This read-write string is the SNMP community name that must be presented by requests coming from the host matched by this ACL entry, defaulting to 'public' if left unconfigured. An admin changes it away from the default to prevent unauthorized parties who guess or know the default community from gaining access. For example, setting cpqnAclIPCommunity to a custom string for a specific management-station rule ensures only that community/address pair is honored, closing off the well-known 'public' default.