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# Protocols
{{hi:protocol}}
The Scalability Protocols are a principally a collection of common networking
patterns found in applications.
The following patterns are included:
## Request - Reply
The {{i:request/reply pattern}} is made up of the [_REQ_][req] and [_REP_][rep] protocols.
This most often used when implementing RPC-like services, where
a given request is matched by a single reply.
## Pipeline
The {{i:pipeline pattern}} is made up of the [_PUSH_][push] and [_PULL_][pull]
protocols.
In this pattern communication is {{i:half-duplex}}, in that one side sends
data and another side receives.
This pattern is also characterized by its ability to solve distribution
problems, and the fact that it has {{i:back-pressure}}, providing a measure
of {{i:flow control}} to data production and consumption.
## Publish - Subscribe
## Bus
## Pair
{{#include ../xref.md}}
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