Hi sachandio,
As networks grow in scale and complexity, the Simple Network Management Protocol (SNMP) can no longer meet carriers' network management requirements, especially configuration management requirements.
Configuration management
SNMP does not provide a lock mechanism to prevent the operations performed by multiple users from conflicting with each other.
Query
SNMP requires multiple interaction processes to query one or more records in a database table.
Extensibility
Poor.
Security
The International Architecture Board (IAB) released SNMPv2 (enhanced SNMP) in 1996, which still has poor security. SNMPv3, released in 2002, provides important security improvements over the previous two versions but is inextensible. This is because SNMPv3 security parameters are dependent upon the security model.
I hope it helsp!