the mechanisms of retrieving table

Hi,all,

    I have some confusion on the mechanisms of retrieving table. 

    In the codes of application "snmptable", the oid "name" is filled
in function "get_field_names", and function "get_table_entries" pack
every oid "name" into request. However, how dose "get_field_names" know
the exact oid before sending any request? To give an example， I want to
get the ipRouteTable(1.3.6.1.2.1.4.21). "get_table_entries" send a
request with oid "1.3.6.1.2.1.4.21.1.1.210.43.192.192". but how does it
know there is an address "210.43.192.192" in the net?
    
    Thanks.


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