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Technology In Action Chapter 12

Computer Networks & Security

• Advantages of a network

• Client/server and peer-to-peer networks

• Classifications of client/server networks

• Client/server network components

• Types of servers

• Network topologies

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Technology In Action Chapter 12

Topics

• Types of transmission media

• Network software

• Network adapters

• Moving data in a client/server network

• Securing networks

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Technology In Action Chapter 12

Networking Advantages

• Networks:– Increase productivity– Enable the sharing of resources– Facilitate Internet connectivity

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Technology In Action Chapter 12

Client/Server Networks

• Server based network:– Clients– Servers

• Data flows efficiently

• Servers respond to requests from clients

• Servers perform specific tasks

• Scalable networkNEXT SLIDE

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Technology In Action Chapter 12

Classifications of Client/Server Networks• LAN:

– Local area network– Computers linked together over a small geographic

region

• WAN:– Wide area network– Computers linked together over large diverse

geographic locations

• MAN:– Metropolitan area network– Computers linked together within a city or county

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Technology In Action Chapter 12

Classifications of Client/Server Networks

• PAN:– Personal area network– Wireless devices connected in close proximity

to each other

• Intranet:– Private corporate network

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Technology In Action Chapter 12

Constructing Client/Server Networks

• Servers

• Network topologies

• Transmission media

• Network operating system (NOS)

• Network adapters

• Network navigation devices

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Technology In Action Chapter 12

Network Security• Authentication:

– User ID and password used to access the network

• Access privileges:– Enable access to certain network systems

• Physical protection measures:– Restrict physical access to sensitive network

equipment– Magnetic card readers– Biometric access devices

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Technology In Action Chapter 12

Network Security

• Firewalls:– Prevent access to the network by

unauthorized users– Composed of software and/or hardware– Screens and validates data packets– Bastion host/proxy server

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