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  • #2074712

    Does a 10mbps nic effect speed of 100mbp

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    by jake4313 ·

    I recently attended a prep class for the A+ Certification Exam for hardware/operating systems. During a brief discussion on networks, the instructor indicated that a 10/100mbps network can be slowed down by a workstation with a 10mbps nic while others are using 100 nics. Is this true? If so, why?

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    • #3776227

      Does a 10mbps nic effect speed of 100mbp

      by fofa ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      I don’t have all the technical answers, but we have found this to be true in a limited way. It appears certain nic cards with certain version of rom’s can cause a performance problem on that segment. But this has turned out to be a minor number in our environment with >1000 PC’s.

    • #3776226

      Does a 10mbps nic effect speed of 100mbp

      by james schroer ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      There is a number of different things to look at but over all no matter what a 10mbps nic on any net work will slow it down to some point. First off if you are running everything at a 100mbps, wires, hubs, nics, etc and you throw a 10mbps nic in the middle the the fastest that the network can run is only 10mbps because of that nic. Now you can speed that back up by useing a switch instead of a hub on the network but it still will not be as fast as a 100% 100mbps network because the switch musttake time to “switch” between the speed. If you have anyother questions let me know.

      James

    • #3776205

      Does a 10mbps nic effect speed of 100mbp

      by vladanm ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      I am running a mixed 10/100 environment with 60+ computers and I haven’t noticed any slowdown as a result of using 10Mbit NIC-s and hubs. 100Mbit portion of my network performs just like it’s supposed to. For example, ghosting on 100Mbit runs at arround 200 megabytes/minute, while 10Mbit machines ghost at about 50. It certainly depends on the actual topology, quality of hubs/NIC-s, etc. A faulty NIC would choke your network regardles of it’s speed.

    • #3776182

      Does a 10mbps nic effect speed of 100mbp

      by avachon ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      okay Jake, here’s the short and simple. In amixed environment of 10/100, the lower will always take precedence so nics with the ability to run at 100mps will run at 10mps. Why? If that didn’t happen, the nics running at 10mps could not run if the network was running 100mps. Either the network runs at 10mps or 100mps. Now, one can subnet-create two networks- one running at 10, the other at 100. My bet is that your instructor is giving you a troubleshooting tip. If you notice a slowdown on your network, first check your physical connections such as nic speeds operating. Then, if problem is not resolved, you can look elsewhere such as broadcast storms is wins or lmhosts are not used, browser elections, etc. I’m sure your instructor told you to always look for problems at the physical layer first. Hope this helps.

    • #3776177

      Does a 10mbps nic effect speed of 100mbp

      by mckaytech ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      In a non-switched environment, it is true.

      When an Ethernet node has something to say, it first listens for other traffic and starts to send when the wire is quiet. It listens for a collision and if one occurs, both transmitting nodes stop and wait for an interval before trying again.

      A 10BaseT node will take longer to transmit a given packet and therefore other NICs on the segment will have a longer wait before they can send and this will slow down the network (although the effect will not be perceptible under most circumstances).

      In a switched full-duplex environment this is not true because each node can start sending without regards for what anyone else is doing since there are no collisions.

      regards!

      paul

    • #3776149

      Does a 10mbps nic effect speed of 100mbp

      by duster52 ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      A 10mbp NIC is not going to affect a 100mbp network. The 10mbp NIC will only connect to the network at 10mbps regardless of the speed of the rest of the network. It will only connect to the network if it is connected to a port that supports 10mbps. The network hardware should be able to able to handle the traffic flow. If the hardware (switch or hub) cannot handle the mixed speeds, then you may see some degradation, but the degradation will only indirectly be caused by the slower NIC.

      Wehave +2000 workstations, +50 servers, +400 printers all running at various speeds and duplexes. We do not see any degradation in speed or efficiency.

      So…my answer is a 10mbp NIC will not directly affect the overall speed of the network.

    • #3777804

      Does a 10mbps nic effect speed of 100mbp

      by dejan ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      first sory for bad english

      it’s not true because any 10 Mbps NIC not possible direct to connect to any 100 Mbps network. Any 10/100 hub must have one internal switch 10/100

    • #3777803

      Does a 10mbps nic effect speed of 100mbp

      by dejan ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      HKEY_CURRENT_USER/Network
      Recent
      Persistent

    • #3777790

      Does a 10mbps nic effect speed of 100mbp

      by saihib ·

      In reply to Does a 10mbps nic effect speed of 100mbp

      I both agree and respectfully disagree with the other answers. In a mixed 10/100 network a 10 mbps can only communicate at its highest rated speed. It doesn’t slow down the whole network, it only communicates at a slower rate. Two 100 mbps machines will still communicate at the faster rate. A switch or hub or NIC that is required to auto-sense the different speeds will, of course, introduce some latency. But those things operate in milliseconds and the change is imperceptible to mere humans like us.

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