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Question 4 [10pts]: Read the sender side of rdt3.0 as follows. Consider STATE "wait for call 1 from above. Please explain the following two event/actions in detail, i.e., what happens, why happens, what are the reactions and why are the reactions. rdt_send(data) sndpkt = make_pkt(1, data, checksum) udt_send(sndpkt) 1) start_timer rdt_rcv(revpkt) 2) A rdt_send(data) rdt_revirovpkt) && sndpkt = make_pkt/0, data, checksum) (corrupt(revpkt) || udt_send(sndpkt) isACK(revpki, 1)) rdt_revrcvpkt) start_timer A Wait for Wait for timeout call Ofrom above ACKO udt_send(sndpkt) rdt_revirevpkt) start_timer && notcorruptrevpkt) rdt_revrovpkt) && ISACKircvpkt,1) && notoorruptrevpkt) stop_timer && isACKirovpkt,0) stop_timer Wait Wait for timeout for call 1 from udt_send(sndpkt) ACK1 above start_timer rdt_rev(rcypkt) rdt_send(data) A rdt_rcv(revpkt) 88 ( corrupt(revpkt) || sndpkt = make_pkt(1, data, checksum) ISACKircupkt,0)) udt_send(sndpkt) start_timer 1