"as the first networks subnet is ok, what could be the next two subnets for network of 120 hosts with vlsm"
10.80.10.192 - 10.80.10.254 255.255.255.192
(note you can't use 10.80.10.161 - 10.80.10.191 because of the way the bit boundaries work)
10.80.11.0 - 10.80.11.63 255.255.255.192
so those are your next 2 subnets if you only want 2 subnets and they must cover 120 hosts. You cannot however use just one prefix/subnet mask as you have tried to do, you need to have the 2 separate prefixes/subnet masks.
As Paolo has said your question doesn't make a lot of sense. 2 consecutive networks for 120 hosts could be
10.80.10.0 - 10.180.10.63 255.255.255.192
10.80.10.64 - 10.180.10.127 255.255.255.192
but then again it could be many other combinations as well.
One other thing. I very rarely comment on ratings but i fail to see how someone can be rated a 2 when the question is so unclear. Having checked some of your other posts it appears that 2 or no rating at all is what you tend to give.
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