Title: Module 9 Introduction
Course: CNT 2001 Computer Networks & Communications > Section: Module 9 WAN Technologies

Introduction

There is an enormous difference between LANs and WANs (wide area networks). LANs are interconnected to each other through WANs. Unlike LANs (where Ethernet is dominant) there are many WAN technologies in use. We will explore the many technologies that interconnect WANs, including the switching technologies and the transmission medias.

Learning Objectives:

- Describe circuit switching.
- Explain how packet switching works and how it affects network operations in a practical situation.
- Compare circuit switching to packet switching.
- List different types of transmission media that are used in WANs.
- Explain how satellites are used in WAN communications.
- Explain how wireless WANs based on Radio Frequencies work.
- Explain how cells are used in wireless WANs.
- What dial-up is and how it works.
- Explain what DSL is.
- Explain how broadband and cable modems are used.
- Explain what X.25 is, Frame Relay, T-Carriers and ATM are
- About the new MPLS networking technology.
- Explain what a VPN is and how VPNs work.

Readings and Resources

Textbook: WAN Technologies (Lesson 8)