Computer Networks

Question

What is the significance of this line(highlighted part): Node D get this flood packet from nodes C, F,B,E in this order.

Other things are clear to me.

Comments

If D can get packet from C and B at a time, then D will accept packet from C and discard B.

But D get packet from B due to shortest distance from S, at that time C is not transmitting any packet to D. So accept packet from B instead of waiting packet from C.