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-# __Network +__ 
-
-## __OSI Model__
-## __Layer 1__ Bites 
-  * Physical Layer 
-    * It is the connents like Cat 6 RJ45 and fiber.
-    * Its the on and off on the cables.
----
-
-## __Layer 2__ Frames
-* ### Data Link Layer.
-    * Packagers data int frames and transmits those frames on the network.
-    * Layer 2 devices view nteworks __logically__.
-* ### MAC Address 
-    * Media Access Control
-    * Physical addressing system of a device which operates on the logial topology.
-    * Uses a 48-bit address assigned to a network interface card. 
-    * __EX:__ `D2:51:F1:3A:34:65` 
-    * `D2:51:F1` is the vedor code 
-* ### Logical Link Control
-    * Provides connection services and allows acknowledgemnt of receipt of message.
-    * Is the basic form of flow control.
-    * Provides basic error control functios.
-    * Uses a check sum. 
-* ### How communication synchronized.
-    * Isochronous
-        * Netwok devices use a common reference a common refernce clock source and create time slots for transmission.
-    * Synchronous 
-        * Network devices agree on clocking method to indicate beginning and end of frames and can use control characters. 
-    * Asynchonous
-        * Network devices reference thier own internal clocks and use start and stop bits 
-* ### What Devices are layer 2
-    * network cards
-    * Briges
-    * Switch
-    * MAC Address
----
-## __Layer 3__ Packets
-
-* ### Network Layer
-    * Forwards traffic (routing) with logical address. 
-    * __IP address__ IPv4 IPv6
-    * Logical addressing 
-        * Ip Addressing  IPv4 and IPv6
-    * Switching (Routing)
-    * Route discovery and selction
-    * Connection Services 
-    * Banwidth usage
-    * Multiplexing
-* ### How should data be __forward__ or __routed__ 
-    * Packet Switching (Most common)
-        * Data is divided into packets and then forwarded to is IP address.
-    * Circuit Switching
-        * Dedicated communication link is establed between two devices.
-        * It uses one path when the connect establed and the whole time the connect is there. 
-    * Message Switching
-        * Data is divided into messages which may be stored and then forwarded. 
-* ### Route Discovery and Selection
-    * Manually configured as a static route or dynamically through.
-* ### Connection Services
-    * Augment Layer 2 connection services to improve reliability
-    * Flow Control 
-    * Packet reordering
-* ### Internet Control Message Protocol
-    * Sends error messages and operational information to an IP destination.
-        * `Ping`
-        * Trace Route `tracert`
-* ### Devices 
-    * __Routers__ 
-    * Multilayer switches
-* ### Protocol 
-    * __IPv4__
-    * __IPv6__ 
-    * ICMP
-
----
-
-## __Layer 4__ Segments
-* ### Transport Layer
-    * TCP Transmission Control Protocol
-        * Connection-oriented protocol that is a reliable way to transport segments across the network 
-        * Will ask for an acknowledgement  
-        * ![TCP](./pics/tcp.png) 
-        * This is a Three-way handshake.
-    
-
-    * UDP User Datagram Protocol
-        * Connectionless protocol that is an unreliable way to transport segments across the network 
-
-    * Windowing
-    * Buffering