What is the difference between subnet mask and default
subnet mask

Answer Posted / amar pratap

The default subnet mask just inbuild network portion(bits)
which is already define.in ipv4 class A has default subnet
mask is 255.0.0.0,for Class B =255.255.0.0,and for class C
= 255.255.255.0, where as subnet mask represent the number
of bits used by network and rest for Host(after
subnetting).if there is no subnetting occur in network then
the both are same.

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