$(35$ points$))$ Suppose a TCP segment of size $3000$ bytes is passed to IP for delivery across three networks of the Internet $($i$.$e$.$ from the source host to a router say R$1$ to another router say R$2$ then to the destination host$).$

The first network has an MTU of $1260$ bytes; the second network has an MTU of $880$ bytes; and the third network has an MTU of $1100$ bytes. Each network's MTU gives the size of the largest IP datagram that can be carried in a data$-$link layer frame.

$($Note: An MTU value includes $20$ bytes of IP headers.$)$

Assume all IP headers are $20$ bytes. Give values of the flag, the length $($header $+$ data$)$ and offset fields in the sequence of fragments delivered to the network layer at R$1,$ R $2,$ and the destination host. It is important for you to be reminded that segment reassembly is only done at the final destination host.

You must justify your answers. No justification$=0$ point.

For each of R$1,$ R$2,$ and the destination host, I am expecting a table like following.

$\backslash$table$[[$Flag$,$Offset,Length$],[?,?,?$