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计算机网络期中考试题 B卷基础概念题(10 points) 1. What is the difference between congestion control and flow control? Congestion control prevents overrunning buffers in work, while flow control prevents overflowing the receiver ’ s. 2. What are the two primary causes of packet loss? Electrical noise that corrupts the signal and 2) buffer overflow in an intermediate node due to congestion. 3.work'ponents can be divided into 3 parts? What are they? Ans: 网络接入,网络边缘,网络核心 4. Name three email access protocols (that is, from user agent to SMTP server) for email download. ( 2pts total ,1 pt each item ) POP, IMAP, and HTTP 5. Many Web sites use cookies. List the ponents . ponents: 1) cookie header line of HTTP response message 2) cookie header line in HTTP request message 3) cookie file kept on user ’s host, managed by user ’s browser 4) back-end database at Web site Delay: (10 points)Name the four factors of delay for a packet. Then, identify which factor will most likely predominate (i.e., be the largest factor) for 1000 Byte packets ina flow on a 1) 10 Mb/s LAN segment between two PCs in the same building, 2)1 Mb/s geosynchronous-orbit satellite link between the US and Nepal, 3) on the between the US and Nepal. 1 pt each identified largest factor (3 pts total) (8pts)The four factors of packet delay are processing , transmissi on , propagation , and queueing . For (1) the predominant delay will be tra

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