Simple Network Management Protocol (SNMP)

Simple Network Management Protocol (SNMP):

SNMP is the simple network management protocol used in systems nowadays. 

It includes three elements.

  1. A network management system (NMS) 
  2. Agents
  3. Managed elements or network devices.

The Network Management System (NMS) comprises applications that control the system network devices or the managed elements. It can demonstrate the results to the network management users in tabular form or pictorially. The network management system can request data from the agents.

The network devices or managed elements comprise hubs, switches, servers, routers, hosts that are managed. These devices gather and store the management data in the Management Information Base (MIB). 

The MIB can be accessed by the network devices through the Simple Network Management Protocol (SNMP).

Agents are responsible for gathering and storing the state of network devices or managed elements. The agents are controlled by software modules present on the network devices. They convert the data to a form that is compatible with the management information base of the SNMP.

The network management information exchanges through which data are sent/received are called Protocol Data Units (PDUs). The messages from PDUs are transmitted to the sensor nodes. The messages comprise values as well as attributes.

The SNMP has 5 protocol data units or message types: 

(a) Trap used for monitoring the events in the network devices. 

(b) Two for handling the configuration of the terminals. 

(c) Two for reading the values of terminals.

Every protocol data unit has values and attributes and can be used to exchange information in order to monitor the network devices.

Advantages of Simple Network Management Protocol (SNMP):

(i) It is simple.

(ii) It can be easily deployed.

Disadvantages of Simple Network Management Protocol (SNMP):

(i) It only manages the network elements, but does not support network-level management.

(ii) It consumes more bandwidth as it manages many network devices.

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