【Memoirs】 Week#9 Nov 7th

Lecture

Networks 
roundly connected
(ring topology)

Way that messages passed between machines on this network

Each machine as a designated receiver for its messages, and designated sender of messages to it, and they are thus connected in a ring. A bit pattern, called a token, is passed from machine to machine, and a machine wishing to send a message to another machine retains the token, sends the message with the address of recipient machine, and waits until the message it is sending travels around the entire ring and it can confirm that is was sent. Then the token passed to the next machine.

centrally connected

(staar configuratution)

all connected 

(bus configuration)

eg. ethernet

Way that messages passed machines on this network

Each machine listens for messages addressed to it. when a machine needs to communicate with another machine on the same ethernet bus, is broadcasts a message with other machine's adress. If a machine detects a collision ( another machine trying to broadcast at the same time0 it stops broadcast for random time interval and re-broadcast.