Simple Network Management Protocol (SNMP)

SNMP is a lightweight #Application Layer Protocol# allowing remote and local #management# of items or Network Device on the network. It is part of #Internet Protocol Suite (TCP/IP). SNMP comprises of two entities: agents who are running on managed node and collecting information about the node, and managers who are running on management workstation that requests information about devices on the network.

Note: SNMP doesn’t provide security management to the #Network Management System (NMS). It severely lacks authentication capability.

The managers issue GetRequest, GetNextRequest, and SetRequest messages to port# 161 which the agents should reply with GetResponse message to the same port. The managers listen to the port 162 in case there is a Trap message issued by the agents due to changes in Management Information Base (MIB) and underlying node.

There are three specifications of SNMP issued attempting to standardise SNMP implementation:

SNMP is universally supported and portable. It also quite extendible and allows distributed management access.

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Well-Known Ports

#Simple Network Management Protocol (SNMP)
TNS3131 Chapter 8: Network Management Security

Simple Network Management Protocol (SNMP)
SNMPv3 1998

#SNMPv3, defined by RFC 2570 - 2575, addresses security issues of #SNMPv1 1988 and #SNMPv2 1993 by using User Security Model (USM), including overall architecture and security capability. It provides authentication service# that is part of User-Based Security (UBS), privacy# (Data Encryption Standard (DES) message encryption), and Access Control# to allowed operations, device information, and Management Information Base (MIB) access.
SNMPv2 1993

#SNMPv2, later revised in 1996, is a revision to #SNMPv1 1988 specified by RFC 1901 - 1908 which supports distributed network and adds more functionality to it. It improves the performance, security, confidentiality, and manager-to-manager communications.
SNMPv1 1988

#SNMPv1 is defined by RFC 1065 - 1067 which specify as a protocol supporting stand-alone Management Station or Manager and Management Agent. Limited but easily implemented Management Information Base (MIB) of scalar variables and two dimensional tables are defined. It is designed to be a streamlined (simple but efficient) protocol with limited functionality such as allows only centralised network management. The connection between the manager and agent is done using User Datagram Protocol (UDP)#.
Network Management System (NMS)

NMS is a set of #hardware and/or #software tools that allows administration of individual components of a network within a larger Network Management# framework. It consists of Management Station or Manager#, Management Agent#, Management Information Base (MIB)#, and Network Management Protocol#. These components assist in Network Device# discovery, network device monitoring, network performance analysis, and intelligent notifications.
Internet Protocol Suite (TCP/IP)

Simple Network Management Protocol (SNMP)#
Application Layer

Simple Network Management Protocol (SNMP)#

#networking #communication