D-Link 16-Port 10/100/1000Mbps Gigabit Ethernet Switch + 2-Port Mini GBIC Web-Smart Switch DGS-1216T - Manual (Page 42)

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manage the device. These objects are defined in a Management
Information Base (MIB), which provides a standard presentation of
the information controlled by the on-board SNMP agent. SNMP
defines both the format of the MIB specifications and the protocol
used to access this information over the network.
The Switch supports the SNMP versions 1. In SNMP v.1, user
authentication is accomplished using 'community strings', which
function like passwords. The remote user SNMP application and the
Switch SNMP must use the same community string. SNMP packets
from any station that has not been authenticated are ignored (dropped).
The default community strings for the Switch used for SNMP v.1
management access are:
public - Allows authorized management stations to retrieve MIB
objects.
private - Allows authorized management stations to retrieve and
modify MIB objects.
Traps
Traps are messages that alert network personnel of events that occur
on the Switch. The events can be as serious as a reboot (someone
accidentally turned OFF the Switch), or less serious like a port
status change. The Switch generates traps and sends them to the
trap recipient (or network manager). Typical traps include trap
messages for Device boot up, Authentication Failure, Port status
change and Abnormal transmit/receive data packet error.
MIBs
Management and counter information are stored by the Switch in the
Management Information Base (MIB). The Switch uses the standard
MIB-II Management Information Base module. Consequently, values
for MIB objects can be retrieved from any SNMP-based network