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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-24 15:24:21 发布人：wongrs | |
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Which window size is more efficient? A. Window size = 3 B. Window size = 1 C. Window size = 2 D. Window size = 4 E. Window size = 5 Answer: A - The number of data segments the sender is allowed to have outstanding before it receives and acknowledgment is called the window. A window size of 3 allows the sender to send three data segments before expecting an acknowledgment. A window size of 1 would require an acknowledgment after each data segment. 3) Once data transfer is initiated between two hosts, congestion can occur. What are two reasons for congestion? A. A high-speed computer might be able to generate traffic faster than the network can transfer it. B. When datagrams arrive at a host or gateway too quickly to process, they are stored in memory temporarily. The host or gateway can fill its memory so that it can accept no more datagrams. C. Different applications can saturate the bandwidth with larger segments than the network can handle. D. Some applications are written with less reliability than others are. Answer: A & B - A high-speed computer might send traffic faster than the network can transfer it and the host or gateway could exhaust its buffer. The transport layer can issue a "not ready" indicator to the sender so that data is discarded. 4) You are reviewing a consultant's design for your 10Base5, thick Ethernet, network. The following distances are outlined. Host A to Host B is 190 meters. Host B to Host C is 160 meters. Host C to Host D is 300 meters. Host D to Host E is 600 meters. Which distances are too far according to the specification? A. Host A to Host B B. Host B to Host C C. Host C to Host D D. Host D to Host E Answer: D - The 10Base5 specification is 500 meters (1640 feet). 5) Put the following fields into order for an Ethernet frame (not all of the fields belong to the Ethernet frame). FCS Type Data Preamble SA DA Length 802.2 Header and Data A. Preamble, DA, SA, Type, Data, FCS B. Preamble, DA, SA Le
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