Add Communication intro image

pull/5/head
Donne Martin 2017-03-01 20:43:44 -08:00
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@ -1443,3 +1443,11 @@ If queues start to grow significantly, the queue size can become larger than mem
* [Applying back pressure when overloaded](http://mechanical-sympathy.blogspot.com/2012/05/apply-back-pressure-when-overloaded.html)
* [Little's law](https://en.wikipedia.org/wiki/Little%27s_law)
* [What is the difference between a message queue and a task queue?](https://www.quora.com/What-is-the-difference-between-a-message-queue-and-a-task-queue-Why-would-a-task-queue-require-a-message-broker-like-RabbitMQ-Redis-Celery-or-IronMQ-to-function)
## Communication
<p align="center">
<img src="http://i.imgur.com/5KeocQs.jpg">
<br/>
<i><a href=http://www.escotal.com/osilayer.html>Source: OSI 7 layer model</a></i>
</p>