Question about Surfboard modem

I have cable and changed the OEM modem for a Surfboard. The question is, while I was doing a scan for viruses using Comodo security, I noticed that even after I disconnected I still had traffic. The Surfboard has an on/off function and so I turned it off and I still had two outgoing traffic, Sychost 80 to 100% and system for a bit. why do I still have traffic after turning the modem off?

 

It's the system trying to communicate with the modem.

 

The thing I was most curious about was it doing it when it's turned off. I thought that was like the same as powering it down.

 

The button on the top puts the surfboard into standby, meaning traffic in and out stops but it isn't powered down. The only way to stop the power is to pull the power plug from the wall or pull the power adapter off the back of the surfboard.

 

plodr.... What I meant by saying that turning the modem off was similar to unpluging the modem was that both stop internet traffic. Well, just pushing the button on top which does disconnect from the internet, or at least keep you from going to any web sites, doesn't seem to stop all traffic flow. That's what I was referring to. I'm still seeing traffic with the modem turned off or in standby as you say.