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This introductory chapter started by considering the definition of a network. Next, different types of networks were briefly discussed and then some reasons why networks are used were given. Finally, computer communication and some of the basic terms used were introduced.

This chapter began with a description of the ISO network management model, which divides network management into configuration management, fault management, performance management, accounting management and security management. Some hardware and software tools that are used for network management were then discussed. Next, some ways of troubleshooting networks were mentioned. SNMP (a TCP/IP Application Layer protocol that makes it easy for management information to be exchanged between network devices) was then described, along with its equally important variant RMON. In the next section, the value of good network documentation was stressed. The chapter finished with a short section on LAN server administration.

This chapter has looked at networking models and standards. The chapter started with an explanation of network layering. The OSI 7-layer model, an important way of describing networks, was examined. The principles of data encapsulation were then explained. Another important networking model, TCP/IP, was then described. The OSI and TCP/IP models were then briefly compared. The importance of networking standards was highlighted. Finally, several important networking standards bodies were mentioned.

This chapter has looked at various aspects of LANs. The chapter started with an account of some of the factors that need to be considered when planning a LAN. Factors affecting the choices between peer-to-peer and client-server LANs and between wired and wireless networks were then considered. Various components and devices for both wired LANs and WLANs were also described. Ethernet, being by far the most important LAN technology, was covered at some length. Then, some other wired LAN technologies were described. The chapter finished with a brief sketch of SANs.

This chapter began with a description of the ISO network management model, which divides network management into configuration management, fault management, performance management, accounting management and security management. Some hardware and software tools that are used for network management were then discussed. Next, some ways of troubleshooting networks were mentioned. SNMP (a TCP/IP Application Layer protocol that makes it easy for management information to be exchanged between network devices) was then described, along with its equally important variant RMON. In the next section, the value of good network documentation was stressed. The chapter finished with a short section on LAN server administration.

This chapter has looked at networking models and standards. The chapter started with an explanation of network layering. The OSI 7-layer model, an important way of describing networks, was examined. The principles of data encapsulation were then explained. Another important networking model, TCP/IP, was then described. The OSI and TCP/IP models were then briefly compared. The importance of networking standards was highlighted. Finally, several important networking standards bodies were mentioned.

This chapter has looked at the Application Layer of TCP/IP-based networks. The chapter started with an explanation of client-server technology, which underlies most Internet activities. The following applications were examined in turn: the DNS, the World Wide Web, Remote Access, File Transfer, E-mail, the delivery of streamed content over the Internet and VoIP. The main protocols for each of these applications were discussed. The chapter ended with brief descriptions of P2P file sharing and instant messaging.

This chapter has looked at various aspects of network security, which is an extremely important issue in today’s networks. The chapter started with an explanation of several important security concepts and gave some security techniques related to these concepts. Further, the following aspects of network security were covered: VPNs; firewalls; intrusion detection and intrusion prevention systems; various kinds of attacks that may be made on networks; viruses, worms and Trojan horses; rootkits; spam e-mail; spyware; physical security and security of wireless networks.

This chapter began with a description of the ISO network management model, which divides network management into configuration management, fault management, performance management, accounting management and security management. Some hardware and software tools that are used for network management were then discussed. Next, some ways of troubleshooting networks were mentioned. SNMP (a TCP/IP Application Layer protocol that makes it easy for management information to be exchanged between network devices) was then described, along with its equally important variant RMON. In the next section, the value of good network documentation was stressed. The chapter finished with a short section on LAN server administration.

This chapter started with a mention of some technical aspects of transmission. We investigated various kinds of wireless networks, both fixed and mobile. We saw how PANs can be set up, using such technologies as Bluetooth or WUSB. We looked at ZigBee, a HAN technology. We explored some aspects of WLANs that were not covered in Chapter 4. Various types of cellular radio networks for mobile phones were described. We found that satellite networks, WiMAX and IEEE 802.20 are all technologies that can replace the wired analogue local loop, although this is not the only possible use for these. The chapter finished with a short discussion of RFID.