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WAN CONCEPTS - Coggle Diagram
WAN CONCEPTS
7.2 WAN Operation
7.2.1 The concept of a WAN has been around for many years. Consider that the telegraph system was the first large-scale WAN, followed by radio, telephone system, television, and now data networks.
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7.2.2 The concept of a WAN has been around for many years. Consider that the telegraph system was the first large-scale WAN, followed by radio, telephone system, television, and now data networks. 
7.2.4 There are many types of devices that are specific to WAN environments. However, the end-to-end data path over a WAN is usually from source DTE to the DCE, then to the WAN cloud, then to the DCE to and finally to the destination DTE, as shown in the figure.
7.2.3 The WAN physical layer describes the physical connections between the company network and the service provider network.
7.2.8 Service provider networks use fiber-optic infrastructures to transport user data between destinations. Fiber-optic cable is far superior to copper cable for long distance transmissions due to its much lower attenuation and interference.
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7.1 PURPOSE OF WANs
7.1.4 Another aspect of WAN design is how an organization connects to the internet. An organization usually signs a service level agreement (SLA) with a service provider.
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7.1.2 WANs may be built by a variety of different types of organizations, as follows
A private WAN is a connection that is dedicated to a single customer. This provides for the following:
7.1.1 A Wide Area Network (WAN) is required to connect beyond the boundary of the LAN. A WAN is a telecommunications network that spans over a relatively large geographical area. A WAN operates beyond the geographic scope of a LAN.
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