Wide Area Networks

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	The key elements that define a well designed WAN
	Key devices include WAN switches, access servers, modems, and CSU/DSUs
	Clients are faced with a host of transmission options and clients pay telephone service providers for WAN connections such as: Plain Old Telephone Service (POTS) Private Lines ISDN N x T1 Leased Lines Frame Relay X.25, etc. ADSL
	Bandwidth optimization features are essential for controlling WAN costs.
	Switching methods vary and include point-to-point, circuit switching, packet switching, dialup, and WAN virtual circuits

w Minimize bandwidth costs w Maximize efficiency w Maximize performance w Support new/emerging applications w Maximize availability w Minimize management and maintenance
	w Multi-service consolidation w Bandwidth efficiency w Performance and QoS guarantees w Emerging IP Services w Carrier-class reliability w Ease of operation and management