© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Presentation_ID 1

Chapter 1 A: Exploring the Network

Introduction to Networks

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Chapter 1: Objectives

After completing this chapter, students will be able to:

Explain how multiple networks are used in everyday life.

Explain the topologies and devices used in a small- to medium-sized business network.

Explain the basic characteristics of a network that supports communication in a small- to medium-sized business.

Explain trends in networking that will affect the use of networks in small to medium-sized businesses.

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Chapter 1

What is a Computer Network? A computer network is a telecommunications network which allows computers to exchange data.

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Computer Networking Impacts in Our Daily Lives

Networks support the way we

learn.

communicate.

work.

play.

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Chapter 1

Example of a Computer Network

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Chapter 1

Network Topology Network Topology is the arrangement of various elements in a computer network.

Each computer or device in the a network is called a node.

Cables connecting the nodes are known as links.

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Chapter 1

Network Topology

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Chapter 1

Types of Network Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Chapter 1

Topology

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Networks of Different Sizes

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Connected Devices

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Chapter 1

Types of Network • Peer-to-Peer Network • Client/Server Network • Local Area Network (LAN) • Wide Area Network (WAN) • Metropolitan Area Network (MAN) • Wireless LAN (WLAN) • Storage Area Network (SAN)

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Peer-to-Peer Network

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Client /Server Network A Client/Server Network is a system where standalone (client) PCs are connected to a Server (PC with Server OS)

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Clients and Server Network

In a client/server environment, each computer still holds resources and files. Other computers can access the resources stored in a computer, as in a peer-to-peer scenario.

Files and resources are centralized. The server has the resources and other computers can access them.

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Clients and Server Network

The server is always ON, the client machines can access the files and resources without caring whether a certain computer is ON.

Should the server be turned OFF, all resources will not be available. A standby server can be used for emergency.

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Clients and Server Network

Security is created, managed, and can highly get enforced. To access the network, a person, called a user must provide some credentials, such as a username and a password. If the credentials are not valid, the user is prevented from accessing the network.

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Components of a Network

There are three categories of network components:

Devices

Media

Services

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Components of a Network Example of devices Computers (work stations, laptops, file servers, web

servers)

Network printers

VoIP (Voice over Internet Protocol) phones

TelePresence endpoint

Security cameras

Mobile handheld devices (such as smart phones, tablets, PDAs, and wireless debit / credit card readers and barcode scanners)

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Components of a Network Network Infrastructure Devices

Examples of intermediary network devices are:

Network Access Devices (switches, and wireless access points)

Internetworking Devices (routers)

Security Devices (firewalls)

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Components of a Network Network Media

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Components of a Network Topology Diagrams

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END OF CHAPTER 1A

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REVIEW

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Chapter 1

1. What is a Computer Network?

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Chapter 1

1. What is a Computer Network? A computer network is a telecommunications network which allows computers to exchange data.

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Chapter 1

2. What is Network Topology .

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Chapter 1

2. What is Network Topology Network Topology is the arrangement of various elements in a computer network.

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Chapter 1

Each computer or device in the a network is called a _____.

Cables connecting the nodes are known as _____.

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Chapter 1

Each computer or device in the a network is called a node.

Cables connecting the nodes are known as links.

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Chapter 1

3. Names the topologies shown.

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Chapter 1

Types of Network Topology

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4. What network is this?

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4. What network is this? Peer-to-Peer Network

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What Network is this?

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5. What Network is this? Client-Server Network

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6. In a Peer-to-Peer Network, can one computer access the resources of the other computer?

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6. In a Peer-to-Peer Network, can one computer access the resources of the other computer? Yes

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7. In a Client Server Network, can one computer access the resources of the other computer?

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6. In a Peer-to-Peer Network, can one computer access the resources of the other computer? Yes

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7. In a Clients and Server Network, if one computer is not turned on, can the other computers access the server?

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7. In a Clients and Server Network, if one computer is not turned on, can the other computers access the server?

Yes

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8. In a Clients and Server Network, what must users have to access the server?

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8. In a Clients and Server Network, what must users have to access the server? Credentials – userid and password

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9. What are the three categories of network components? Devices

Media

Services

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10. Name some Components of a Network

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10. Name some Components of a Network Computers (work stations, laptops, file servers, web

servers)

Network printers

VoIP (Voice over Internet Protocol) phones

TelePresence endpoint

Security cameras

Mobile handheld

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11. Name some intermediary network devices.

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11. Name some intermediary network devices.

Network Access Devices (switches, and wireless access points)

Internetworking Devices (routers)

Security Devices (firewalls)

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12. What are the 3 types of media for transporting data?

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12. What are the 3 types of media for transporting data? • Copper • Fiber optic • wireless

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13. What are the 2 types of Network topology?

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13. What are the 2 types of Network topology? • Physical • logical

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Components of a Network Topology Diagrams

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How many questions did you answer

correctly?