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Asked: 2026-06-03T09:01:43+00:00

I wanted to confirm something and will appreciate your help. Suppose we have three

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I wanted to confirm something and will appreciate your help. Suppose we have three nodes called A,B and C. All are connected to a switch whose port supports 1 Gbps. Now suppose, Node’s A network card is 100 Mbps while the the remaining have a 1 Gbps. Following are the constraints;

1) A can send B only with a maximum of 100 Mbps. 2) A can send C only with a maximum of 80 Mbps.

Now if I were to broadcast a 2 GB file;

1) It would reach B with approx 2.73 minutes. 2) It would reach C with approx 3.41 minutes.

Now even if I replace node A’s network card with 1 Gbps with the same constraints, I would still get the same results. Have I got it right?

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  1. Editorial Team

    I’m assuming you’re using something like UDP broadcast.

    If you read / broadcast sequentially through a file, sustained broadcast traffic at a rate higher than C can process will loose some file components forever while going to C.

    In this case you are limited by the least common denominator. In the real world, C simply can’t buffer 20Mbps of traffic for minutes at a time.

    FYI, many people use 1024 bytes for a Kilobyte… using this assumption, the calculation in seconds is…

    >>> (2*1024*1024*1024*8)/(80*1000*1000.0)
214.74836479999999

    About 3.58 minutes

    Replacing A’s card with something faster than C’s capacity will not help speed the transfer.

    Also realize that the real world imposes encapsulation overhead (from Ethernet / IP / UDP headers), so you will never achieve line-rate data transfer rates, even between A and B. You haven’t told us what the protocols in question are, so that piece is still a question.

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