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Understanding Network Devices: Functions, Layers, and Problems Solved

This resource covers various types of network devices, each designed to address specific networking challenges. Network devices operate at different layers of the OSI model and are represented by Cisco icons. Key devices include repeaters that strengthen signals (Layer 1), hubs providing shared access (Layer 1), bridges segmenting traffic (Layer 2), switches combining hub and bridge capabilities (Layer 2), and routers directing traffic across networks (Layer 3). Each device plays a vital role in managing and optimizing network performance.

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Understanding Network Devices: Functions, Layers, and Problems Solved

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  1. Chabot College ELEC 99.05 Network Devices

  2. Network 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.

  3. Repeater • 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

  4. Hub • 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

  5. Bridge • Problem: too much traffic jams network. • Function: to segment traffic and contain traffic jams. • Layer 2 device - works with MAC addresses.

  6. Switch • 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.

  7. Router • 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

  8. Net Devices Solve Problems

  9. Devices Function at Layers

  10. Quiz • What’s this? • Repeater • Which OSI Layer? • Layer 1 • Works with? • Bits - 10010101

  11. Quiz • What’s this? • Hub • Which OSI Layer? • Layer 1 • Works with? • Bits - 10010101

  12. Quiz • What’s this? • Bridge • Which OSI Layer? • Layer 2 • Works with? • MAC Addresses - 00-C0-F0-56-BD-71

  13. Quiz • What’s this? • Switch • Which OSI Layer? • Layer 2 • Works with? • MAC Addresses - 00-C0-F0-56-BD-71

  14. Quiz • What’s this? • Router • Which OSI Layer? • Layer 3 • Works with? • IP Addresses - 172.28.118.240

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