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

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

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