Chapter1
1-11.Whataretworeasonsforusinglayeredprotocols?
(
璇疯鍑轰娇鐢ㄥ垎灞傚崗璁殑涓や釜鐞嗙敱
)
绛旓細閫氳繃鍗忚鍒嗗眰鍙互鎶婅璁￠棶棰樺垝鍒嗘垚杈冨皬鐨勬槗浜庡鐞嗙殑鐗囨銆傚垎灞傛剰鍛崇潃
鏌愪竴灞傜殑鍗忚鐨勬敼鍙樹笉浼氬奖鍝嶉珮灞傛垨浣庡眰鐨勫崗璁�?/p>
1-13.Whatistheprincipaldifferencebetweenconnectionlesscommunicationan
dconnection-orientedcommunication?
(
鍦ㄦ棤杩炴帴閫氫俊鍜岄潰鍚戣繛鎺ョ殑閫氫俊涓よ�呬箣闂达紝鏈�涓昏鐨勫尯鍒槸浠�涔堬紵
)
绛旓細涓昏鐨勫尯鍒湁涓ゆ潯銆?/p>
鍏朵竴锛氶潰鍚戣繛鎺ラ�氫俊鍒嗕负涓変釜闃舵锛岀涓�鏄缓绔嬭繛鎺ワ紝鍦ㄦ闃舵锛屽彂鍑轰竴涓缓
绔嬭繛鎺ョ殑璇锋眰銆?/p>
鍙湁鍦ㄨ繛鎺ユ垚鍔熷缓绔嬩箣鍚庯紝
鎵嶈兘寮�濮嬫暟鎹紶杈擄紝
杩欐槸绗簩闃舵銆?/p>
鎺ョ潃锛屽綋鏁版嵁浼犺緭瀹屾瘯锛屽繀椤婚噴鏀捐繛鎺ャ�傝�屾棤杩炴帴閫氫俊娌℃湁杩欎箞澶氶樁娈碉紝瀹冪洿
鎺ヨ繘琛屾暟鎹紶杈撱�?/p>
鍏朵簩锛氶潰鍚戣繛鎺ョ殑閫氫俊鍏锋湁鏁版嵁鐨勪繚搴忔�э紝鑰屾棤杩炴帴鐨勯�氫俊涓嶈兘淇濊瘉鎺ユ敹鏁版嵁
鐨勯『搴忎笌鍙戦�佹暟鎹殑椤哄簭涓�鑷淬�?/p>
1-20.Asystemhasann-layerprotocolhierarchy.Applicationsgeneratemessage
soflengthMbytes.Ateachofthelayers,anh-byteheaderisadded.Whatfractiono
fthenetworkbandwidthisfilledwithheaders?
(
涓�涓郴缁熸湁
n
灞傚崗璁殑灞傛缁撴瀯銆傚簲鐢ㄧ▼搴忎骇鐢熺殑娑堟伅鐨勯暱搴︿负
M
瀛楄妭銆?
鍦ㄦ瘡涓�灞備笂闇�瑕佸姞涓婁竴涓?/p>
h
瀛楄妭鐨勫ご銆?/p>
璇烽棶锛?/p>
杩欎簺澶撮渶瑕佸崰鐢ㄥ灏戞瘮渚嬬殑缃戠粶甯?/p>
瀹?/p>
)
绛旓細
hn/(hn+m)*100%
1-28.Animageis1024x768pixelswith3bytes/pixel.Assumetheimageisuncompre
ssed.Howlongdoesittaketotransmititovera56-kbpsmodemchannel?Overa1-Mbp
scablemodem?Overa10-MbpsEthernet?Over100-MbpsEthernet?
(
涓�骞呭浘鍍忕殑鍒嗚鲸鐜囦负
1024x768
鍍忕礌锛屾瘡涓儚绱犵敤
3
瀛楄妭鏉ヨ〃绀恒�傚亣璁捐鍥?
鍍忔病鏈夎鍘嬬缉銆傝闂紝閫氳繃
56kbps
鐨勮皟鍒惰В璋冨櫒淇￠亾鏉ヤ紶杈撹繖骞呭浘鍍忛渶瑕佸闀?/p>
鏃堕棿锛熼�氳繃
1Mbps
鐨勭數缂嗚皟鍒惰В璋冨櫒鍛紵閫氳繃
10Mbps
鐨勪互澶綉鍛紵閫氳繃
100Mbps
鐨勪互澶綉鍛?/p>
?)
绛?/p>
锛?/p>
Theimageis1024*768*3bytesor2359296bytes.Thisis18874368bit.At56,000bi
ts/sec,ittakesabout337.042sec.At1,000,000bits/sec,ittakesabout18.874
sec.At10,000,000bits/sec,ittakesabout1.887sec.At100,000,000bits/sec,
ittakesabout0.189sec.
Chapter2
2-2.Anoiseless4-kHzchannelissampledevery1msec.Whatisthemaximumdatarat
e?
(
涓�鏉℃棤鍣０
4kHz
淇￠亾鎸夌収姣?/p>
1ms
涓�娆¤繘琛岄噰鏍凤紝
璇烽棶鏈�澶ф暟鎹紶杈撶巼鏄
灏戯紵
)
绛旓細鏃犲櫔澹颁俊閬撴渶澶ф暟鎹紶杈撶巼鍏紡锛氭渶澶ф暟鎹紶杈撶巼
=2Hlog2Vb/s
銆傚洜姝ゆ渶澶?/p>
鏁版嵁浼犺緭鐜囧喅瀹氫簬姣忔閲囨牱鎵�浜х敓鐨勬瘮鐗规暟锛屽鏋滄瘡娆￠噰鏍蜂骇鐢?/p>
16bits
锛岄偅涔?/p>
鏁版嵁浼犺緭鐜囧彲杈?/p>
128kbps
锛涘鏋滄瘡娆￠噰鏍蜂骇鐢?/p>
1024bits
锛岄偅涔堝彲杈?/p>
8.2Mbps
銆傛敞
鎰忚繖鏄鏃犲櫔澹颁俊閬撹�岃█鐨勶紝瀹為檯淇￠亾鎬绘槸鏈夊櫔澹扮殑锛屽叾鏈�澶ф暟鎹紶杈撶巼鐢遍