You are given a Computer, which is "somehow connected to the web". How do you find out how? [closed]

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http://serverfault.com – The way to accomplish this obviously depends on the operating system. Windows 7 Mac OS X Mountain Lion Ubuntu 12.4 Choose one of the above (preferably all 3), and explain how: You would find out how your computer connects to www.google.at. Include and list every piece of hardware (router, proxy ...) your packets "touch". (HowTos)