Network Management Systems: Concepts, Standards, and Protocols, Exams of Advanced Accounting

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• (^) The Concept
  • (^) From a central computer, network administrator can manage entire network - (^) Collect data - (^) Give commands
  • (^) Moving gradually toward this ideal Data Command

• (^) Standards
  • (^) Most widely used is the Simple Network Management Protocol (SNMP)
  • (^) Other standards exist SNMP

• (^) Managed Nodes
  • (^) Routers, client PCs, etc. that are managed Managed Node

• (^) Agents
  • (^) Network management agents
  • (^) Installed in managed nodes
  • (^) Communicate with the manager on behalf of the node Manager Agent Managed Node

• (^) Objects
  • (^) Managed nodes have several objects that are managed
  • (^) For instance, on a client PC, one object might be the status of a TCP connection to a particular server
  • (^) Another example would be the status of a router port Agent (^) OBJ OBJ OBJ OBJ

• (^) Objects
  • (^) A managed node may have several “ instances ” of some objects; For instance, a router may have several ports Agent (^) OBJ OBJ OBJ OBJ

• (^) Management Information Base (MIB)
  • (^) Full MIB is stored on the central administration computer
  • (^) Relevant portion of the MIB is also stored by each Agent Manager Agent MIB MIB

Network Management Protocol

• (^) Network management protocol standardizes Communication between manager and agent
• (^) Defines the schema of the MIB
• (^) Most popular is the Internet Engineering’s Simple Network Management Protocol (SNMP)
• (^) There are others

Network Management Protocol

• (^) SNMP Requests and Responses
  • (^) Agent sends back responses
    • (^) The information
    • (^) Confirmation or reason for rejection Manager Agent MIB MIB Response

Network Management Protocol

• (^) SNMP Traps
  • (^) Agent can send a message without a prior manager request
  • (^) Message is called a trap in SNMP
  • (^) For instance, if the agent senses a problem Manager Agent MIB MIB Trap