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Understanding the Network: A Practical Guide to Internetworking by Martin J. Michael

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Chapter 5. WAN Internetworking Technologies

In this chapter, we look at WAN internetworking technologies. When we examine this subject, the first thing we notice is the clear separation between physical transport (OSI-RM Layer 1) and data transmission (OSI-RM Layer 2) services. This separation contrasts sharply with LAN technologies, where the services are handled by both layers under the same protocol specification. This delineation might seem odd to administrators who have most of their experience with LAN protocols, but it is characteristic of WAN networking, and reflects the utilitarian nature of the Public Switched Telephone Network (PSTN) that provide transport service.

PSTN was originally developed for voice transport, which required ...

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