CAT-5 is no more sensitive to breaks than regular residential phone cable, that is, they are both sensitive and you shouldn't make a 90 degree turn with either one.
There is exterior rated CAT-5 if you ask for it.
Yes, your computer would need a network card for a DSL connection, but they cost as little as $35, and allow you to explore home networking, which is very cool.
Try the link above and see what you learn about ADSL.
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