20. wan overview
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WAN Connections
UnderstandingWAN Technologies
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Wide-Area Network
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Need for WANs
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WANs vs. LANs
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WAN Access and the OSI Reference
Model
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WAN Devices
Routers
Terminal servers
Modems
DSU/CSUWAN networking devices
oATM switches
oFrame Relay switches
oPSTN
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Physical Layer: WANs
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Serial Point-to-Point Connections
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WANMultiple LANs
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WAN Data-Link Protocols
HDLC
PPP
Frame Relay (LAPF)
ATM
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WAN Link Options
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Circuit Switching
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Public Switched Telephone Network
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PSTN Considerations
Advantages
Simplicity
Availability
Cost
Disadvantages
Low data rates
Relatively long connection setup time
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Leased Line
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WAN Connection Bandwidth
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Configuring a Serial Interface
Enter global
configuration mode.
RouterX(config-if)#clock rate 64000
RouterX(config-if)#
RouterX(config)#interface serial 0/0/0
RouterX(config-if)#
RouterX#configure terminal
RouterX(config)#
RouterX(config-if)#bandwidth 64
RouterX(config-if)#exit
RouterX(config)#exit
RouterX#
Specify interface.
Set clock rate
(on DCE interfaces only).
Set bandwidth
(recommended).
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Serial Interface show controller
Command
Shows the serial cable type
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