1. Repeaters, Hubs, Bridges, Switches, Routers & Gateways Created by: David Elwell Dorian Glassberg Alley Hennigan

2. Classified as “unintelligent” devices. Two of the simplest networking devices. Repeaters and Hubs

3. Inexpensive. Best used in a bus topology. Being phased out in modern networks. Repeaters

4. A repeater with more than one output port. Have an uplink port, that allows the hub to connect to another hub or another connectivity device. Hubs

5. Hubs do not separate collision domains

6. Operate at OSI layer 2* “Intelligent” devices Bridges and Switches

7. Divides a network into 2 No valid address, no data across the bridge Bridges

9. Same as Bridges, but usually have multiple ports Switches

10. Isolate data flow Improve performance

11. Multilayer Switch Layer 3 (Network) Switching Router = Microprocessor Multilayer Switch = Circuit Hardware

12. Bridges and Switches

13. Key devices for communication between networks Routers and Gateways

14. Gateways “Protocol converters” A network node used to interface between different networks Acts as an entrance to another network Routers are a special type of gateway

15. Routers Forwards data packets across computer networks Works almost exclusively at the third layer History: – Idea: 1972 by INWG – First model: 1981 through DARPA initiative Tiers: – Access – Distribution – Security – Core

16. Routers