Which statement is true about configuring a nameserver in Oracle Linux?
A.
if it is a primary nameserver, it must be an authoritative nameserver for all zones.
B.
if it is a recursive nameserver, it must be a cache-only nameserver for all zones.
C.
it may be authoritative for some zones and cache-only for other zones.
D.
If it is a secondary nameserver, it must be an authoritative nameserver for all zones. O E If it is a secondary nameserver, it must copy zone data from a primary nameserver.
E
Acting as a backup to a master name server, a slave name server maintains a copy of the zone data, which it periodically refreshes from the master’s copy. In older documentation, slave name servers are known as secondary name servers.
C
A, B, D & E all say “must”, meaning “always true without exception”. C is true – a nameserver can be authoritative for some zones and cache-only for others, even if this is not a recommended configuration, which directly contradicts A, B, and D. Therefore, A, B & D are false.
Secondary nameservers can refresh zone data from a Primary *or* from another Secondary, meaning E is not true without exception – therefore it is false.
Only “C” remains. It must be the correct answer.
E