Question

求高手帮解答两道计算机网络基础的题目. 原题是英语将就着看下吧，最好能写出详细解答 中文即可～

1. We are sending a 50*106 bits MP3 file as one message from a source host to a destination host. There are two links between source and destination, with one router connecting the two links. Each link is 5,000 km long. All links have a transmission rate of 10 Mbps. There is no congestion, so that the message is transmitted onto the second link as soon as the router receives the entire message. How long is the end-to-end delay (i.e. latency)? (Assume that the propagation speed is 2*108 meters/second.)
翻译器（1。我们发出一个50 * 106位MP3文件作为一个消息来源主机到目的地主机。有两个来源和目的地之间的联系,有一个路由器连接两个链接。每个链接连5000公里长。所有的链接有一个传输速率的10百万位元/秒。不存在阻塞,使信息传递到的第二个链接一旦路由器收到完整的讯息。多长时间延迟的端到端延迟(即)?(假设的传播速度是2 * 108米/秒。)

2. Assume node B is at 10th hop from node A. The propagation delay is 400ms per hop, the packet size is 20 KB, and the data rate is 128000bps. Queuing delay and processing delay are negligible. In a packet-switched datagram network, how long does it take to send a 500KB file from A to B.?
翻译器
假设节点B是在第十跳节点传输延迟是400ms a的每跳,这个数据包大小是20(KB),是128000bps数据率。排队延迟和处理迟延是可以忽略不计的。在分组交换数据网络,需要多长时间发一500KB文件从a到b吗?

Answer 1

奥深