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Q1: no, it will round robin between the IP addresses
Q2: no, it only returns the hostname server1.contoso.com (via nslookup)
Q3: no, if you test with nslookup, it will round robin. But if you ping the hostname from the same host, it will always return the same IP because of the way caching works
@Sheen Ismhael Lim
The correct answer is:
Yes (with netmask ordering, the DNS server will give the ip address which is in the Class C subnet of the DNS client on top of the list)
No (I don't see an A record that resolves server1 to an ip address)
No
Why the
When server2 queries for host1.contoso.com, the server always resolves to 172.16.1.100 -> No
I believe it is no, becaue the "Enable round robin" option is enabled on the Advanced Tab.
In the real world, server2 might get 172.16.1.100, 172.16.2.100, or 172.3.100 because it is up to the DNS which one it will give to the DNS client. If a workstation requested host1.contoso.com and was given 172.16.1.100, then servers requested host1.contoso.com, then server2 will get the 172.16.2.100, then 172.16.3.100 to the next host requesting the host1.contoso.com record, then back again.
When Server2 queries for host2.contoso.com, the server always resolves to an IP address. -> Yes
I believe it is yes, because requesting the host2.contoso.com record will return a server1.contoso.com A record, which will return the IP address of the server1.contoso.com (Name Server record)
When a host that has an IP address of 172.16.100.1 queries for host1.contoso.com, the host always resolves to 172.16.1.100 -> No.
I believe this is no, the same explanation applies to this question from the first question. Doesen't matter what IP the request came from if the "Enable round robin" option is enabled, A record with the same name will always be distributed "round robin style".