Question

If the No of subnets is A (A=09), find the value of X in subnet mask 255.255.X.0

please do step by step

Answer 1

If the No of subnets is A (A=09), find the value of X in subnet mask 255.255.X.0

The universal formula to find total no of subnets is 2ⁿ where n is total no of network bit borrowed from host octet so in above question it says tha no of subnet is 9 which is impossible by universal formula but it can achieve by some other methods of subnetting like VLSM (Varriable length subnet masking) see below how we achieve the 9 subnets

First we divide our network in two (n = 1, no of subnets will be 2¹ = 2) Subnets A and B using subnet mask 255.255.128.0

Then we Divide subnet B into 8 subnets (n = 3, no of subnets will be 2³ = 8) B1, B2, B3, B4, B5, B6, B7, B8 using subnet mask 255.255.240.0

Now we have total of 9 subnets that is A,B1, B2, B3, B4, B5, B6, B7 and B8

Then we have two value of X with after compairing 255.255.X.0 with above subnet masks one is 128 and other one is 240

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