networking devices - university of california, san diego … · networking devices hubs, bridges,...
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Networking DevicesHubs, Bridges, Switches, Routers, Oh My!
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What makes a “computer network”?
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What if there are more that 2 computers?
More than two computers connected using a networking device.
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What if there are more that 2 computers?
“Networking Device” Hub / Bridge / Switch / Router
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Hub - Layer 1● “Dumb” - Forwarding decisions - Send incoming bits out all other
ports.● Number of ports - More than 2.● Single collision domain.
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Bridge - Layer 2● “Intelligent” - Decisions based on destination MAC address.● Store and Forward.● Number of ports - 2● Splits collision domain.
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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.
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Router - Layer 3● “Intelligence on a totally different level! Layer 3!”● Store and Forward.● Number of ports - More than 2.● Splits collision domain.
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Devices and Layers
LAYER 3(Network Layer) ROUTER
LAYER 2(Data Link Layer) SWITCH , BRIDGE
LAYER 1(Physical Layer) HUB
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Overview
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TCP/IP Protocol Stack
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Review of Spanning Tree Protocol
Why, What and How?
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“Loopy” network● Network Admins love loops. They call it “redundancy”. ● But, loops are bad.● Lets walk through an example
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Note : Project statusTest cases are up on the course site!
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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
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Thank You!Project due : Friday, next week.