networking and exchange server

Dear experts ,
 kindly clear me some question answers:-
1) what are prerequisite of exchange server ?
2)what is bandwidth and how we calculate bandwidth in units ?
3)what is layer 2 and layer 3 in networking ?
4) methods of VPN ACESS ?
5) what is NAT ?
 kindly clear me the answers plz
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rsivanandanConnect With a Mentor Commented:
That confirms that it is homework question, no offence but if you were to just google using the same terms above you'd get ton loads of answers.

This looks like homework, and we aren't allowed to assist in homework on this site. Read the EE Guidelines which you had to agree to when you joined. I'm sure if you use google you will find your answers yourself.
sanjeevkmrsAuthor Commented:
for your kind information its not a home work sir ?
                                  as i am going through interviews these ays so these questions were putup there , for which i dint ahd appropriate answer thats why i am asking , kindly advice
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