How to determine what is taking up all the network bandwidth?

How to determine what is taking up all the network bandwidth?

The past couple of weeks our internet service has been extremely slow.  How do i identify the cause of the problem.

Do I need to get some type of web monitoring tool?
cmleavittAsked:
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Jason MillsappsNetwork AdministratorCommented:
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mat1458Commented:
What type of network devices do you have? Can you access and configure them yourself?
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Khandakar Ashfaqur RahmanExpert/ConsultantCommented:
If you have managable switch you can enable SNMP into your switch.And configure MRTG/Cacti:
http://www.cacti.net/downloads/packages/Windows/Cacti-0.8.7i.exe
You could check graph and could find out which device is using high.

If you use Cisco device then you could configure Netflow Analyzer.Or if your switch supports port mirroring then you can use Protocol analyzer to check network packet.
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