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Consider fragmenting an original IP datagram of size $5000$ bytes with a base header

only. The offset of the second fragment is $125.$ Answer the following questions:

$($a$)$ What is the number of fragments? $($Assume that all fragments except the last one are equal.$)$

$($b$)$ What is the size of the $2$nd IP fragment?

$($c$)$ What is the size of the last IP fragment?

$($d$)$ What is the fragmentation offset of the $3$rd IP fragment?