DNS and SMTP

[kaps lock <secnerd2004 () yahoo com>]

Hi All,
I am a security new bie.I would like to know or
atleast if somebody can have me some pointers to good
turtorials on

1)DNS
basically i want to be able to understand everything
about DNS ,using nslookup,dig inorder to be a good
security analyst.like how i could determine OS of a
dns server ,or say how i could determine what evrsion
of BIND  it is using etc.
2)SMTP
If somebody could tell me what is an Object ID and how
does it function and how it is decided upon!!Like the
tree that is followed.Also could a system be
compromised if a attacker nows the communitry string?

thanks a bunch in advance

B



        
                
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