ANDREW S. TANENBAUM
------COMPUTER NETWORKS FOURTH EDITION PROBLEM SOLUTIONS
Collected and Modified By YanZhenXing,
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Classify:
E脿
Easy, M脿
Middle, H脿
Hard
锛?/p>
D脿
Delete
Green: Important
Red: Master
Blue: VI
Others:Know
Grey:
Unnecessary
Chapter 1 IntroductionProblems
2. An alternative to a LAN is simply a big timesharing system with terminals for
all users. Give two advantages of a client-server system using a LAN.(M)
浣跨敤灞�鍩熺綉妯″瀷鍙互瀹规槗鍦板鍔犺妭鐐广�?/p>
濡傛灉灞�鍩熺綉鍙槸涓�鏉￠暱鐨勭數缂嗭紝涓斾笉浼氬洜涓埆鐨勫け鏁堣�屽穿婧?/p>
(
渚嬪閲囩敤闀滃儚
鏈嶅姟
鍣?/p>
)
鐨勬儏鍐典笅锛屼娇鐢ㄥ眬鍩熺綉妯″瀷浼氭洿渚垮疁銆?/p>
浣跨敤灞�鍩熺綉鍙彁渚涙洿澶氱殑璁＄畻鑳藉姏鍜屾洿濂戒氦浜掑紡鎺ュ彛銆?/p>
3. The performance of a client-server system is influenced by two network factors:
the bandwidth of the network (how many bits/sec it can transport) and the latency
(how many seconds it takes for the first bit to get from the client to the server). Give
an example of a network that exhibits high bandwidth and high latency. Then give
an example of one with low bandwidth and low latency.(E)
妯疮澶ч檰鐨勫厜绾よ繛鎺ュ彲浠ユ湁寰堝鍗冨厗浣?/p>
/
绉掑甫瀹斤紝
浣嗘槸鐢变簬鍏夐�熷害浼犻�佽瓒婅繃鏁?/p>
鍗冨叕閲岋紝鏃跺欢灏嗕篃楂樸�?/p>
鐩稿弽锛屼娇鐢?/p>
56 kbps
璋冨埗瑙ｈ皟鍣ㄥ懠鍙湪鍚屼竴澶фゼ鍐呯殑璁＄畻鏈哄垯鏈変綆甯﹀鍜岃緝浣庣殑
鏃跺欢銆?/p>
4. Besides bandwidth and latency, what other parameter is needed to give a good
characterization of the quality of service offered by a network used for digitized
voice traffic?(M)
澹伴煶鐨勪紶杈撻渶瑕佺浉搴旂殑鍥哄畾鏃堕棿锛屽洜姝ょ綉缁滄椂闅欐暟閲忔槸寰堥噸瑕佺殑銆備紶杈撴椂闂村彲浠?/p>
鐢ㄦ爣鍑嗗亸宸柟寮忚〃绀恒�傚疄闄呬笂锛岀煭寤惰繜浣嗘槸澶у彉鍖栨�ф瘮鏇撮暱鐨勫欢杩熷拰浣庡彉鍖栨�ф洿
绯熴�?/p>
6. A client-server system uses a satellite network, with the satellite at a height of
40,000 km. What is the best-case delay in response to a request?(E)
鐢变簬璇锋眰鍜屽簲绛旈兘蹇呴』閫氳繃鍗槦锛屽洜姝や紶杈撴�昏矾寰勯暱搴︿负
160,000
鍗冪背銆傚湪绌烘皵
鍜岀湡绌轰腑鐨勫厜閫熶负
300
锛?/p>
000
鍏噷
/
绉掞紝
鍥犳鏈�浣崇殑浼犳挱寤惰繜涓?/p>
160,000/300
锛?/p>
000
绉掞紝绾?/p>
533 msec
銆?/p>
8. A collection of five routers is to be connected in a point-to-point subnet.
Between each pair of routers, the designers may put a high-speed line, a