SNMP
	- Simple Network Management Protocol
	- Developed in 1988
		- DE facto standard for internetwork management
		- Simple Network Management Protocol
	- Monitor and/or configure devices on the network
		- polling
		- receiving traps
	- composed of two main components
		- Manager
			- console admin uses to perform networm management functions
		- Agent
			- interface to actual device being managed
	- Terminology
		- managed device
		- Agents
		- Network management system
			- Nagios
			- OPSView
			- HP openview
			- Graphing tools (MRTG, Cacti)
		- MIB - Management Information Base
			- hierarchical collection of information that can be monitored by SNMP Manager.
		- Get/Response system
			- Management software requests information
			- changes config on remote agent
			- Agent intitiates traffic if threshold is reached (trap)


		- Agent
			- software running on device being monitored
				- install
				- external
				
		- Polling
			- Querying an agent (router,server, switch)
			- Network Management Station will poll agents
		- Trap
			- initiated from agent to NMS
			- alert usually when something has happened
			- NMS will perform some action
			
		- MIB
			- management Information base
				- database of objects
				- defines all types of status and statistical information
				- MIB's can be custom
			- All agents implement MBI-II
				- provides general TCP/IP management information.
		- Transport Protocol
			- uses UDP
			- low overhead
			- Port 161 for sending/receiving requests
			- Port 162 for trap
		
		- Communities
			- SNMPv1 and SNMPv2, SNMPv3
			- establish "trust" between manager and agent
			- three community types
				- readh-only (default-public)
				- read-write (default- private)
				- TRAP
				
			SMI and OID
							Root Node
								|
								|
							   /|\
							  / | \ 
							 /  |  \
					
					ccitt(0)   iso(1)  joint(2)
								\
								org(3)
									\
									dod(6)
										\
										internet(1)
											\
											internet(1)	
								/		/		\						\		\
						directory(1)  mgmt(2)   experimental(3)		private(4)   SNMPv2(6)
						
				- some important OIDs
					- 1.3.6.1.4.1.2 IBM
					- 1.3.6.1.4.1.9 Cisco
					- 1.3.6.1.4.1.11 - Hewlett-Packard Company
					- 1.3.6.1.4.1.23 - Novel
				- SNMP Operations
					- get
					- get-next
					- get-bulk (SNMPv2 and 3)
					- set
					- set-response
					- trap
					- notification (SNMPv2 and SNMPv3)
					- info (SNMPv2 and SNMPv3)
					- report (SNMPv2 and SNMPv3)
				- configuring Agents
					- sysContact
					- sysLocation
					- sysName
					- Read-only and Read-write community name
					- trap destination
			
	Assignment: How Performance Monitoring works in Windows?