Dell PowerConnect 5012 User Manual Addendum page 9

SNMP Host Authorization Table:
If the host authorization is disabled, which is the default setting, the
switch allows any SNMP manager to access the switch. If the host
authorization is enabled, the administrator can specify up to 16 SNMP
managers on the host table to access the switch.
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Addendum to the 30 24, 3048 , and 5012 User 's Guides