Simple Network Management Protocol - SNMP

An application layer protocol used for management and monitoring of devices on network. SNMP is used to monitor network performance and to troubleshoot issues.
SNMP provides a framework consisting of the following components
SNMP Manager: A network management application running on a PC or a Server
SNMP Agents: SNMP agent software running on a device like switch, router, firewall
Management Information Base (MIB): contains variables describing device configuration & status
SNMP manager retrieve information from SNMP agent using “get” action
SNMP manager can send/change information on SNMP agent using “set” action
SNMP agent can send their status information on their own using “trap” or “inform”
SNMP manager will send acknowledgement for messages being sent as “inform”
SNMP Versions
SNMP implementation support multiple version
SNMPv1: This is initial implementation of SNMP protocol
SNMPv2c: It improved the performance in terms of security of SNMPv1 using community strings
SNMPv3: It provided confidentiality, integrity and authentication to SNMP


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