5.1.b Implement and troubleshoot device access control

5.1.b [ii] SNMP

SNMP is an application-layer protocol that provides a message format for communication between SNMP managers and agents. SNMP provides a standardized framework and a common language used for the monitoring and management of devices in a network.

The SNMP framework has three components:

● An SNMP manager

● An SNMP agent

● A MIB

The SNMP manager is the system used to control and monitor the activities of network hosts using SNMP. The most common managing system is called a Network Management System (NMS). The term NMS can be applied to either a dedicated device used for network management, or the applications used on such a device. A variety of network management applications are available for use with SNMP. These features range from simple command-line applications to feature-rich graphical user interfaces (such as the CiscoWorks2000 line of products).

The SNMP agent is the software component within the managed device that maintains the data for the device and reports these data, as needed, to managing systems . The agent and MIB reside on the routing device (router, access server , or switch). To enable the SNMP agent on a Cisco routing device, you must define the relationship between the manager and the agent. The Management Information Base (MIB) is a virtual information storage area for network management information, which consists of collections of managed objects . Within the MIB there are collections of related objects, defined in MIB modules.

The SNMP agent contains MIB variables whose values the SNMP manager can request or change through Get or Set operations. A manager can get a value from an agent or store a value into that agent. The agent gathers data from the MIB, the repository for information about device parameters and network data. The agent can also respond to manager requests to Get or Set data.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Location 5031).  . Kindle Edition.

http://www.cisco.com/en/US/docs/ios/12_2/configfun/configuration/guide/fcf014.html