Essay on Exemptions

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Local Area Networks – The Basics
Chapter 7
Learning Objectives
After reading this chapter, you should be able to:
• • • • • • • •

State the definition of a local area network List the primary function, activities, and application areas of a local area network Cite the advantages and disadvantages of local area networks Identify the physical and logical local area networks Cite the characteristics of wireless local area networks and their medium access control protocols Specify the different medium access control techniques Recognize the different IEEE 802 frame formats Describe the common local area network systems

Chapter Outline
1. Introduction 2. Primary Function of Local Area Networks 3. Advantages and Disadvantages of Local
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We will then examine most of the common local area network products such as Ethernet and token ring.

Functions of a Local Area Network
The majority of users expect a local area network to perform the following functions and provide the following applications: file serving, database and application serving, print serving, electronic mail, remote links, video transfers, process control and monitoring, and distributed processing.

Advantages and Disadvantages of Local Area Networks
Local area networks have several advantages, including hardware and software sharing, workstation survival during network failure, component and system evolution, heterogeneous mix of hardware and software, and access to other LANs, WANs, and mainframe computers. Disadvantages include complexity, maintenance costs, and the fact that the network is only as strong as the weakest link.

The First Local Area Network – The Bus/Tree
The bus local area network was the first physical design when LANs became commercially available in the late 1970s, and it essentially consists of a single cable, or bus, to which all devices attach. Since then, the bus has diminished significantly to the point of near extinction. It is interesting to note that cable television signals are still delivered by a network bus. Thus, understanding the bus/tee network is still important.

Star-Wired Bus LANs
The most popular configuration for a local area network is the star-wired bus. This

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