Dynamically loaded modules are a means of including a MIB implementation
  module within the main SNMP agent (or an AgentX subagent) without needing
  to re-compile and re-link the agent binary.  Instead, details of the
  module(s) to load are specified in the configuration file, and the agent
  locates the files listed, and merges them in at run time.

  See http://www.net-snmp.org/tutorial-5/toolkit/dlmod/ for more information.


간단히보자면..... 동적으로 로드된 모듈에 대해서 MIB값을 구현하기 위한 수단이라는듯;;;