snmp

simple network management protocol

key components:
1. management stations(managers)
such as monitor and control network

2. network elements(Agent)
such as hosts, routers. each contains an agent

MIB( management information base)
a collection of MO( management object)
each agent maintain an MIB

SNMP service
1. get request
get the value of MO in the MIB of agent

2. get next request
get the value of next MO in the MIB of agent

3 set request
update the value of MO in the MIB of agent

4 trap request
report extraordinary events to manager

default UDP port:
manager: 162
agent : 161

OID(object identifier)