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Which of the following statements are correct regarding subnet mask 255.255.240.0?
i. Class A network subnet mask: 4096 subnets and 4096 systems per subnetwork
ii. Class B network subnet mask: 16 subnets and 4096 systems per subnetwork
iii. Class C network subnet mask: 1 subnet and 256 systems per subnetwork

(A) All are correct
(B) i, ii
(C) i, iii
(D) ii, iii

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$B?$
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It should be

1) 4096 Subnets and 4094 system assignable IP, whereas 2 are not system assignable because 1 is ID and Other is broadcast address over the subnet.

2) 16 subnets and 4094 system assignable IP, whereas 2 are not system assignable because 1 is ID and Other is broadcast address over the subnet.

3) In class C above mask i.e. $255.255.240.0$ will act as a supernet mask.
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how can it be 4096 subnet in class A here first 8 bits will be for the network id and last 11 bits will be for subnet id and from 11 bits we only able to form 2^11=2048 subnets

correct me if  m wrong here??
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First 8 bit for network

second octet 8 bits + third octet 4 bit

= 12 bit. And with 12bits u have 4096 subnets.
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oh sorry silly mistake i thought it is 224 instead of 240 well thank you

I think ans is (A)

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+1 vote
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