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what does "Repeaters and hubs propagate collision; LAN switches, bridges and routers do not. " mean....i dont' understand this phrase...can someone explain it better to me...thanks


~1~

2007-01-30 12:58:46 · 5 answers · asked by elbestionblog 1 in Computers & Internet Computer Networking

5 answers

Failures in repeaters, hubs, Lan switches, bridges and routers can cause data collisions. When I have seen them, it means failure within that node or hub. I have seen these caused by ethernet cards also, but that failure is often not propagated past the hub or switch that it is connected to.

Older hubs might have one port fail. When that port was used, it could cause data repetitions that would collide with other data. These failures would propagate through other ports within the hub, and even into other hubs.

Fortunately, many of these devices have a "collision LED", so you can easily identify which port has failed. Simply by unplugging the Ethernet patch cable, the collisions often stop dead.

Many hubs can't differentiate collisions with good data. Many newer switches can. I prefer using more modern high speed ethernet switches over hubs for reliability and maintainability. It is a good idea to use switches that are easily and quickly replaced.

Good luck and Happy Computing!

2007-01-30 13:10:20 · answer #1 · answered by Anonymous · 0 3

It means exactly what it says ... collisions, caused by two devices transmitting on the wire at the same time are propagated by repeaters and hubs ... in other words R & H just repeat and amplify the analog signal to different branches of the network. A switch or bridge segments the network into smaller branches so if two devices transmit at the same time the S & B mediates the collision by buffering the data until it is safe to transmit.

This is a little like voicemail .... bear with me a sec. If I am tlalking to you and I do not have voicemail if someone else calls, they get a busy signal ... collision, but if I have voicemail, the new callers data is buffered in my voicemail until I get off the phone with you and can listen to it. That is a bit like the game switches and bridges will play ... they are not just mechanically repeating what comes in one line to the others, they are managing the traffic more.

2007-01-30 21:11:15 · answer #2 · answered by themountainviewguy 4 · 0 0

Ethernet is like using a Walkie Talkie, anybody can yell at once. So it is a contention based network. Collisions of packets will occur from time to time. So the lan cards wait a random interval and resend to get their packets through.

Hubs and repeaters have no smarts and broadcast whatever they see to each and every port. Switches, bridges and routers can use intelligence (with the TCP/IP protocol) to route the packets towards their destination, instead of every port available. Makes it more streamlined.

2007-01-30 21:10:33 · answer #3 · answered by KirksWorld 5 · 0 1

If you don't know go back to school. They are computers haha. Wake up dippy and stop posting messages if you don't know the answer laimo.

2007-01-30 21:42:24 · answer #4 · answered by Apple 1 · 0 2

It means The Man is out to get you.

FIGHT THE MACHINE.

2007-01-30 21:05:56 · answer #5 · answered by clevernicknameohlawd 1 · 0 2

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