谢希仁计算机网络第七版课后答案完整版

1-011-021231-031231-041-05APPANETTCP/IPInternetISPInternetISP1-061(InternetDraft)RFC2(ProposedStandard)RFC3(DraftStandard)4(InternetStandard)1-07internetInternet1internet2InternetTCP/IP1-081WANInternet234PAN1-091-10xbitkdsb(b/s)s(s)p(bit)kkd+x/b+s,kd+(x/p)*(p/b)+(k-1)*(p/b)(k-1)*(p/b)K(k-1)s(k-1)*(p/b)xp,1-11x(p+h)(bit),phpkb(b/s)p1-12DD=kd+(x/p)*((p+h)/b)+(k-1)*(p+h)/bDp0p=[(xh)/(k-1)]^0.51-12;1-131-14RTT1-1590%UDD0U=90%;D=D0/(1-U)----D/D0=10101-161-171000km2108m/s1107bit,100kb/s2103bit,1Gb/s1ts=107/105=100stp=106/(2108)=0.005s2ts=103/109=1stp=106/(2108)=0.005s1-182108m/s.L110cm2100m3100km45000km1Mb/s10Gb/s11Mb/s:=0.1/(2108)=510-10=510-101106=510-41Gb/s:=510-101109=510-121Mb/s:=100/(2108)=510-7=510-71106=510-11Gb/s:=510-71109=5102(3)1Mb/s:=100000/(2108)=510-4=510-41106=51021Gb/s:=510-41109=5105(4)1Mb/s:=5000000/(2108)=2.510-2=2.510-21106=51041Gb/s:=2.510-21109=51071-1910020TCP20IP1810001100/100+20+20+18=63.3%21000/1000+20+20+18=94.5%1-201-2112312OSI1-221231-2331-24OSITCP/IP0frame1-251-26-(entity)(client)(server):,,,.:,.:.:.SAP,.1-27everythingoverIPIPovereverthingTCP/IPeverythingoveripIPipovereverything2-011231OSIOSI22-022-032-04(code)2-0512342-06///s2-0720000/16b/s?C=R*Log216=20000b/s*4=80000b/s2-083KHz64kb/sC=Wlog21+S/N(b/s)W=3khzC=64khz----S/N=64.2dB2-093100Hz35Kb////C=Wlog2(1+S/N)b/s-SN1=2*C1/W-1=2*35000/3100-1SN2=2*C2/W-1=2*1.6*C1/w-1=2*1.6*35000/3100-1SN2/SN1=100100C3=Wlong21+SN3=Wlog21+10*SN2C3/C2=18.5%S/N1018.5%2-10STP(ShieldedTwistedPair)UTP(UnshieldedTwistedPair)50W75W//2-110.7dB/km(1kHz)20dB100=20/0.7=28.6km20/100=0.2db2-121200nm1400nm1400nm1600nm2*10e8m/s.V=L*F-F=V/L--B=F2-F1=V/L1-V/L21200nm1400nm=23.8THZ1400nm1600nm=17.86THZ2-132-14FDM,TDM,STDM,WDM,DWDM,CDMA,SONET,SDH,STM-1,OC-48.FDM(frequencydivisionmultiplexing)TDM(TimeDivisionMultiplexing)STDM(StatisticTimeDivisionMultiplexing)WDM(WaveDivisionMultiplexing)DWDM(DenseWaveDivisionMultiplexing)CDMA(CodeWaveDivisionMultiplexing)SONET(SynchronousOpticalNetwork)SDH(SynchronousDigitalHierarchy)STM-1(SynchronousTransferModule)1OC-48(OpticalCarrier)482-15CDMA2-1644A11111111B11111111C11111111D11111111S1131131101S?A=113113118=1A1S?B=113113118=1B0S?C=113113118=0CS?D=113113118=1D12-17xDSLHFCFTTxxDSLHFC450MHz750MHzHFCFTTxx2-18ASDL1MHzDMT3-01()()??3-02?.3-03??TCP/IPOSI3-04()3-053-06PPPPPPPPPPPPA0xFFC0x03PPPPPPHDLCPPPPPPPPP3-071101011011CRCPX=X4+X+11010CRC110101101100001001111101110.CRC3-08101110CRCDPX=X3+1101110000100110113-09PPP7D5EFE277D5D7D5D657D5E7D5EFE277D5D7D5D657D5E7EFE277D7D657D3-10PPP0110111111111100PPP000111011111011111011001101111111111000110111110111110000001110111110111110110000111011111111111103-111233-12PPPPPPISP3-13LAN1210m~10km12OSI/RM33-14ASIC3-15DIXEthernetV2DIXEthernetV2IEEE802.33-1610Mb/s/10MB/s20M3-17LLCTCP/IPDIXEthernetV2802.3802LLC802.23-1810BASE-T10BASET10BASE-T1010MB/sBASET10BASE-T100m3-19CSMA/CDTDMTDMCSMA/CD3-201kmCSMA/CD1Gb/s200000km/s1km1/200000=510CSMA/CD10Gb/s1010*10^-6/1*10^-9=10000,1000012503-2110010Mb/s100103-22CSMA/CD10Mb/sr=100100Mb/s10mb/s51.210051.2*100=5.12ms100mb/s5.121005.12*100=5123-233-3CSMA/CD3-24AB10Mb/s225AABAABAABMACt=0At=64+8*8=576At=225BABt=224AAAB3-25ABt=0t=255ABt=255+48=273ABCSMA/CDrABrA=0rB=1ABABABBt=0ABT1=225,ABtauT2=273,ABT1+48T3=594,AT2+Tau+rA*Tau+96T4=785BT4+T2+Tau+Rb*TauBT5=881T5=T4+96A819BBB8813-26ii=123,..123Iipi0.50.250.125.I=1.6373-2780%20%3-281011010Mb/s210100Mb/s31010Mb/s:11010Mb/s10mbs210100mb/s100mbs31010mb/s10mbs3-2910Mb/s100Mb/s1Gb/S10Gb/sa100mb/s100m9.60.96100m645121010mb/s100mb/s1Gb/skm3-30VLAN4VLAN(tag)3-31MACMAC3-323-35B1B212AECBDCBA3-2B1B2B1B2AA1A1CC2C1DD2D2BB13-33;1.VirtualCircuit2.3.(relay)(repeater)(bridge)(router)(brouter)(gateway)4.IPARPRARPICMPIPIPTCP/IPIPARPIPRARPIPICMPIPIGMP5.IPIPABCDE5;net-idhost-idnet-id12300host-id321441IPIPIPIP2IPIPnet-id(multihomedhost)IPIP(3)net-id(4)net-id6.IP4-21Abit,271280127126112624bit,2241677721601167772142B14bit21416384128.012712828256128128.0~~128.2552561638416384/256=64128+64=192191.25516bit,2166553601655343C21bit,2212097152192.0.0192192.0.0~~192.255.255256*256=6553620971522097152/65536=32192+32=224223.255.2558bit,28256012547.IPIP32MACIP8.IP9.1255.255.255.0AAIP824255.255.255.08168BBIP1616255.255.255.01688CC2255.255.255.248255.255.255.24811111111.11111111.11111111.11111000.(2^3)=62981063ABsubnet-id16181A11111111111111111111111100000000161255.255.255.0B1111111111111111111111110000000081255.255.255.04B255.255.240.024010=128+64+32+1610=111100002Host-id4+8=122^12-2=4096-2=409411111111.11111111.11110000.000000002^12-2(5)A255.255.0.25510111111111111110000000011111111(6)IPC2.2F.14.81IPC22F1481--(12*16+2).(2*16+15).(16+4).(8*16+1)---194.47.20.129C22F1481---11000010.00101111.00010100.10000001C(7)C.CIP32,24,8.,8,,,.10.IP1128.36.199.3221.12.240.173183.194.76.2534192.12.69.248589.3.0.16200.3.6.2(2)(5)A,(1)(3)B,(4)(6)C.11.IP12.IPCRCIPCRC13.IPIP4502810041710.12.14.512.6.7.910001010000000000000000-00011100000000000000000100000000-000000000000010000010001xxxxxxxxxxxxxxxx0000101000001100000011100000010100001100000001100000011100001001XOR011101000100111010001011