![]() Figure it out.” At this point if he wants to speak to Sally he doesn’t even know if Sally is in the same room as him.or in a different room. ![]() People you want to communicate with may-or-may-not be in the same room as you. Or what if Bob is blind? He is told, “you are in Room-1 and there are other rooms in this building. Bob can’t simply “speak” and expect that Sally will be able to hear him. a router).Īn example of this would be if Bob is in Room-1 on the first floor of a building, and Sally is in room-x on the 20th story of that same building. I need to talk to you.” All others in the room will hear Bob’s voice, but elect to ignore it once they understand that he is trying to communicate with Sally.īut that entire premise breaks down if you have devices which cannot hear each other directly and instead, need some kind of relay agent to communicate (i.e. This is similar to the question, “ if a bunch of people are in the same room and can all hear each other talking, how can one person communicate directly with another?” As a solution, we can provide each person with a unique name (such as Bob and Sally) and therefore Bob, when he decides to speak, can simply shout out “Hey Sally, this is Bob. This address would not prevent everyone else on the cable from seeing the data, but it would provide an indicator as to which specific device was the intended recipient of that data. cable) in which all devices can physically "hear" all other devices (this is how Ethernet works) the designers determined that each device simply needed a unique identifier (MAC Address) with which they could address their data.
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