Koby,
I would be it is something to do with the speed of your NIC with the speed of your switch. You may have a Gb switch, but a single port may be connecting much slower. With your network speeds you may not notice a difference with 100Mbps, but at 10, you definitely will.
Of course, your unmanaged switch may fix it if there is a problem with your managed switch. But, with your managed switch, you will be able to see the port and what is going on with its status, link speed and duplex. As we talked about, your can force the link speed and duplex and you can change the Ethernet to your port. Ideally, your ports would be numbered to match numbers on your Ethernet jacks and the names would match your hardware.
