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    <title><![CDATA[Discussion on The 10 most common causes of network slowdowns ]]></title>
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    <language>en-us</language>
    <lastBuildDate>2013-05-22T06:02:36-07:00</lastBuildDate>
             

    <item>
        <title><![CDATA[Duplicate MACs]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-3389775]]></link>
        <description><![CDATA[I kid you not.Friend of mine was the IT guy for a polytechnic in the early 90's and found that two PCs wouldn't run at the same time. Turned out that the Taiwanese NIC maker had been creating duplicate MACs and the training institute was unlucky enough to end up with two of these cards on their LAN]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-3389775]]></guid>
        <dc:creator><![CDATA[mansonc]]></dc:creator>
        <pubDate>Wed, 24 Nov 2010 01:05:41 -0800</pubDate>
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    <item>
        <title><![CDATA[Always helps to supply the rationale...]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2535358]]></link>
        <description><![CDATA[For those of us with more experience, your statement is perfect. But what about all the other people.A 8-port 100 mbs Hub divides that 100 mb between ALL ports, whereas a switch supplies 100 mb to EACH port, thus many times faster, etc....]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2535358]]></guid>
        <dc:creator><![CDATA[itstaff@...]]></dc:creator>
        <pubDate>Sun, 29 Jun 2008 21:19:20 -0700</pubDate>
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    <item>
        <title><![CDATA[Get a grip Bob]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2337308]]></link>
        <description><![CDATA[Feckin architects. Bunch of a$$holes the world over. &quot;egregious&quot; what kind of feckin moran uses that word. Fu(k off and die bob !]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2337308]]></guid>
        <dc:creator><![CDATA[mchughe@...]]></dc:creator>
        <pubDate>Fri, 12 Oct 2007 07:51:03 -0700</pubDate>
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        <title><![CDATA[Duplex mismatch is the most common cause in our experience]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2328014]]></link>
        <description><![CDATA[pgm554 is totally correct that Number one cause of slowdown on networks is duplex mismatch.However, I don't share his Anti-Windows views.Jay]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2328014]]></guid>
        <dc:creator><![CDATA[jaykulsh@...]]></dc:creator>
        <pubDate>Fri, 28 Sep 2007 01:50:22 -0700</pubDate>
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    <item>
        <title><![CDATA[What are Loop Backs?]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2319950]]></link>
        <description><![CDATA[Thanks]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2319950]]></guid>
        <dc:creator><![CDATA[brianbrian]]></dc:creator>
        <pubDate>Fri, 14 Sep 2007 11:25:20 -0700</pubDate>
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    <item>
        <title><![CDATA[not enough licenses]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2176970]]></link>
        <description><![CDATA[I have seen where having more pc's attached than available licenses will slow them down to a crawl. I am going through this right now. As soon as I plug the nic cable in the pc, wham, it begings to crawl. Take it out and the pc flies.I have tried replacing the nic, adding the cable later, and switching ports but it does the same thing. I took the machine out and plugged it into another network and it came right up. I have not put a sniffer on to see what actually happens but it takes the system down to a crawl and causes software to malfunction]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2176970]]></guid>
        <dc:creator><![CDATA[mike@...]]></dc:creator>
        <pubDate>Wed, 21 Feb 2007 01:09:12 -0800</pubDate>
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    <item>
        <title><![CDATA[Extension of #2]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2174280]]></link>
        <description><![CDATA[Out of date firmware on switches can cause bizare issues. Add updating your switches / routers firmware (software / OS) to your yearly &quot;To-Do&quot; list!]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2174280]]></guid>
        <dc:creator><![CDATA[dmarston]]></dc:creator>
        <pubDate>Fri, 16 Feb 2007 11:32:43 -0800</pubDate>
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    <item>
        <title><![CDATA[Thanks!]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2174267]]></link>
        <description><![CDATA[Helped me out.  Best,]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2174267]]></guid>
        <dc:creator><![CDATA[matt@...]]></dc:creator>
        <pubDate>Fri, 16 Feb 2007 11:22:38 -0800</pubDate>
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        <title><![CDATA[That's 1 connection per machine]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2173843]]></link>
        <description><![CDATA[If you got a virtual machine inside, it counts as a second PC.It is possible to use 2 Ethernet ports if without EtherChannel if you're connected to two subnets and you want to manually input a bunch of routes and turn your PC in to a complex router.  That lets you talk to different destinations at the same time but it's a nightmare to manage.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2173843]]></guid>
        <dc:creator><![CDATA[georgeou]]></dc:creator>
        <pubDate>Fri, 16 Feb 2007 01:52:54 -0800</pubDate>
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    <item>
        <title><![CDATA[It is possible]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2173166]]></link>
        <description><![CDATA[if you use a Virtual Machine within the Physical Machine!]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2173166]]></guid>
        <dc:creator><![CDATA[NOW LEFT TR]]></dc:creator>
        <pubDate>Thu, 15 Feb 2007 05:33:35 -0800</pubDate>
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    <item>
        <title><![CDATA[Agee to disagree]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171376]]></link>
        <description><![CDATA[Number one slowdown on networks is duplex mismatch.This is not even mentioned.If you are talking small networks,adding(cascading)switches causes very little, if any propgation delay.So I don't quite get that one.Screwing up a subnet mask is also another gotcha.Cheap switches can also cause issues if they can'y auto negotiate correctly.DNS servers?What is this,a windows only seminar?Their are other,better methods for nework discovery(SLP being one).Netbios broadcasts and WINS suck,but if you are running M$ based garbage,you get what you deserve.Top 10,maybe a couple of obvious ones,but there are loads of others depending upon the size of the network.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171376]]></guid>
        <dc:creator><![CDATA[pgm554]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 15:19:26 -0800</pubDate>
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    <item>
        <title><![CDATA[You can't use both at the same time]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171301]]></link>
        <description><![CDATA[You can't use both at the same time.  It's possible to have both interfaces on and connected, but the system will default to route traffic from one or the other and usually will/should prefer the wired interface.  You need EtherChannel drivers on similar card types to do channel bonding and link aggregation.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171301]]></guid>
        <dc:creator><![CDATA[georgeou]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 14:13:29 -0800</pubDate>
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    <item>
        <title><![CDATA[Actually]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171296]]></link>
        <description><![CDATA[&quot;doctored&quot; can be appropriate.  Those papers were doctored.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171296]]></guid>
        <dc:creator><![CDATA[Cactus Pete]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 13:59:22 -0800</pubDate>
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    <item>
        <title><![CDATA[Problem with Wired/Wireless at same time?]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171228]]></link>
        <description><![CDATA[How bad is it to use both wireless and wired at the same time?  Its what our boss does because he doesn't want to have to remember to shut one or the other off.  We're just a 20 person workgroup network, but I've always been curious:  how can I go about and see if a user having two ips (one for wireless, one for wired) will affect their performance/bandwidth?]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2171228]]></guid>
        <dc:creator><![CDATA[matt@...]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 11:47:23 -0800</pubDate>
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    <item>
        <title><![CDATA[Combinations of All of The Above]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2170949]]></link>
        <description><![CDATA[I have found that it is pretty straight-forward to identify any of the 10 items listed as the culprit when the problem is isolated to just one of the 10 causes.  However, when it gets really fun is when it is a combination of more than 1 of the ten and some moron is trying to figure it out.I recently had a twist on 1, 2, and 3 where the client used a big name firm from the other side of the state to install $25 daisy-chained switches throughout their production work area onto a combined Win-Linux network.  The customer's cue-to-call in for help was it was taking 15 minutes for color print jobs to reach the printer's output tray.  The customer had their big-firm, non certificated specialists come in-2 hours of drive time each way-in tandem because one &quot;specialist&quot; was obviously not enough horsepower to troubleshoot the problem.  They came and scratched their heads on Friday and again all day Saturday (weekend rates!)  They also hauled the printer's manufacturer technician/specialist at $200/hr, min. 2 hours, in on the weekend to troubleshoot his &quot;broken equipment&quot; only for all to leave without resolution except finger pointing to each other.  I happened to be on the site Monday morning when the owner of the business said &quot;you know how to troubleshoot these issues.  We have already spent well over a thousand dollars and still no resolution and we still can't print in color!&quot;  He asked me to clear my evening schedule because he expected a full network rebuild and wanted me to do it rather than his IT Department's outside firm.  I said, why not take a quick look at it now.  I went to the daisy chained switch and noted that it had a bank of green lights and one orange one (a Clue!)  I traced the orange one to a mis-configured, half duplex PC NIC, reset it, the light turned green and I said &quot;have your people try to print now.&quot;   The big-named firm sent back a kid (4 more hours of drive time) to confirm that the staff could really print, but when I bumped into him he said &quot;You got lucky pal, but I still think the NIC on the printer is bad and so does everyone in my firm!&quot;  That was three weeks ago and the firm from the other side of the state is still blaming the printers manufacturer.  The funny thing is everyone can print in color and the problem hasn't resurfaced, but they have a Full Network Rebuild on their to-do list.Although that firm's ego is still preventing them from admitting that they really missed some obvious clues, their lessons should be:Consider the big picture, look for the warning lights-they generally mean something, use quality enterprise hardware, don't assume that it is automatically someone else's fault, and be willing to admit when you are wrong.  Oh, and try to have fun in your work.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2170949]]></guid>
        <dc:creator><![CDATA[ideallypc]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 06:10:02 -0800</pubDate>
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    <item>
        <title><![CDATA[Replace any hubs]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2170854]]></link>
        <description><![CDATA[It's amazing the amount of places I see that still use hubs. And sometimes the network guy doesn't know the difference between a hub and a switch.Bin those hubs and replace with switches.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2170854]]></guid>
        <dc:creator><![CDATA[Andy The IT Bloke]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 03:19:49 -0800</pubDate>
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    <item>
        <title><![CDATA[It really depends on]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2170819]]></link>
        <description><![CDATA[the word. Let's take an exapmple of Engineer, thus: The machine is well engineered. Sounds okay; what about doctor? You say &quot;the patient is well doctored&quot;?]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2170819]]></guid>
        <dc:creator><![CDATA[rapell]]></dc:creator>
        <pubDate>Mon, 12 Feb 2007 01:38:31 -0800</pubDate>
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    <item>
        <title><![CDATA[sweet ... but ...]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2169959]]></link>
        <description><![CDATA[Does this command work on all Cisco Switches?I have some older 2900XL/3500XL series stuff!]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2169959]]></guid>
        <dc:creator><![CDATA[malone@...]]></dc:creator>
        <pubDate>Fri, 09 Feb 2007 16:26:47 -0800</pubDate>
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        <title><![CDATA[As found on Dictionary.com]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2169866]]></link>
        <description><![CDATA[-VERBTo plan, organize, or structure as an architect: The house is well architected.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2169866]]></guid>
        <dc:creator><![CDATA[zach@...]]></dc:creator>
        <pubDate>Fri, 09 Feb 2007 14:44:47 -0800</pubDate>
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    <item>
        <title><![CDATA[Good points, but what is a well-architected network?]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2169817]]></link>
        <description><![CDATA[Architect is a noun, a person who designs, typically buildings and landscapes. You cannot really architect something. You design something. Perhaps you meant a well designed network? As a Florida registered Architect, I find the improper use of the word architect by many IT types, as strange at best. The IT industry is full of extremely intelligent people and to misuse a word like this is egregious.]]></description>
        <guid><![CDATA[http://www.techrepublic.com/forum/discussions/102-210894-2169817]]></guid>
        <dc:creator><![CDATA[PineappleBob]]></dc:creator>
        <pubDate>Fri, 09 Feb 2007 13:17:39 -0800</pubDate>
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