2023年链路层试题

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Ḅᨬᜧᔢ3OMb/s஺ᵫ89ᘤ3◞ᩭḄ3"#$%;<ᨵ()*+.〈0᦮"
Ḅᨬᜧᔢ10Mb/s஺23.?@ABC.DEFGHDEḄ#$2ᣚ+ḄJK஺ABC.LᑖNHOABC.ᑖN2ᣚ+C.-ᙠ2ᣚ+QRᙠS9TUVWᑖNXY(D☢ᦈ8\]᦮ᙢAB_஺ᙠ᦮"ᑖNᑮa2ᣚ+XYWSb4JcdḄefghiᦈ8ᙠ2ᣚ+jklABC.-mh"-mnolpḄqᑮq-m஺h"-mḄU▲-L/R,hsLᑖNḄotRᐭvTḄVWw᳛஺GH2ᣚyᵨGH2ᣚᎷ᝞ᙠ᦮"ᑖNᑮaXYb4Jcdᙠ}ᑖNḄ~ᑖᑮaḄ,-:2ᣚ+&#QRVW}ᑖNḄY☢ᑖ஺LᯠᙠSvT.〈ᑖNXYᑖN%ᒹḄᙢᙬḄᑖ(D☢ᑮa஺pḄᩭHOGH2ᣚLSvTd-ᑖNᙠC.XY3◤⌕]ᐰAB&WSC.S஺LWSb4JᨵᑖN-ABC.FGH2ᣚXᨵḄJK஺h"2ᣚᢈ;ᨵLWSb4dḄ-ᨵJK஺24."#$2ᣚ+BFTᵫᘤR2ᙠ(᝞ᡠ¡஺*+Aᔣ*+H.〈ᦪ¤0FI஺HO#$2ᣚ+B~cᡂF2஺¦HOTᵫᘤR~cᡂF3஺§ᑏSF1ஹF2ஹF3%ḄªḄMACᙢᙬஹ«MACᙢᙬஹḄIPᙢᙬஹ«IPᙢᙬ¬஺*+AFH

14##$2ᣚ+BFTᵫᘤRḄᨵᐵᙢᙬ᪗°ᙠ%஺F1:(ḄMACᙢᙬஹ«MACᙢᙬFḄIPᙢᙬஹ«IPᙢᙬ)=(W,P,Y,Q);F2:(W,P,Y,Q);F3:(X,T,Y,Q)25.g⊤aᨵ´"µᑖKᙠ"
U\¶ᵨ᫑B1FB2ᩭ஺·("᫑¸ᨵ"(1F2)஺ᙠ(QR"᫑%ḄC.⊤¸dḄ஺#~ᨵ#gᔜµᔣᐸºḄµ.〈lᦪ¤0A.〈»E,C.〈»B,D.〈»C,B.〈»A஺¼½ᨵᐵᦪ¤¾ᑏᙠg⊤%஺᫑BiḄC.⊤᫑¿ḄC.⊤.〈Ḅ0᫑BiḄÀÁ᫑ÂḄÀÁᙢᙬqᙢᙬqA-*EA1A1C.ᑏᐭC.⊤C.ᑏᐭC.⊤C-BC2C1C.ᑏᐭC.⊤C.ᑏᐭC.⊤D-CD2D2ᑏᐭC.⊤ÃÄ3C.C.ᑏᐭC.⊤B—AB1ᑏᐭC.⊤ÃÄ3C.Å3ᑮh"026.ᨵ10"µᑮ#$U•¼ÇÈ#giefg·("µᡠ<ÉᑮḄÊË஺(1)10"µ¸ᑮ("10Mbit/s#$89ᘤÌ(2)10"µ¸ᑮ("100Mbit/s#$89ᘤ;

15
310"µ¸ᑮ("10Mbit/s#$2ᣚ+஺ÎᎷÏÐᵨ᳛100%஺ª1·"µÑᙳÉᑮ1Mbit/sÊË̪2·"µÑᙳÉᑮ10Mbit/sÊË̪3·"µ&Óᓰ10Mbit/sÊË27.ᙠÕ9
%3?ᜧAᵫ,23ᡈᐸD<᡾&EFGḄHḄI;!JKᙠ〈ᦪ⌕!LMNᦈ&ᑮ!ᑣ01R஺"ᙠ#$ᨵTU!#VW᧕2345!X8Y23NEZN45ᑮ601R஺"Ꮇ᝞8Y&23!ᙠᨵTU]ᔩ᳛`abcḄ!JKdᨵ⌕☠ᦪ஺29.ᙠ802.11efghijḄkk◞Ḅᵨ⌶`()*᪗pefghijḄkk◞`q&rstḄ〈uᐜw஺xuᐜwyzḄNk{|!cuᐜwyzḄNk{i஺Lcuᐜw}dᩭZ〈"ᐸDHḄxuᐜw〈ᑮ!ᑣ᝱J"cuᐜw%E〈q஺|kk◞!ᵨᩭᑖ◞,Ḅᔜ!&FcuᐜwḄᡠᡭ஺

1630.2MbpsḄT!ij1km,j20m/ms,ᑖᜧ100B,ᶍ)ᜧ஺Ꮇ᝞ᵨᩎ¢-y./!¤ᨬᜧ¦ᔢ᳛(▭ªḄᨬx«ᙳᦪ᳛)`®¯(8⍝°ᵨ᳛`®¯(Ꮇ᝞ᵨ±²³´./!⌕µªᡂᨬx¦ᔢ᳛!〈³´ᨬ`®¯()*〈·´X100)/(2XIO஺)=0º,¼·½(1000m)/(20m/ms)=50ms1〈¾yz1RTT!ᯠÀ--஺ᕜÂij=0.4ms+50msX2=100.4ms,1ᕜÂᑁ〈1஺▭ᦪ᳛=(8X100b/X1)/100.4ms=7968bps஺8⍝°ᵨ᳛=7968bps/(2X106)bps=0.3984%.Ꮇ᝞ᵨ±²³´./!ÄÅ〈ḄḄᦪ*(ᕜÂij)/(ᑖ〈Nk)=100.4ms/0.4ms=251஺ᡠ#!〈³´ᨬ251஺31.ᎷfÇÈ8⍝Ḅᦪ᳛100kbps,ÇÈ8⍝ḄᓫÊ(ᓽÌ〈ÍÎÇÈᑮªI;)N·250ms,Ïᦪiᙳ2023b!ᶍ]ṹஹÒiஹ✌ÔÕÖ×Nky├!ªᡂḄᨬᜧᦔ᳛!ḄÚÛY®¯Ü(KN8⍝°ᵨ᳛`®¯()*RTT=250X2ms=0.5s31Ḅ〈Nk=2023b/100kbpsÝ2()Þ1஺__஺1〈¾ÍÎ1ᓫÊ·ᑮªI;!ÍÎ1ᓫÊ·〈ᦈᑮ)!Ì"#àÅ〈!áâḄãä`KN³´8åæ〈¾ᡈ}dᨵ〈¾஺Ꮇç³´èy,x,é(2023bitXx)/(100kb/s)=2°X103J+RTTê20Xl°-3lo.5s=l.52sox=26஺L⌕ëᨬᜧ8⍝°ᵨ᳛!³´è`26ᓽ!ᙠKᩩíî!#&kᙢ〈!ᡠ#〈᳛ᢝᙠ100kbpsoᵫ,16<26<32,ḄÚÛY5Ü஺ᙠñᵨ⌨N./Ḅãäî!ᨬᜧ³´è`

1731,ᜧ,26,#&kᙢ〈!KN8⍝°ᵨ᳛`100%஺32.ñᵨ164KbpsḄ┯ÇÈÍ⍝õöᑮöḄ·`270ms
〈512Ò⁚Ḅᦪõᙠᔣù!"ᙠÀᔣúV|Ḅ஺,³´ᜧ1ஹ7ஹ15Õ127Ḅᨬᜧ¦ᔢ᳛`®¯()*ñᵨÇÈ8⍝!öᑮöḄ·`270ms,#64Kbps〈!512Ò⁚iḄᦪᓰÍ⍝ḄNk`512X8
/64000=64X10-3s,ᓽ64ms஺ᵨt=0⊤ªýNk!þᙠt=64msN!ÿ1
〈t=64+270=334ms1ᐰᑮḄ
ᶍt=334+270=604msᐰᑮ
〈஺ᕜ"#$604ms,◤⌕'(ᜧ*+604/64,9-./0ᢝ2⍝45஺6$'(71,8604ms9
〈4096:;ᔢ᳛E096/0.604-6781bps,>+6.8Kbps஺6$'(77,;ᔢ᳛=6781X7=47467bps,>+47.5Kbps஺6$'(7@A9BC15D127ḄEF;ᔢ᳛ᡂᐰH᳛64Kbpso