This object determines how the net-snmp-specific VACM access-control extension matches an SNMP request's context name against the configured context prefix for this access entry: exact(1) requires the context name to match precisely, while prefix(2) allows any context name that starts with the configured prefix to match. Administrators use prefix matching to grant access across a whole family of related SNMP contexts with a single rule rather than one entry per context. For example, setting this to prefix(2) with a context prefix of 'vlan' would let a single access rule apply to contexts like 'vlan10', 'vlan20', and any other context beginning with 'vlan'.