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Cisco IP Telephony Solution Reference Network Design
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Chapter 2 Network Infrastructure
Figure 2-1
Typical Campus Network Infrastructure
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IP
IP
IP
IP
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IP
IP
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IP
IP
IP
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Central Site
Campus access
layer
Campus distribution
layer
Campus core
layer
Branch
router
Branch
switch
WAN aggregation
ISDN backup
IP WAN
PSTN
Branch offices
77290