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Im a bit lost with this question. In order to get proceed with the vslm i need to find the Major network of this subnet 121.118.40.0 /19. For me the major network is 121.118.32.0/19, but when I run vslm calculator I get as major network 121.118.0.0/16....how is this possible?

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i need to find the Major network of this subnet 121.118.40.0 /19.

Actually, 121.118.40.0 /19 is not a subnet, it is the 2048th host address on the 121.118.32.0/19 network. You, apparently have a crappy calculator.

You seem to have correctly figured the network for that address and mask. This two-part answer explains about how to calculate the network.

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