Submit the decimal representation of the subnet mask from the following CIDR: 10.200.20.0/27

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Submit the decimal representation of the subnet mask from the following CIDR: 10.200.20.0/27

the answer it’s 255.255.255.224

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Would love to know how you got that answer

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the CIDR suffix it’s the sum of all bits in one in the subnetmask which it’s 4 octet with 8 bit each one of them,so if you have CIDR suffix /27 that mean there is 27 bit in one,next you start from left to right replacin the 0 into 1., and them the only thing you need to do is convert binary to decimal, and there you go you answer
11111111.11111111.11111111.11100000
255 . 255 . 255 . 224

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Thanks mate means a lot i ahve not touch on subnetting for a long time. Only in the MCSE days back in 2003. Need to brush on this watch a few youtube vidoes and practice subnetting :slight_smile:

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