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Chabot CollegeChabot College

ELEC 99.05ELEC 99.05Network Devices

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Network DevicesNetwork Devices

• Every type of network device was developed to solve a problem.

• Network devices operate at different layers of the OSI model.

• Are represented by Cisco icons.

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RepeaterRepeater

• Problem: On a long wire, signal gets weak.• Function: to strengthen signal & extend it to a

new media segment. • Layer 1 device - works with bits.

• Animation

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HubHub• Problem: workgroups need shared access to

printers, files, etc.• Function: to provide concentrated connections for

workgroups.• Hub is a multi-port repeater.• Layer 1 device - works with bits.

• Animation

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BridgeBridge

• Problem: too much traffic jams network.• Function: to segment traffic and contain

traffic jams.• Layer 2 device - works with MAC

addresses.

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SwitchSwitch• Problem: shared access often results in

traffic jams.• Function: to concentrate connections &

segment traffic.• Combines advantages of hub & bridge.• Switch is a multi-port bridge.• Layer 2 device - works with MAC

addresses.

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RouterRouter• Problem: How to find network path from

Hayward to New York.• Function: to direct traffic over multiple paths.

– Also:• to contain traffic jams• to connect different network topologies

• Layer 3 device - works with IP addresses.

• Animation

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Net Devices Solve ProblemsNet Devices Solve ProblemsDevice Function

Repeater

To strengthen signal & extend it to a newmedia segment.

Hub

To provide concentrated connections forworkgroups.

Bridge

To segment traffic & contain traffic jams.

Switch

To concentrate connections & segment traffic.

Router

To direct traffic over multiple paths.

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Devices Function at LayersDevices Function at Layers

D evice W o rks W ith

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QuizQuiz

• What’s this?• Repeater

• Which OSI Layer?• Layer 1

• Works with?• Bits - 10010101

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QuizQuiz

• What’s this?• Hub

• Which OSI Layer?• Layer 1

• Works with?• Bits - 10010101

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QuizQuiz

• What’s this?• Bridge

• Which OSI Layer?• Layer 2

• Works with?• MAC Addresses - 00-C0-F0-56-BD-71

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QuizQuiz

• What’s this?• Switch

• Which OSI Layer?• Layer 2

• Works with?• MAC Addresses - 00-C0-F0-56-BD-71

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QuizQuiz

• What’s this?• Router

• Which OSI Layer?• Layer 3

• Works with?• IP Addresses - 172.28.118.240