1. Suppose that a TCP sender send packets with 1000 bytes of data payload per packet, and assume the receiver is using cumulative acknowledgments. The sender has sent packets with sequence numbers 5000, 6000, 7000, and 8000. Assume that the third packet with the sequence number 7000 is lost and that the other three packets are delivered. If the receiver is to send an Ack after receiving the packet with the sequence number 8000, what is the acknowledgement number sent with this packet?

2. Consider a 2000-km link with a rate of 40 x 106 bps in both directions and a propagation velocity of 2 x 105 km/s, over which the HTTP protocol is used. Suppose that the initial downloaded object contains 20 referenced objects from the same server and that each of the 21 objects is 5,000 bytes in length. Packets that contain control information only are negligibly small. Ignoring any DNS lookup time,

(a) compute the Page Load Time (PLT). Assume non-persistent HTTP with no parallel connections and no pipelining.

(b) compute the Page Load Time (PLT). Assume persistent HTTP with no parallel connections and no pipelining.