2. [20 pts.] Find Di, di, and the total end-to-end delay for the following store-and-forward scenario: Two end-systems separated by a fiber-optic path of 400 km. Path has 5 identical links, with transmission rates of 10 Mbps. Number of packets is 1000 packets, each is 10 kilobits in size. Average queuing delay per node is 2 ms. Average processing delay per node is 5 ms. Repeat the problem when the processing delay is negligible. Recall that packet processing and queuing only takes place at the intermediate nodes