isro

Question

Answer 1

Ans- B.

255.255.25.192

11111111.11111111.11111111.11000000

Here network portion = 26 bits 

Comments

why d cant be the ans

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yes I think B,D both correct

Answer 2

Ans (D) has no effect on the network portion of an IP address

IP address AND ing with Subnet Mask gives NID

But as Subnet Mask all Network portion are 1's So, after XOR ing it gets no change in network portion

Comments

@vijay that only network portion is that is in D) option :)

@asutosh I still think B and D both correct

because in class D SM is 255.255.255.255

So, in this question we could not apply it

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See first of all  There are no host addresses within the Class D address space,
since all the hosts within a group share the group’s IP address for receiver purposes.

And given C subnet mask 255.255.255.192

So here 2 are subnet bit 24 network bit .So i dnt think that net bit will extended.

So option d seems to be correct.

@srestha where did u get the class D subnet mask ?

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@Manoj yes class D SM is invalid but see here http://compnetworking.about.com/od/workingwithipaddresses/a/subnetmask.htm "Applying the subnet mask to an IP address splits the address into two parts, an "extended network address" and a host address."