Is there any idea,how it s possible to count congestions happened in a node as part of Network?
closed as not a real question by Paul, slhck♦, KronoS, 8088, Joe Taylor Jul 24 '12 at 8:16
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I'm not a network hardware guy, but I believe they may be able (on some devices) measure things like how full a buffer is (in bound or out bound), how many packets are in a queue waiting to be transmitted, or number of packet dropped because the buffer is full. Switches/routers that have these features built in probably have other metrics like packet counts or even bandwidth usage that would give you a clear picture how traffic is flowing.
These features are usually on SOHO or larger devices. However, I've seen some nice managed switches for about $300, so they aren't too expensive.
I'm sure someone with their CISCO certification could explain things better than I did.