There are all kinds of places to get started learning about networking. Since you're starting from the bottom, I suggest a couple of resources as good general tools about IT and computing topics, as well as about networking:
1. www.whatis.com: here, you'll find definitions on most technical topics, with pointers to additional information.
2. www.techfest.com: this is probably the best source for networking tutorials per se, but also includes great coverage of general tech topics.
3. www.techweb.com/encyclopedia/: another good general source of technical information, but rather more brief and less tutorial in nature
Also, visit your favorite test engine and search on the string "networking tutorial."
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