Net-SNMP basic questions

Hi,
    I am new to SNMP world and had some basic questions which are
confusing me at times. Some questions might appear useless to you
experts, but they help me clarify my understanding. I couldnot find any
documentation which clearly specifies Roles of each of the terms used in
SNMP. Any help clarifying my queries would help me move further.
Following are my questions -

(1) when we do getRequest, from where the information is pulled ? Is
this from the MIBs ?
(2) If this information is pulled from the MIBs then do we need to
develop a separate application/script to populate the MIBs with correct
values ?
(3) What is the role of snmp-agent and snmp-server and snmp-client ?
(4) For every MIB, is it necessary to have a loadable module ? Can we
just write few scripts to populate a MIB without having a loadable
module ?

A real-life scenario or any concrete documentation would be very much
helpful.

Thanks in advance.

Regards,
Sagar.



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