SNMP community strings authenticate access, with defaults posing security risks if unchanged.
WhyCis correct:
A:"public" is the standard read-only default, per SNMP specs and CNSP.
B:"private" is the standard read-write default, also per SNMP and CNSP.Both are true, makingCthe answer.
Why other options are incorrect:
1, 2:Exclude one true statement each.
4:Both statements are true, so "none" is wrong.
References:CNSP "SNMP Security" (Section on Defaults) confirms "public" and "private" as standard community strings.
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