Networking Lab2

Khoa Cng Ngh Thng Tin i Hc Bch Khoa Tp.HCM

BI THC HNH S 2H tn sinh vin:........................................................... Nhm: ........... MSSV:................................................... Sinh vin np bi qua Sakai: www.cse.hcmut.edu.vn/portal (nhn vo link n thng trang mn hc ) I.Mc tiu Hiu bit v Ethernet. Hiu bit v ARP. Hiu bit v ICMP. II.Cc bc thc hin1.Hiu

Khi ng trnh duyt IE, loi b cc thng tin trong cache(Tools-> Internet Options-> Delete Files),v loi b vic s dng proxy server nu c th (Tools ->Internet Options -> Connections -> LAN Settings) Khi ng li phn mm Ethereal, bt u tin trnh bt gi. Nhp URL: http://www.dit.hcmut.edu.vn/ vo trnh duyt IE, trang web hin th. Dng li tin trnh bt gi trn Ethereal. Chn Frame cha thng ip HTTP GET. Xem xt thng tin (t chi tit n tng qut) trong Frame trn v tr li cc cu hi sau: - Kch thc ca Frame (bytes): ....................................................................................................................................... - a ch Ethernet 48-bit ca my tnh bn ang s dng: ....................................................................................................................................... - a ch ch 48-bit trong Ethernet frame l g : ....................................................................................................................................... - a ch ch trn l a ch ca my tnh no(www.dit.hcmut,edu.vn/default gateway): ....................................................................................................................................... - Cho bit gi tr thp lc phn ca trng Frame type (2 bytes): ....................................................................................................................................... - Cho bit c bao nhiu byte k t k t ASCII G trong t kha GET (chiu di thng ip tng ng dng) ....................................................................................................................................... - Hy cho bit nh dng ca Ethernet Frame trn(xem li l thuyt chng 3 v kim chng bng thc nghim). ....................................................................................................................................... Tng t xem xt thng tin (t chi tit n tng qut) trong Frame cha thng ip HTTP response v tr li cc cu hi sau: - Kch thc ca Frame (bytes): ....................................................................................................................................... - a ch ch 48-bit c phi l a ch Ethernet my tnh ca bn hay khng ? ....................................................................................................................................... - a ch ngun 48-bit trong Ethernet frame: ....................................................................................................................................... - a ch ngun trn l a ch ca my tnh no (www.dit.hcmut,edu.vn/default gateway): .................................................................................................................................. ..... - Cho bit gi tr thp lc phn ca trng Frame type: ....................................................................................................................................... - Cho bit c bao nhiu byte k t k t ASCII O trong OK - .......................................................................................................................................2.Hiu

bit v Ethernet

Xem li l thuyt chng 4, v cc URL sau nm cc thng tin v ARP. ftp://ftp.rfc-editor.org/innotes/std/std37.txt

bit ARP (Address Resolution Protocol)

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M DOS prompt, thc hin lnh arp,lnh ny hin th cc thnh phn ca ARP cache trn my tnh ca bn. Cho bit cc thnh phn ca ARP cache trn my tnh ca bn v ngha ca tng ct trong ARP cache. ................................................................................................................................................... Lm ti ARP cache bng lnh arp d * Khi ng trnh duyt v loi b cc thng tin trong cache. Khi ng li phn mm Ethereal, bt u tin trnh bt gi. Nhp URL: http://www.dit.hcmut.edu.vn/ vo trnh duyt IE, trang web hin th. Dng li tin trnh bt gi trn Etherea, lc cc thng ip vi arp. Cho bit kt qu trn Ethereal sau khi lc thng ip vi arp. Xem xt thng tin 02 Frame thuc v protocol ARP v tr li cc cu hi sau: - Gi tr thp lc phn ca a ch ngun v ch trong Ethernet Frame bao gm thng ip ARP request l g: ....................................................................................................................................... Gi tr ca cc trng trong Ethernet Frame bao gm thng ip ARP request l g: ....................................................................................................................................... - Tm Ethernet Frame bao gm thng ip ARP reply, cho bit gi tr thp lc phn ca a ch ngun v ch l a ch ca my tnh no : ....................................................................................................................................... - Gi tr ca cc trng trong Ethernet Frame bao gm thng ip ARP reply l g: .......................................................................................................................................3.Hiu

http://www.erg.abdn.ac.uk/users/gorry/course/inet-pages/arp.html

bit v ICMP

a.ICMP v ping - Khi ng li phn mm Ethereal, bt u tin trnh bt gi. - M mt DOS prompt v thc hin lnh ping n 10 www.hcmut.edu.vn - Sau khi lnh ping kt thc, dng li tin trnh bt gi trn Ethereal. lc cc thng ip vi icmp. - Cho bit mn hnh thc hin lnh ping trn. - Cho bit kt qu trn Ethereal sau khi lc thng ip vi icmp. - Xem xt thng tin (t chi tit n tng qut) trong cc gi ping trn v tr li cc cu hi sau: a ch IP my tnh ca bn: ....................................................................................................................................... a ch IP ca website www.hcmut.edu.vn ....................................................................................................................................... V sao mi ICMP packet khng c ch s port ngun v ch ? ....................................................................................................................................... Xem xt mt ICMP packet request, cho bit nh dng ca packet ny. ....................................................................................................................................... Xem xt mt ICMP packet reply, cho bit nh dng ca packet ny. ....................................................................................................................................... b.ICMP v tracert - Khi ng li phn mm Ethereal, bt u tin trnh bt gi. - M mt DOS prompt v thc hin lnh tracert www.dit.hcmut.edu.vn - Sau khi lnh ping kt thc, dng li tin trnh bt gi trn Ethereal. Lc cc thng ip vi icmp. - Xem xt thng tin (t chi tit n tng qut) trong cc gi icmp trn v tr li cc cu hi sau: Cho bit a ch IP ca default gateway: ....................................................................................................................................... Cho bit a ch IP ca my tnh c tn l www.dit.hcmut.edu.vn : ....................................................................................................................................... Cho bit s khc nhau gia gi ICMP ping reply v gi ICMP ping request :

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....................................................................................................................................... Pht tho ng i t my tnh ca bn n www.dit.hcmut.edu.vn : .......................................................................................................................................

--HT-

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Networking Lab2