1. 思科网络技术学院理事会. http://www.catc.edu.cn 1 Living in a Network Centric World Network Fundamentals – Chapter 1

2. 2 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com Objectives  Describe how networks impact our daily lives.  Describe the role of data networking in the human network.  Identify the key components of any data network.  Identify the opportunities and challenges posed by converged networks.  Describe the characteristics of network architectures: fault tolerance, scalability, quality of service and security.  Install and use IRC clients and a Wiki server.

3. 3 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com Context Index  1.3 Communicating in a Network-Centric World  1.4 Communication - An Essential Part of Our Lives  1.5 The Network as a Platform  1.6 The Architecture of the Internet  1.7 Trends in Networking

4. 4 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.3.1 Networks Supporting the Way We Live  Among all of the essentials for human existence, the need to interact with others ranks just below our need to sustain life.

5. 5 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.3.2 Examples of Today's Popular Communication Tools

6. 6 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.3.3 Networks Supporting the Way We Learn

7. 7 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.3.4 Networks Supporting the Way We Work

8. 8 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.3.5 Networks Supporting the Way We Play

9. 思科网络技术学院理事会. http://www.catc.edu.cn 9 1.4 Communication - An Essential Part of Our Lives

10. 10 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.4.1 What is Communication? (P.6)  Communication in our daily lives takes many forms and occurs in many environments.

11. 11 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.4.2 Quality of Communications (P.6)  Communication between individuals is determined to be successful when the meaning of the message understood by the recipient matches the meaning intended by the sender.

12. 12 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.4.2 Quality of Communications  Information that has to be recoded and decoded a number of times may not be transmitted successfully.  Messages that have to be readdressed and redirected a number of times may not be delivered successfully.

13. 13 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.4.2 Quality of Communications  Internal factors affecting the successful communication across the network include: The size of the message The complexity of the message The importance of the message

14. 思科网络技术学院理事会. http://www.catc.edu.cn 14 1.5 The Network as a Platform

15. 15 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.1 Communicating over Networks  Being able to reliably communicate to anyone, anywhere, is becoming increasingly important to our personal and business lives.

16. 16 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.2 The Elements of a Network  The diagram shows elements of a typical network, including devices, media, and services, tied together by rules, that work together to send messages.

17. 17 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.2 The Elements of a Network  Networking is a very graphically oriented subject, and icons are commonly used to represent networking devices.

18. 18 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.2 The Elements of a Network  For a network to function, the devices must be interconnected. Network connections can be wired or wireless.

19. 19 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.2 The Elements of a Network  Human beings often seek to send and receive a variety of message using computer applications; these applications require services be provided by the network.

20. 20 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.3 Converged Networks  Converged networks Technology advances are enabling us to consolidate these disparate networks onto one platform - a platform defined as a converged network.

21. 21 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.5.3 Converged Networks  Intelligent Information Networks  Planning for the Future

22. 思科网络技术学院理事会. http://www.catc.edu.cn 22 1.6 The Architecture of the Internet

23. 23 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.1 The Network Architecture  Fault Tolerance

24. 24 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.1 The Network Architecture  Scalability

25. 25 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.1 The Network Architecture  Quality of Service (QoS)

26. 26 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.1 The Network Architecture  Security

27. 27 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.4 Providing Quality of Service  Networks must provide secure, predictable, measurable, and, at times, guaranteed services.

28. 28 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.4 Providing Quality of Service  Queuing according to data type enables voice data to have priority over transaction data, which has priority over web data.

29. 29 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.4 Providing Quality of Service  QoS mechanisms enable the establishment of queue management strategies that enforce priorities for different classifications of application data.

30. 30 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.5 Providing Network Security  Security measures taken in a network should: –Prevent unauthorized disclosure or theft of information –Prevent unauthorized modification of information –Prevent Denial of Service  Means to achieve these goals include: –Ensuring confidentiality –Maintaining communication integrity –Ensuring availability

31. 31 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.6.5 Providing Network Security  Basic measures to secure data networks –Ensure confidentiality through use of User authentication Data encryption –Maintain communication integrity through use of Digital signatures –Ensure availability through use of Firewalls Redundant network architecture Hardware without a single point of failure

32. 思科网络技术学院理事会. http://www.catc.edu.cn 32 1.7 Trends in Networking

33. 33 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.7.1 Where Is It All Going?  There are three major trends that are contributing to the future shape of complex information networks: –Increasing number of mobile users –Proliferation of network capable devices –Expanding range of services

34. 34 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com 1.7.2 Networking Career Opportunities  Information Technology and networking careers are growing and evolving as fast as the underlying technologies and services.

35. 35 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com Summary

36. 36 思科网络技术学院理事会. http://www.catc.edu.cn Modified by Ye, Haisong. yhs.shnu@gmail.com