Web URL redirection on ICM server

Hi,My Existing setup consists of a Domino Utility Server running my appplications. I wish to and anather utility server, Enable clustering for both of them and Add an ICM server.

So the users will be accessing my ICM server. Currently i don’t have any DNS server, so on each clients machine i have updated the hosts file.

I wish to know, if my servers are as follows

icm.domain.com ( ICM Server)

server1.domain.com (Utility server 1 in Cluster)

server2.domain.com (Utility server 2 in Cluster)

Do i have to update my hosts file on all the clients with these three entries ?