week 9 - Week9Econ 22:03 Aloha PrecursortoEthernet (ACKs)...

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Week 9 Econ  22:03 Aloha Precursor to Ethernet “Star” topology with base station at the center Base station receives all packets on frequency f,  Each computer acknowledges (ACKs) each correctly received packet Packets not ACK’d within timeout are retransmitted at future random Shared Ethernet MAC Smarter than ALOHA o Carrier Sensing (CS): start to transmit only if you don’t hear anyone else  talking o Collision Detection (CD) stop transmitting if you hear something Switched Ethernet Same as shared Ethernet but switch is smarter than hub Switch can receive packets from multiple lines at the same time (no collisions) Switch determines where the packet should go, and only sends it on that line Switch can also transmit packets on multiple (different lines) at the  In order to route packets, switch needs to know where they are going MAC Addresses:
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This note was uploaded on 04/20/2011 for the course ECON 11 taught by Professor Abob during the Spring '11 term at UC Irvine.

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week 9 - Week9Econ 22:03 Aloha PrecursortoEthernet (ACKs)...

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