I have a question that I hope someone can answer.

Scenarios:
1. A workstation that uses dhcp to assign the IP address and DNS
server
addresses. I do a nslookup for computer1 . The server responds backcorrect with the appended domain name ex. computer1.domain.net

2. A workstation that uses a static entered IP address and static
entered
DNS server addresses. I do a nslookup for computer1. The server
responds
back with an error, DNS request timed-out
Now if I put the domain suffix to the name, the server responds
correct.
ex. computer1.domain.net

Why is this and do I have a configuration incorrect?

Thanks