IP Datagram

Question

will it be (2¹⁶-20) or [(2¹⁶-1)-20]??

Comments

Asking size not max limit .. 2¹⁶- 20( sinze min header)

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I too think the same....but ans given (2^32-1)-20

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@kishalay max size of data portion= total length - header size
    here assume 20 byte header and total length field shows max when all 16 bits in total length field are 1 
so its decimal equivalent is 2¹⁶ -1 (total length)
 so max data length= (2¹⁶ -1) - 20.

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Thats true...,make it as answer

Answer 1

 max size of data portion= total length - header size 
    here assume 20 byte header(minimum) and total length field shows max when all 16 bits in total length field are 1  
so its decimal equivalent is 2¹⁶ -1 (total length) 
 so max data length= (2¹⁶ -1) - 20.