A stream of packets travel along a path with 10 links and nodes in the Internet. Each link is 100 km long and of 45 Mbps capacity, and has a propagation speed of 2 × 10^8 m/sec. Assume no flow control, no other traffic along the path, and the source pumps packets at wire speed. a. What is the number of bits contained in each link? b. If the average latency through each node is 5 ms, what is the average number of bits contained in each node? c. How many bits on the average are contained in the path? 2 . 一个数据流在互联网中沿着具有 10 条链路和节点的路径传播。每一条链路长 100 公里,拥有 45 Mbps 容量,传播速度为 2 × 米 / 秒。假设没有流量控制,路径上也没有其他流量,源以线速度发送分组。 a. 在每条链路上将包含多少比特位? b. 如果通过每个节点的平均延迟为 5 毫秒,则在每个节点平均包含多少比特位? c. 在路径上平均包含多少比特位?