Bandwidth graphic explanation - w/graphic

I have a very low volume site. The data center provides bandwidth stats through their switch/router.

Can anyone explain what the spikes might be in the attached graphic. It seems like there is an inbound spike followed by an outbound spike a few minutes later. Light blue is inbound, dark blue is outbound.

For reference I am using a fully patched W2k3 w/software firewall. A few of the inbound spikes are likely when I uploaded a 25MB file via FTP.

Thanks!

 

 

 

 

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