0 and keeps doing so until it receives a valid message with number 1. Then it starts sending ACK1, etc.This means that A may still receive ACK0 when it is already transmitting messages with sequence number one. (And vice versa.) It treats such messages as negative-acknowledge characters (NAKs). The simplest behaviour is to ignore them all and continue transmitting.The protocol may be initialized by sending bogus messages and acks with sequence number 1. The first message with sequence number 0 is a real message.".
- Q3304290 wikiPageWikiLink Q10860200.
- Q3304290 wikiPageWikiLink Q131222.
- Q3304290 wikiPageWikiLink Q132364.
- Q3304290 wikiPageWikiLink Q1339255.
- Q3304290 wikiPageWikiLink Q16845229.
- Q3304290 wikiPageWikiLink Q190157.
- Q3304290 wikiPageWikiLink Q190558.
- Q3304290 wikiPageWikiLink Q194134.
- Q3304290 wikiPageWikiLink Q2248190.
- Q3304290 wikiPageWikiLink Q288445.
- Q3304290 wikiPageWikiLink Q592860.
- Q3304290 wikiPageWikiLink Q628523.
- Q3304290 wikiPageWikiLink Q7215415.
- Q3304290 wikiPageWikiLink Q733553.
- Q3304290 comment "Alternating bit protocol (ABP) is a simple network protocol operating at the data link layer that retransmits lost or corrupted messages. It can be seen as a special case of the 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.Messages are sent from transmitter A to receiver B. Assume that the channel from A to B is initialized and that there are no messages in transit.".
- Q3304290 label "Alternating bit protocol".