WANS & Routers By Scott Burden & Linnea Wong Cisco Network Academy Semester 2

What is a WAN? 4 A Collection of LANs within 1 or many Autonomous networks. 4 Single or many remote Dial-up users. 4 A Collection of routers spread across a large geographic area. Router Cardiff Office Router Branch Office Router London office H.Q. (CORE ROUTER) Router Edinburgh Office Super Rep

Example WAN Router Cardiff Office Router London office H.Q. (CORE ROUTER) Router Edinburgh Office Super Rep LAN Router Branch Office LAN

WAN Types Router Cardiff Office Router London office H.Q. (CORE ROUTER) Router Edinburgh Office Super Rep LAN Router Branch Office’s LAN Stub Network Enterprise Network Mobile Users

Wan and Routers 4 WANs operates at the physical layer and the data link layer of the OSI model 4 Connects devices that are seperated by wide geographical areas 4 Routers operates at the network layer of the OSI model 4 Communicates with each other using WAN connections with the help of routing protocols and routed protocols

Router’s Functions 4 Selection of best path for incoming data packets 4 Switching of packets to the proper outgoing interfaces

Router’s Protocols 4 Routing protocols – enables a packet to be forwarded from one host to another based on the addressing scheme 4 Routed protocols – provides mechanisms for sharing routing information between routers to update the routing tables

A Router’s Internal Configuration 4 RAM/DRAM 4 NVRAM 4 Flash 4 ROM 4 Interface.

Different roles of a Router 4 Internal routers 4 Area border routers 4 Backbone routers 4 Autonomous system boundary routers

Router Capacities 4 H.Q. would typically have a large core router at the heart of the enterprise network such as a Cisco Other major offices would have scalable devices such as Cisco 2500/3600 series routers with spare interface capacity. 4 Whereas Branch offices would generally have Cisco 1600/1700 series routers.

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