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WANS _ Routers

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

What is a WAN?
 A Collection of LANs within 1 or

many Autonomous networks.  Single or many remote Dial-up users.  A Collection of routers spread across a large geographic area.

Router
Cardiff Office

Router
Branch Office

H.Q.
(CORE ROUTER)

Router
Super Rep London office

Router
Edinburgh Office

Example WAN
Router
Branch Office

Router
Cardiff Office

LAN

LAN

H.Q.
(CORE ROUTER)

Router
London office

LAN

LAN Router

Super Rep

LAN

Edinburgh Office

WAN Types
Router
Branch Office’s

Router
Cardiff Office

LAN
Enterprise Network

LAN
Stub Network

H.Q.
(CORE ROUTER)

Router
Mobile London office

LAN

LAN Router

Users
Super Rep

LAN

Edinburgh Office

Wan and Routers
 WANs operates at the  Routers operates at the

physical layer and the data link layer of the OSI model  Connects devices that are seperated by wide geographical areas

network layer of the OSI model  Communicates with each other using WAN connections with the help of routing protocols and routed protocols

Router’s Functions
 Selection of best path for incoming data

packets  Switching of packets to the proper outgoing interfaces

Router’s Protocols
 Routing protocols – enables a packet to be

forwarded from one host to another based on the addressing scheme  Routed protocols – provides mechanisms for sharing routing information between routers to update the routing tables

A Router’s Internal Configuration
 RAM/DRAM  NVRAM
 Flash

 ROM  Interface.

Different roles of a Router
 Internal routers  Area border routers
 Backbone routers

 Autonomous system boundary routers

Router Capacities
 H.Q. would typically have a large core

router at the heart of the enterprise network such as a Cisco 6000.  Other major offices would have scalable devices such as Cisco 2500/3600 series routers with spare interface capacity.  Whereas Branch offices would generally have Cisco 1600/1700 series routers.

The End


				
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