
3
Copyright © 1997 Cisco Systems, Inc.
6-5CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
• Dedicated physical circuit established, maintained,
and terminated through a carrier network for each
communication session
• Datagram and data stream transmissions
• Operates like a normal telephone call
• Example: ISDN
WAN
Modem Modem
Circuit Switching
Circuit Switching
6-6CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
• Network devices share a point-to-point link to
transport packets from a source to a destination
across a carrier network
• Statistical multiplexing is used to enable devices to
share these circuits
• Examples: ATM, Frame Relay, SMDS, X.25
WAN
Modem Modem
Multiplexing
Demultiplexing
Packet Switching
Packet Switching
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