Ace Test Series: Computer Networks - IP Inverse

Question

 

Comments

C ?

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Yes but how?

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Actually even I saw $IP^{-1}$ for first time n don't know for sure.. but here by observation..
If you make values as indices and indices as value then you will get $IP^{-1}$
for eg:- in IP at index 0, 5 is present.. then in  $IP^{-1}$ at index 5, 0 should be there.
 in IP at index 1, 8 is present.. then in  $IP^{-1}$ at index 8, 1 should be there... and so on

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That was a nice reasoning. Thanks.

Answer 1

initial permutation for an index: for example 0th; goto 0 in given IP return it's index.

and here the answer is C