Living in a Network Centric World

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

http://www.catc.edu.cn/

2思科网络技术学院理事会 . http://www.catc.edu.cn Modified by Ye, Haisong. [email protected]

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.



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



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.



1.3.2 Examples of Today's Popular Communication Tools



1.3.3 Networks Supporting the Way We Learn



1.3.4 Networks Supporting the Way We Work



1.3.5 Networks Supporting the Way We Play



1.4 Communication - An Essential Part of Our Lives



1.4.1 What is Communication? (P.6)

Communication in our daily lives takes many forms and occurs in many environments.



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.



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.



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



1.5 The Network as a Platform



1.5.1 Communicating over Networks Being able to reliably communicate to anyone,

anywhere, is becoming increasingly important to our personal and business lives.



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.




Networking is a very graphically oriented subject, and icons are commonly used to represent networking devices.




For a network to function, the devices must be interconnected. Network connections can be wired or wireless.




Human beings often seek to send and receive a variety of message using computer applications; these applications require services be provided by the network.



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.



1.5.3 Converged Networks Intelligent Information Networks Planning for the Future



1.6 The Architecture of the Internet



1.6.1 The Network Architecture Fault Tolerance



1.6.1 The Network Architecture Scalability



1.6.1 The Network Architecture Quality of Service (QoS)



1.6.1 The Network Architecture Security



1.6.4 Providing Quality of Service Networks must provide secure, predictable,

measurable, and, at times, guaranteed services.



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.



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.



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



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



1.7 Trends in Networking



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



1.7.2 Networking Career Opportunities

Information Technology and networking careers are growing and evolving as fast as the underlying technologies and services.



Summary




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Living in a Network Centric World