Lmhosts or hosts?

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Had a bit of confusion while doing Measure Up practice tests. I know that in a workgroup i.e. the same subnet, communication is done through NetBios names. Name resolution is done by lmhosts, while domain name resolution is done by the hosts file.

But if i want to access shares on any other computer on a different subnet, will i require resolution by hosts or by lmhosts (assuming DNS and WINS server are offline/not present)?

Also, when is routing required? when two computers are on a separate network or separate subnets?

 

thanks sparky!