utility

Traceroute reveals your Internet tracks

Traceroute tracks your Internet steps. Use it to show the path to the service you’re connecting to.

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How to check your Internet connection with Ping

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Is anybody there? Use Ping, like sonar, to check an Internet connection.

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Take Control ebooks (affiliate link) are superb.
I do some of my best learning from them. Buy through my link so I can make more and better Tips.

Take Control of Using Lion.  Buy Take Control of iCloud.  Macworld iPhone 4S Superguide  Take Control of iTunes 10: The FAQ, Second Edition