Chapter 5 Internet and LAN Technology 英特网及局域网技术.ppt

Chapter 5: Internet and LAN Technology Chapter 5 Preview After this chapter, you should be able to: Describe the characteristics of various networks Diagram Shannon’s model of a communications network List types of cables List network devices Describe the role of communications protocols and list some protocols associated with the Internet and LANs Explain packet switching and circuit switching Recount the history of the Internet Chapter 5 Preview After this chapter, you should be able to: Draw a conceptual diagram illustrating the Internet backbone, NAPs, NSPs, routers, and ISPs Explain Ping and Traceroute Explain the differences between permanent IP addresses, dynamic IP addresses, private IP addresses, and domain names Describe the advantages and disadvantages of dial-up, cable modem, DSL, ISDN, T1, T2, and wireless Internet access Explain when and why it is important to implement security measures such as antivirus software, firewalls, and Network Address Translation Chapter 5 Outline Section A Network Building Blocks Section B Local Area Networks Section C Internet Technology Section D Internet Access Chapter 5Internet and LAN Technology英特网及局域网技术 Section A: Network Building Blocks 网络构架 Why is networking computers advantageous?计算机网络优势何在? Reduce costs Provides access to a wide range of services and specialized peripheral devices Sharing data on a network is easy Networks enable people to work together regardless of time and place Do networks have disadvantages?网络也有弱点吗? Primary disadvantage is their vulnerability to unauthorized access/非法访问/ More vulnerable/易受…的攻击/ than standalone computers to malicious /恶意的/code How are networks classified? Geographical scope Organizational structure Physical topology Network links Bandwidth Communications protocols Why is geographic scope important? Wide Area Network Metropolitan Area Network Local Area Network Neighborhood Area Network Personal Area Network What is the difference between a client/server network and a peer-