Chapter 9. METROPOLITAN AND WIDE AREA NETWORKS
MOST ORGANIZATIONS do not build their own metropolitan or long-distance communication circuits, preferring instead to lease them from common carriers or to use the Internet. Therefore, this chapter focuses on the MAN/WAN architectures and telecommunications services offered by common carriers for use in MANs and WANs, not the underlying technology that the carriers use to provide them. We discuss the four principal types of MAN and WAN services that are available: circuit-switched services, dedicated-circuit services, packet-switched services, and virtual private network (VPN) services. We conclude by discussing how to improve MAN and WAN performance and how to select services to build MANs and WANs.
OBJECTIVES ▾
Understand circuit-switched services and architectures
Understand dedicated-circuit services and architectures
Understand packet-switched services and architectures
Understand VPN services and architectures
Understand the best practice recommendations for MAN/WAN design
Be familiar with how to improve MAN and WAN performance
CHAPTER OUTLINE
INTRODUCTION
CIRCUIT-SWITCHED NETWORKS
Basic Architecture
Plain Old Telephone Service
ISDN
DEDICATED-CIRCUIT NETWORKS
Basic Architecture
T Carrier Services
Synchronous Optical Network
PACKET-SWITCHED NETWORKS
Basic Architecture
X.25
Asynchronous Transfer Mode
Frame Relay
Ethernet Services
VIRTUAL PRIVATE NETWORKS ...
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