I'm using Ubuntu workstation (14.04), using OpenLDAP for authentication. The /etc/nsswitch.conf files on these look like this so that to get a host it should try files, then LDAP and then go on to check DNS:
passwd: files ldap
group: files ldap
shadow: files ldap
hosts: files ldap dns mdns4_minimal [NOTFOUND=return]
networks: files ldap
protocols: files ldap
services: files ldap
ethers: files ldap
rpc: files ldap
netgroup: ldap
aliases: ldap
Most of my hosts on our network are just defined in our DNS, which works fine using nslookup, but getent hosts only returns entries defined within LDAP or files.