Requesting penetration test resources

[David Withnall <dave () cheekysoftware com>]

I would be grateful if someone could provide some providers to resources 
where I might be able to learn the fundamentals of penetration testing 
for network security. I have researched a lot of web sites and found a 
couple of gems but it can be hard sorting out the wheat from the chaff 
sometimes, especially when you're a relative novice.

Thanks.
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