tailieunhanh - Lecture Business data communications and networking (8e): Chapter 9 - Jerry Fitzgerald, Alan Dennis

Chapter 9 - Metropolitan and wide area networks. In this chapter, the following content will be discussed: Introduction, circuit switched networks, dedicated circuit networks, packet switched networks, virtual private networks, best practice MAN/WAN design improving MAN and WAN performance. | Business Data Communications and Networking 8th Edition Jerry Fitzgerald and Alan Dennis John Wiley & Sons, Inc Prof. M. Ulema Manhattan College Computer Information Systems 9 - Copyright 2005 John Wiley & Sons, Inc Chapter 9 Metropolitan and Wide Area Networks 9 - Copyright 2005 John Wiley & Sons, Inc Outline Introduction Circuit Switched Networks Dedicated Circuit Networks Packet Switched Networks Virtual Private Networks Best practice MAN/WAN design Improving MAN and WAN Performance 9 - Copyright 2005 John Wiley & Sons, Inc Introduction Metropolitan area networks (MANs) Span from 3 to 30 miles and connect backbone networks (BNs) and LANs Wide area networks (WANs) Connect BNs and MANs across longer distances, often hundreds of miles or more Typically built by using leased circuits from common carriers such as AT&T Most organizations cannot afford to build their own MANs and WANs, 9 - Copyright 2005 John Wiley & Sons, Inc Introduction (Cont.) Focus of the Chapter | Business Data Communications and Networking 8th Edition Jerry Fitzgerald and Alan Dennis John Wiley & Sons, Inc Prof. M. Ulema Manhattan College Computer Information Systems 9 - Copyright 2005 John Wiley & Sons, Inc Chapter 9 Metropolitan and Wide Area Networks 9 - Copyright 2005 John Wiley & Sons, Inc Outline Introduction Circuit Switched Networks Dedicated Circuit Networks Packet Switched Networks Virtual Private Networks Best practice MAN/WAN design Improving MAN and WAN Performance 9 - Copyright 2005 John Wiley & Sons, Inc Introduction Metropolitan area networks (MANs) Span from 3 to 30 miles and connect backbone networks (BNs) and LANs Wide area networks (WANs) Connect BNs and MANs across longer distances, often hundreds of miles or more Typically built by using leased circuits from common carriers such as AT&T Most organizations cannot afford to build their own MANs and WANs, 9 - Copyright 2005 John Wiley & Sons, Inc Introduction (Cont.) Focus of the Chapter Examine MAN/WAN architectures and technologies from a network manager point of view Focus on services offered by common carriers (in North America), and how they can be used to build networks Regulation of services Federal Communications Commission (FCC) in the US Canadian Radio Television and Telecomm Commission (CRTC) in Canada Public Utilities Commission (PUC) in each state Common Carriers Local Exchange Carriers (Less) like Verizon, Bell South Interexchange Carriers (IXCs) like AT&T 9 - Copyright 2005 John Wiley & Sons, Inc Services Used by MANs/WANs Circuit Switched Network Services Dedicated Circuit Networks Services Packet Switched Networks Services Virtual Private Networks Services 9 - Copyright 2005 John Wiley & Sons, Inc Circuit Switched Services Oldest and simplest MAN/WAN approach Uses the Public Switched Telephone Network (PSTN) ., telephone networks Provided by common carriers like AT&T and Ameritech Basic types in use today: POTS (Plain Old Telephone Service)