© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1

Living in a Network Centric World

Network Fundamentals – Chapter 1

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Objectives

How networks impact daily life

Role of data networking in the human network

Key components of any data network

Opportunities and challenges of converged networks

Characteristics of network architectures: • fault tolerance

• scalability

• quality of service

• security

Installing and using IRC clients and a Wiki server

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How Networks Impact Daily Life

Benefits of instantaneous communication

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How Networks Impact Daily Life Characteristics and purpose of communication media

–Instant messaging

•Real time communication

between 2 or more

people based on typed text

–Weblogs (Blogs)

•Web pages created

by an individual

–Podcasting

•Website that contains

audio files available

for downloading

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How Networks Impact Daily Life

Information networks improve teaching and learning

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How Networks Impact Daily Life Networks change the way we work

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How Networks Impact Daily Life Networks support the way we play

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Networking: Role, Components, and Challenges

Characteristics of communication–Rules or agreements are 1st established

–Important information may need to be repeated

–Modes of communication are important

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Networking: Role, Components, and Challenges

Elements of a network–Devices

•Communicate with each other

–Medium

•Connects devices together

–Messages

•Information

–Rules

•How messages flow

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Networking: Role, Components, and Challenges

Converged networks in communicationsConverged network: A network that can carry

•voice

•video

•data

over the same network

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Network Architecture Characteristics

Four characteristics of network architecture design–Fault tolerance

–Scalability

–Quality of service

–Security

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Network Architecture Characteristics Packet switching

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Network Architecture Characteristics Characteristics of the Internet

–Hierarchical

–Common standards

–Common protocols

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Network Architecture Characteristics Quality of Service

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Network Architecture Characteristics QoS mechanisms

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Network Architecture Characteristics QoS strategies

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Network Architecture Characteristics Networks must be secure

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Network Architecture Characteristics Measures to secure data networks

–Ensure confidentiality through

•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

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IRC Clients and Wiki Server

Install and use IRC clients and a Wiki server

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Summary

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