Given the contents of a zone file:
;
$TTL 3D
@ IN SOA ns1.store.com. hostmaster.store.com. (
200411152
3600
3600
3600
3600 )
;
NS ns1
store.com. MX 10 mail
;
localhost A 127.0.0.1
ns1 A 170.63.2.2
buy A 170.63.2.51
mail A 170.63.2.5
dhcp CNAME ns1
www CNAME buy
relay CNAME mail
Which two statements are true? (Choose two.)
A.
This is a reverse zone file.
B.
The hosts www and buy are the same system.
C.
The command dig @ns1.store.com relay.store.com returns an A record entry of 170.63.2.5.
D.
A remote DNS server caching a record for mail.store.com flushes the entry every 10 days.