Well, there could/should be, but what are you using? presumably kde 4.6/4.7/?, but are you using anything to manage the network (networkmanager/WiCD). If you are using an NM-type applet it will have its own little widget, and that will allow you to turn particular network connections on and off.
If you aren't using something NM-like, you can still have a monitoring widget, but you'll be stuck with turning things on and off by yourself, or a script, or whatever.
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