[TriLUG] marginally OT: Some bandwidth and DoS questions

[Matt Nash]

Hello all,

I am involved in evaluating a lawsuit brought against a web hosting 
provider by a former client, and some questions have arisen that I don't 
know the answer to.  I hope some of the networking gurus here can help 
me out:

Bandwidth
-For a DSL connection with 768 down and 384 up, if you are consuming all 
of the upstream bandwidth, does that mean you have no available 
downstream bandwidth?
-For a T-1 with a nominal speed of 1.5 Mbps, is 1.5 the total available 
bandwidth for upstream and downstream, with the entire pipe 
theoretically available for unidirectional traffic (i.e. 1.5 Mbps down, 
0 Mbps up)?

DoS
-Have you ever heard of anyone (ab)using wget to accomplish a deliberate 
non-distributed DoS attack?
-How much traffic/how many requests per second would be required to 
effectively DoS a 768/384 DSL connection? 
-Could this be done with wget? 
-Is there any resource on the internet which outlines how much data a 
computer with a given processor is capable of putting on a network 
interface?

wget
-Have you ever heard of anyone using wget to back up entire websites?
-Would using this method on a PHP-based website actually accomplish a 
backup?  It seems to me that it would only gather the generated HTML and 
Javascript.

Thanks for any help you might be able to provide.

Matt Nash