A primer on network devices
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This document discusses different networking devices and their functions. Hubs operate at the physical layer and forward all incoming bits to other ports, creating a single collision domain. Bridges and switches operate at the data link layer and make forwarding decisions based on MAC addresses, splitting collision domains into multiple segments. Routers operate at the network layer and make forwarding decisions based on IP addresses, splitting collision domains. The document also briefly mentions TCP/IP protocol stack, spanning tree protocol, and references for further reading.
A primer on network devices
- 1. Networking Devices Hubs, Bridges, Switches, Routers, Oh My!
- 2. What makes a “computer network”?
- 3. What if there are more that 2 computers? More than two computers connected using a networking device.
- 4. What if there are more that 2 computers? “Networking Device” Hub / Bridge / Switch / Router
- 5. Hub - Layer 1 ● “Dumb” - Forwarding decisions - Send incoming bits out all other ports. ● Number of ports - More than 2. ● Single collision domain.
- 6. Bridge - Layer 2 ● “Intelligent” - Decisions based on destination MAC address. ● Store and Forward. ● Number of ports - 2 ● Splits collision domain.
- 7. Switch - Layer 2 ● “More Intelligent” - Multiport bridge. Decisions based on destination MAC address. ● Store and Forward. ● Number of ports - More than 2. ● Splits collision domain.
- 8. Router - Layer 3 ● “Intelligence on a totally different level! Layer 3!” ● Store and Forward. ● Number of ports - More than 2. ● Splits collision domain.
- 9. Devices and Layers LAYER 3 (Network Layer) ROUTER LAYER 2 (Data Link Layer) SWITCH , BRIDGE LAYER 1 (Physical Layer) HUB
- 10. Overview
- 12. Review of Spanning Tree Protocol Why, What and How?
- 13. “Loopy” network ● Network Admins love loops. They call it “redundancy”. ● But, loops are bad. ● Lets walk through an example
- 14. Note : Project status Test cases are up on the course site!
- 15. References ● Bridging and Switching - http://cseweb.ucsd.edu/classes/fa13/cse123- a/lectures/123-fa13-l9.pdf ● http://www.routeralley.com/ra/docs/hubs_switches_routers.pdf ● Internetworking - http://cseweb.ucsd.edu/classes/fa13/cse123- a/lectures/123-fa13-l10.pdf
- 16. Thank You! Project due : Friday, next week.