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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
+
+[bus]: bus.md
+[pair]: pair.md
+[push]: push.md
+[pull]: pull.md
+[req]: req.md
+[rep]: rep.md
+[sub]: sub.md
+[pub]: pub.md
+[respondent]: respondent.md
+[surveyor]: surveyor.md