ip packet

Question

a router is blasting out IP packets whose total length (data+header) is 1024 bytes.assume packet live for 10 sec ,what is the max line speed the router can operate at without danger of cycling through the IP DATAGRAM  ID number space?

Comments

I think answer is 53.68Mbps 

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Seems correct @chauhan sir

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Bro, no sir. please

Answer 1

In IPV4 header Identification number field is $16$bit, and an ID number is associated with each packet means you can assign unique ID number to $2^{16}$ packets and each packet contains $1024$ bytes of data.

So, You must transfer $2^{16}*1024B$ of data within $10$ seconds.

So, BW $\color{navy}{= \frac{2^{16}*1024*8\;bits}{10\; sec} = 53.68\;Mbps}$

Comments

ohh..you divided by 10⁶ ...ok....i have done by 2²⁰...

btw can you tell when should we use 10⁶ or  2²⁰  ??

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@Gabbar here since we are interested in BW..its in 10 powers...anything related to link or BW kind of things we use in 10 powers...and anything like data or which u r storing in computer we use 2 powers..as it is easier to partition inside the memory

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@sudsho is rt. For data it should be $2^{20}$, means $2MB = 2^{21}B$ not $2*10^6$
But for BW, $2MBps = 2*10^6Bps$.