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A computer in the ZZZ Corporation needs to resolve a DNS query for www.zzz.com.
It submits the query to the assigned DNS server (Step 1). If its cache contains the
necessary data, the server will respond to the client. Otherwise the server forwards
the query to the DNS server containing the zzz.com. zone (Step 2). Since the server
is authoritative for the name www.zzz.com. it resolves the query and returns the
response to the client through the forwarding DNS server (Steps 3-4). At this point it
is important to emphasize the significance of the fact that the zzz.com. zone on the
internal DNS server contains both internal and external names. If it contained only
internal names then this query would not be resolved and name error would be
returned to the client.
Finally, consider an example of a corporate computer that needs to resolve a host
name from the private namespace of a merged company.
A computer in the YYY Corporation needs to contact a computer myname.zzz.com.
Windows 2000 White Paper 54
External world / Global Network
YYY corporation
ZZZ corporation
YYY corporation
ZZZ corporation
VPN
VPN
Proxy Server
Firewall
A
DNS Server, Firewall, VPN or Proxy Server
A
DNS Client
first.yyy.com. second.yyy.com. third.yyy.com. third.zzz.com.first.zzz.com.
second.zzz.com.
. zzz.com.
yyy.com.
yyy.com.
yyy.com. zzz.com.
someother.com.
com.
.
1
2
1
2
Zone.Name.
Primary Zone Secondary Zone
Zone.Name.
3
3
4
4
5
6