网络层课后习题

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1.
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6212.56.135.0/24212=(11010100)2,56=(00111000)2132=(10000100)2,133=(10000101)2134=(10000110)2135=(10000111)2ᡠàᐳ¤Ḅîïᨵ22ᓽ1101010000111000100001,íᔠḄCIDRᙢᙬᙽS:212.56.132.0/2227.ᨵ):CIDRᙢᙬᙽ208.128/11208.130.28/22»Sᔲᨵôn:ᙢᙬᙽᒹöO÷n:ᙢᙬÍ᝞øᨵ3ᢣ(¦úûᳮᵫ஺208.128/11ḄîïAw11010000100208.130.28/22ḄîïA:1101000010000010000101,ýḄîQ208.128/11ḄîïSnÿḄ,ᡠ208.128/11ᙢᙬᙽᒹ208.130.28/22ᙢᙬᙽ஺28.ᵫᘤR1Ḅᵫ⊤᝞⊤4—12ᡠ"஺⊤4-12⚪4-28ᵫᘤR1Ḅᵫ⊤ᙢᙬ#ᵫᘤ*%Ḅ&'ᙢᙬ()ᙢᙬṹ+/26140.5.12.64180.15.2.5m2/24130.5.8.0190.16.6.2ml/16110.71.0.0m0/16180.15.0.0m2/16196.16.0.0ml2323110.71.4.5mO5678&'9:⌕ḄᵫᘤḄ<*=ᡫ?᪗A7:⌕ḄIPᙢᙬ9*+஺DEFGHḄIJKᢣM஺NOPQRSᫀP38029.8UVWXᨵ58Z[&?ᐸ<*N᝞N4-55"஺LAN2]LAN5^Ḅ_`ᦪᑖcd:91,150,3915.KUVWXᑖfᑮḄIPᙢᙬᙽd30.138.118/23஺5h7i8Z[&Ḅᙢᙬᙽjᒹklmn஺30.138.118/23-^30.138.0111011ᑖf&'lmpJᐜᑖfᙢᙬᦪrsḄlm⚪%tᨵuLAN1^ᨵy8_`?z]{◤⌕38ᙢᙬh}8~ᘤᵨ஺⚪ḄSᨵs?☢h7EḄSᫀSᫀSᫀLANI30.138.119.192/2930.138.118.192/27LAN230.138.119.0/2530.138.118.0/25LAN330.138.118.0/2430.138.119.0/24LAN430.138.119.200/2930.138.118.224/27LAN530.138.119.128/2630,138.118.128/2730.8ᜧᨵ89}8(஺ᑖfᑮḄ&'lm192.77.33/24.Ḅ

7&'Z᝞N4-56"஺ᐳᨵ8Z[&?ᐸḄLAN1-LAN4<*ᑮᵫᘤR1^?R1LAN5ᵫᘤR5<஺R59ᙢḄ}8ḄZ[&LAN6(LAN8[&<஺i8Z[&᪗MḄᦪ¡Z[&^Ḅ_`ᦪ஺5hi8Z[&ᑖf8ᔠ〉Ḅ&'Ḅlm஺PQRSᫀP38031.(ᙢᙬḄ¤8986.32/12ᓛf¦uMᳮᵫ஺(1)86.33.224.123(2)86.79.65.216ª(3)86.58.119.74;(4)86.68.206.154«86.32/12—86.00100000(ᑜ¯^d12°lmuM¡⁚Ḅl4°ᙠlm஺h7Ḅ³8ᙢᙬḄ¡⁚Ḅl4°ᑖcd0010,0100,001190100஺´µ¶ᨵ(1)ᓛfḄ஺32.(ᙢᙬḄ¤8ᙢᙬ2.52.90஺140ᓛf·¦uMᳮᵫ஺(1)0/4ª(2)32/4ª(3)4/6(4)152.0/11lm(1)9ᙢᙬ2.52.90.140ᓛf2.52.90.140—00000010.52.90.1400/4”0000000032/4ߟ001000004/6ߟ0000010080/4”(M01000033.(☢ḄlmḄ¤89ᙢᙬ152.7.77.159»152.31.47.252ᓛf·¦uMᳮᵫ஺(1)152.40/13ª(2)153.40/9ª(3)152.64/12ª(4)152.0/1klm(4)98ᙢᙬᓛf34.(ᑡ#ṹDJḄ&'lmᔜᨵs{°·(I)192.0.0.0ª(2)240.0.0.0ª(3)255.254.0.0ª(4)255.255.255.252஺(1)/2;(2)/4;(3)/II;(4)/30o35.ᙢᙬᙽḄ8ᙢᙬ140.120.84.24/20஺5À8ᙢᙬᙽḄᨬÂᙢᙬ9ᨬᜧᙢᙬ஺ᙢᙬ#ṹÃÄ·ᙢᙬᙽᐳᨵs{8ᙢᙬ·ÅÆs{8CÇᙢᙬ·140.120.84.249140.120.(01010100).24ᨬÂᙢᙬ140.120.(01010000).0/20(80)ᨬᜧᙢᙬ140.12ᨬ(01011111).255/20(95)ᙢᙬᦪ4096ÅÆ168CÇᙢᙬ஺36.ᙢᙬᙽḄ8ᙢᙬ190.87.140.202/29.ÉÊËÌ^⚪஺190.87.140.202/29190.87.140.(11001010)/29ᨬÂᙢᙬ190.87.140.(11001000)/29200ᨬᜧᙢᙬ190.87.140.(11001111)/29207ᙢᙬᦪ8.ÅÆ1/328CÇᙢᙬ஺37.Íᓫ°ᑖfᑮ8ᙢᙬᙽ136.23.12.64/26oÏᙠ◤⌕ÐÑᑜᑖd48᪵ᜧḄÓ&஺5Ô

8(1)i8Ó&Ḅ&'lmᨵsÕ·(2)i8Ó&ᨵs{8ᙢᙬ·(3)i8Ó&ḄᙢᙬÃÄ·(4)i8Ó&Öᑖfh_`×ᵨḄᨬÂᙢᙬ9ᨬᜧᙢᙬÃÄ·(I)i8Ó&lm28°஺(2)i8Ó&Ḅᙢᙬᨵ4°ᶇh_`ᵨ?´µᐳᨵ168ᙢᙬ஺(3)³8Ó&Ḅᙢᙬᙽ8ᙢᙬᙽ136.23.12.64/28,Öᑖfh_`×ᵨḄᨬÂᙢᙬ136.23.12.01000001=136.23.12.65/28ᨬᜧᙢᙬ136.23.12.01001110=136.23.12.78/288ᙢᙬᙽ136.23.12.80/28,Öᑖfh_`×ᵨḄᨬÂᙢᙬ136.23.12.01010001=136.23.12.81/28ᨬᜧᙢᙬ136.23.12.01011110=136.23.12.94/28}8ᙢᙬᙽ136.23.12.96/28,Öᑖfh_`×ᵨḄᨬÂᙢᙬ:136.23.12.01100001=136.23.12.97/28ᨬᜧᙢᙬ136.23.12.01101110=136.23.12.110/28³8ᙢᙬᙽ136.23.12.112/28,Öᑖfh_`×ᵨḄᨬÂᙢᙬ136.23.12.01110001=136.23.12.113/28ᨬᜧᙢᙬ136.23.12.01111110=136.23.12.126/2838.IGP9EGPÇÚÛḄ_⌕ÜcÃÄ·IGPᙠUVWXᑁ×ᵨḄᵫÚÛªßÀᨬàᵫEGPᙠEUVWXâᣩ×ᵨḄᵫÚÛªßÀräᵫ(EåᙌÓ)EGP:çὃ⇋ᐸêë☢Ḅìí?◤⌕sᩩᵫ஺ïðñᵨë☢ÖFÖòឋôÉ⌕஺IGPᑁ&ᐵÚÛ?¶ᐵöUVWXᑁ᝞÷ø〈ᦪúû?üὶ&ᐸêUVWX×ᵨÃÄÚÛþᐵ஺EGP᜜
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11¯@ᵫᘤ°±᝞⊤ᡠµḄ⊤&*ᵫᘤb4¶·0l·1ᑖb§O»¼ḄᵫᘤR2,R3lR4,Áᐳᦈᑮ5Aᑖ,ᐸ{ḄÄ1Pᙢᙬᑖs,(1)128.96.39.10,(2)128.96.40.12,(3)128.96.40.151,(4)192.4.153.17,(5)192.4.153.901ËᑖsÌÍᐸCÎ.Ḅṹ128.96.39.0255.255.255.1280128.96.39.128255.255.255.1281128.96.40.0255.255.255.128R2192.4.153.0255.255.255.192R3*()R4&ᵫ⊤ḄÏÐÑᑣ'{ḄIPᙢᙬÒᵫ⊤a"C⊤⚗ḄÔṹ»Ò᝞Ö×ÖÒ⊤⚗Ḅ{Ḅg»Øᑣᢥ⊤⚗aḄCÎᡠᢣ.ᔲᑣÒ"#⊤⚗ḄÔṹ»Ò᝞*Û᝞Öᡠᨵ⊤⚗ᙳVᓛÞᑣᢥßIᵫ.àáâ⊤a"i⚗ḄÌÍOãb⊤µ&if((Mask[i]&D)==Destination[i])forwardingtoNextHop[i];(1):128.96.39.10&255.255.255.128==128.96.39.0,Ò"Cᩩ⊤⚗ᓛÞᢥCÎᡠᢣ·0.(2)128.96.40.12&255.255.255.128=728.96.40.0,Òåæᩩ⊤⚗VᓛÞÒ"¤ᩩ⊤⚗ᓛÞᢥCÎR2.(3):128.96.40.151&255.255.255.128—128.96.40.128,Òå¤ᩩ⊤⚗VᓛÞç128.96.40.151&255.255.255.192==128.96.40.128,Ò"èᩩ⊤⚗VᓛÞçᨬêᢥßIᵫ⊤⚗ᑮCÎR4.(4)192.4.153.174255.255.255.128—192.4.153.0,Òå¤ᩩ⊤⚗VᓛÞ;192.4.153.17&255.255.255.192—192.4.153.0,Ò"èᩩᓛÞᢥCÎR3.(5):192.4.153.90&255.255.255.128=792.4.153.0,Òå¤ᩩVᓛÞç192.4.153.90&255.255.255.192=192.4.153.64,Ò"èᩩ⊤⚗VᓛÞçᨬêᢥßIᵫ⊤⚗ᑮCÎR4஺1ஹÔṹ255.255.255.0ì⊤jGíîo

12&255.255.255.0bì⊤Crᙢᙬ?EḄÔṹßIðçbì⊤ArᡈBrᙢᙬḄÔṹᓽ23ôᵫᨬ8bilø°àᵫᘤùÐgᵫå24bilø°஺2ஹḄṹ255.255.255.248,248=(11111000),ᓽIPᙢᙬaå29üì⊤g3üì⊤223.ᡠ4ᐳᨵ23ᦪ=23=8,Lᵫᐸa23ôᐰ0ì⊤gḄgᙢᙬ23ôᐰ1ì⊤gḄþᙢᙬᙳVᑖÞ23xᵨᡠ4gÿ
Ḅᦪ=23-2=6.3ஹ!"#$%&ᦪḄA(Ḅṹ()ᵨ+ṹ)(Ꮇ-ᐰ1/ᐰ00ᵨ)(1)2(2)6(3)20(4)62(5)122(6)250(3)20+2=22<25(72ᓽḄᐰ1ᐰ0Ḅ)ᡠᓰᵨ5bit,ᡠ#ᐳ13bit,%ṹ'13(1)19(0,ᓽ255.248.0.0.*+,-(1)255.192.0.0,(2)255.224.0.0,(4)255.252.0.0,(5)255.254.0.0,(6)255.255.0.0.(/012ᨵ5(456ᐸ
᝞9ᡠ;6LAN2

13PLAN3,ᦪ150,(27-2)<150+1<(28-2),ᡠQ8bit,R'N24,ᑖCᙢᙬᙽ30.138.118.0/24.(S24Q0)PLAN2,ᦪ91,(26-2)<91+1<(27-2),ᡠQ7bit,R'N25,ᑖCᙢᙬᙽ30.138.119.0/25.(S24,25Q10)PLAN5,ᦪ15,(24-2)<15+1<(25-2),ᡠQ5bit,R'N27,ᑖCḄᙢᙬᙽ30.138.119.192/27,(S24,25,26,27Q1110)PLAN4,ᦪ3,(22-2)<3+1<(23-2),ᡠQ3bil,R'N29,ᑖCḄᙢᙬᙽ30.138.119.232/29(S24,25,26,27,28,29Q111101)PLAN1,ᦪ3,(22-2)<3+1<(23-2),ᡠQ3bit,R'N29,ᑖCḄᙢᙬᙽ30.138.119.240/29(S24,25,26,27,28,29Q111110)