Cisco S2-C2 Wide Area Networks

WANS Operate at slower speeds over wide area –Use RBOC (approximately 80% of data communications) –Use serial connections Devices include: –Routers, Modems, ATM Switches, Communication Servers Provide full- and part-time connectivity

WAN Physical Standards EIA/TIA-232 EIA/TIA-449 V.24 V.35 X.21 G.703 EIA-530

WAN Protocols HDLC – High Level Data Link Control PPPPoint to Point ISDNIntegrated Services Digital NW Frame Relay ATMAsynchronous Transmission Mode

WAN Physical Layer WAN physical layer describes the interface between the data terminal equipment (DTE) and the data circuit-terminating equipment (DCE). Typically, the DCE is the service provider and the DTE is the attached device. Services can be offered to the DTE through a modem or a CSU/DSU

WAN Technologies POTS, ISDN, X.25, Frame Relay ATM, SMDS, T1, T3 (E1, E3 in Europe) SDSL, Cable Modem, Dial-up Modem Sonet, Terrestrial Wireless, Satellite Wireless –Refer to chart to study speeds (bandwidth) and comments – both are important

Router Basics ROM – startup diagnostics, stores backup O/S RAM – where all processing takes place- stores running-config NVRAM – stores startup-config Flash – stores O/s and microcode Interface – connections through which data and packets enter router

Internetwork Services consistent end-to-end addressing addresses that represent network topologies best path selection dynamic routing switching

Lab Subnet Develop Router Topology Startup Router