THE INTERNET
In most cases a LAN or a WAN is not an isolated entity. An organisation may have more than one type of LAN at a given site to satisfy a spectrum of needs. An organisation may have multiple LANs of the same type at a given site to accommodate performance or security requirements. And an organisation may have LANs at various sites and need them to be interconnected via WANs for central control of distributed information exchange.
Fig. 42.12 The development of automatic telephony leading to ISDN
Fig. 42.13 Integrated services ...
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