What type of server does a window client use to resolve host names to IP addresses?
Strictly speaking, Windows clients will use a DNS server to
resolve host names to IP addresses. In a Windows environment, the
DNS server is almost always a Domain Controller as well (Active
Directory Integrated DNS). Windows also has another naming system
called NETBIOS. Clients will use a WINS server to resolve NETBIOS
names (do not confuse with host names) to IP addresses.
Short answer: DNS