Test Series

Question

Comments

I have one question

Why should all the packets have different ID??

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@ Shadan Karim,

please $\underline{\text{add test-series name in title}}$.

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@aambazinga why are you doing 2^48/2^32?

Answer 1

The Question is wrong . It should be: each "packet"  [NOT HOST, IT IS WRONG ] in the network is identified by 48 bit number 
Each "packet" in the network is identified by 48 bit number
Host Wrap Around Time = Total no of Packets  / Total no of IDs generated by IPv4 hosts.  
It is a IPv4 network, So, Consider the no of hosts to be 2^32  i.e equal to the number of IP addresses and 1 host generates 500 packets.

Total Packets generated =  2 ^ 48 packets
Rate of generation = [(2^32) * 500] packets per second 

Host Wrap Around Time 2^[48-32] / 500 = 131.072 seconds.

REFER GATE QUESTION : GATE-CS-2014-(Set-3) | Question 65

Comments

The concept is similar to the Wrap Around Time used as in the case of sequence no in TCP which gets exhausted with each byte of data being generated.

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Every host in an IPv4 network has a 1−second resolution real-time clock with battery backup. Each host needs to generate up to 1000 unique identifiers per second. Assume that each host has a globally unique IPv4 address. Design a 50−bit globally unique ID for this purpose. After what period (in seconds) will the identifiers generated by a host wrap around?

https://gateoverflow.in/2062/gate2014-3-28

 

The question needs to that specific to answer because a host can generate 5000 packets with the same ID