How Simple Network
・What is SNMP
・Internet Network Management Architecture
・SNMP basic components
・Versions of SNMP
What is SNMP(Simple Network
Simple Network Management Protocol (SNMP) is a
component of the Internet Protocol Suite as defined by
the Internet Engineerring Task Force(IETF).
SNMP is used in network management systems to
monitor network-attached devices for conditions that
warrant administrative attention. It consists of a set of
standards for network management, including an
Application Layer protocol, a database schema, and a
set of data objects.
The internet network management
SNMP is part of the Internet network management
architecture. This architecture is based on the interaction of
many entities, as described in the following section.
• Managed object
• Management information base (MIB)
• Syntax notation
• Structure of Management Information (SMI)
• Network management stations (NMSs)
• Management protocol
SNMP basic components
An SNMP-managed network consists of three key
A managed device is a network node that contains an
SNMP agent and that resides on a managed network.
An agent is a network-management software module
that resides in a managed device.
3.Network-management stations (NMSs)
A network management system (NMS) executes
applications that monitor and control managed devices.
Versions of SNMP
SNMP has three versions.
SNMP version 1 is the initial implementation of the
SNMP protocol. SNMP version 1 operates over
protocols such as User Datagram Protocol, Internet
Protocol, OSI Connectionless Network Service,
AppleTalk Datagram-Delivery Protocol, and Novell
Internet Packet Exchange .
SNMP version 2 revises version 1 and includes
improvements in the areas of performance, security,
confidentiality, and manager-to-manager
But, because new party-based security system in
version 2 is more complex, SNMP version 2 was not
SNMP version 3 provides three important services:
authentication, privacy and access control. SNMP
version 3 is defined as the current standard version of
SNMP by the IETF. So, the IETF considers earlier
versions as obsolete or historical.