gh-148 adding devp2p to side bar and setting up devp2p page

Author: raa-dev

docs/wiki/EL/devp2p.md

@@ -1,7 +1,50 @@
-# Execution p2p
+# DevP2P
 
-> :warning: This article is a [stub](https://en.wikipedia.org/wiki/Wikipedia:Stub), help the wiki by [contributing](/contributing.md) and expanding it.
+This section will cover the networking protocol used by the Execution Layer (EL).
+First, we will provide some background on computer networks and then we will dive into the
+specifics of the EL's networking protocol.
 
-The execution layer implements [devp2p](https://github.com/ethereum/devp2p) as its communication protocol with nodes in the network. It includes various subprotocols and features: eth, snap, les, pip, wit. 
+## Computer networks background
+* Distributed network of nodes
+* OSI vs TCP/IP model
+## EL's networking specs
+* peer-to-peer networking protocol
+* gossiping data (1:N) and request/response (1:1) communication
+* Client software divided into Execution and Consensus (each one have its own p2p network)
+* Execution network propagates transactions
+* Two network stacks:
+  * UDP-based transport layer (discovery and finding peers)
+  * TCP-based transport layer (devp2p, exchange information) 
+* Discovery protocol
+  * bootstrap nodes
+  * Kademlia
+  * Hash tables
+  * PING/PONG hashed messages
+  * Find neighbours: list of peers
 
-Because libp2p (used by CL) was not ready when Ethereum was created, devp2p was created as Ethereum's own p2p protocol stack. 
+start client --> connect to bootnode --> bond to bootnode --> find neighbours --> bond to neighbours
+
+## ENR: Ethereum Node Records
+* Node's identity
+* Object
+  * signature (hash)
+  * sequence number
+  * arbitrary key-value pairs
+
+## DevP2P specs
+* RLPx: encrypted and authenticated transport protocol
+  * Handshake messaging
+  * Encryption
+  * Authentication
+* RLP: Recursive Length Prefix encoding
+* Multiplexing: multiple subprotocols
+* Subprotocols
+  * LES: Light Ethereum Subprotocol
+  * Witness Subprotocol
+  * Wire Subprotocol
+  * SHH: Whisper Subprotocol
+
+
+### Further Reading
+* [Geth devp2p docs](https://geth.ethereum.org/docs/tools/devp2p)
+* [Ethereum devp2p GitHub](https://github.com/ethereum/devp2p)