Allied Telesis AT-S63 User Manual

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Chapter 3: SNMPv1 and SNMPv2c
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Section I: Basic Operations
Default SNMP Community Strings
The AT-S63 Management Software provides two default community 
strings: public and private. The public string has an access mode of just 
Read and the private string has an access mode of Read/Write. If you 
activate SNMP management on the switch, you should delete or disable 
the private community string, which is a standard community string in the 
industry, or change its status from open to closed to prevent unauthorized 
changes to the switch.