ME TEST SERIES

Question

In IPv4, a router is sending IP packets whose total length (data + header) is 2048 bytes. Assuming that packet lifetime is 10 sec, the maximum data line speed router can operate at without wrap around of identification number of datagram ________ (in Mbps). (Upto 2 decimal places)

Comments

Wrap around of identification number of datagram

This sentence say wrap around related with identification number means within 10 sec identification number should not be reused.

So we have to send 2^16 packets in 10 sec (because of 16 bit field in IP header).

Now further calculation is straight forward !

Answer 1

Wrap around time is total no. packets that can be send in a single life span of packet so total identification bits of ipv4 is 16 bits so total no. of packets is 2^16 and each packet is 2048 bytes so total no. packets can be send is (2^16*2048)/10=107.37Mbps