计算机网络实验Word文档格式.docx

计算机网络实验Word文档格式.docx

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don’tyetbeginpacketcapture）.Enter“http”（justtheletters,notthequotation

marks）inthedisplay-filter-specificationwindow,sothatonlycapturedHTTP

messageswillbedisplayedlaterinthepacket-listingwindow.（We’reonly

interestedintheHTTPprotocolhere,anddon’twanttoseetheclutterofall

capturedpackets）.

3.Waitabitmorethanoneminute（we’llseewhyshortly）,andthenbegin

Wiresharkpacketcapture.

4.Enterthefollowingtoyourbrowser

http:

//gaia.cs.umass.edu/wireshark-labs/HTTP-wireshark-file1.html

Yourbrowsershoulddisplaytheverysimple,one-lineHTMLfile.

5.StopWiresharkpacketcapture.

实验截图如下：

1.IsyourbrowserrunningHTTPversion1.0or1.1?

WhatversionofHTTPistheserverrunning?

我的浏览器上运行的HTTP版本是1.1，在版本为的HTTP服务器上运行。

2.Whatlanguages（ifany）doesyourbrowserindicatethatitcanaccepttothe

server?

表明可以接受的语言是：

3.WhatistheIPaddressofyourcomputer?

Ofthegaia.cs.umass.eduserver?

我的计算机的IP地址是：

10.2.137.18，gaia.cs.umass.edu服务器是：

128.119.245.12。

4.Whatisthestatuscodereturnedfromtheservertoyourbrowser?

5.WhenwastheHTMLfilethatyouareretrievinglastmodifiedattheserver?

6.Howmanybytesofcontentarebeingreturnedtoyourbrowser?

7.Byinspectingtherawdatainthepacketcontentwindow,doyouseeanyheaders

withinthedatathatarenotdisplayedinthepacket-listingwindow?

Ifso,name

one

以下网页可得：

Congratulations.You'

vedownloadedthefilehttp:

//gaia.cs.umass.edu/wireshark-labs/HTTP-wireshark-file1.html!

2.TheHTTPCONDITIONALGET/responseinteraction

•StartuptheWiresharkpacketsniffer

•EnterthefollowingURLintoyourbrowser

//gaia.cs.umass.edu/wireshark-labs/HTTP-wireshark-file2.html

Yourbrowsershoulddisplayaverysimplefive-lineHTMLfile.

•QuicklyenterthesameURLintoyourbrowseragain（orsimplyselecttherefresh

buttononyourbrowser）

•StopWiresharkpacketcapture,andenter“http”inthedisplay-filter-specification

window,sothatonlycapturedHTTPmessageswillbedisplayedlaterinthe

packet-listingwindow.

•（Note:

IfyouareunabletorunWiresharkonalivenetworkconnection,youcan

usethehttp-ethereal-trace-2packettracetoanswerthequestionsbelow;

see

footnote1.Thistracefilewasgatheredwhileperformingthestepsaboveonone

oftheauthor’scomputers.）

8.InspectthecontentsofthefirstHTTPGETrequestfromyourbrowsertothe

server.Doyouseean“IF-MODIFIED-SINCE”lineintheHTTPGET?

没有看到。

9.Inspectthecontentsoftheserverresponse.Didtheserverexplicitlyreturnthe

contentsofthefile?

Howcanyoutell?

10.NowinspectthecontentsofthesecondHTTPGETrequestfromyourbrowserto

theserver.Doyouseean“IF-MODIFIED-SINCE:

”lineintheHTTPGET?

If

so,whatinformationfollowsthe“IF-MODIFIED-SINCE:

”header?

有，

11.WhatistheHTTPstatuscodeandphrasereturnedfromtheserverinresponseto

thissecondHTTPGET?

Didtheserverexplicitlyreturnthecontentsofthefile?

Explain.

304notmodified

Cache里已有不会再返回内容

3.RetrievingLongDocuments

Inourexamplesthusfar,thedocumentsretrievedhavebeensimpleandshortHTML

files.Let’snextseewhathappenswhenwedownloadalongHTMLfile.Dothe

following:

•Startupyourwebbrowser,andmakesureyourbrowser’scacheiscleared,as

discussedabove.

//gaia.cs.umass.edu/wireshark-labs/HTTP-wireshark-file3.html

YourbrowsershoulddisplaytheratherlengthyUSBillofRights.

window,sothatonlycapturedHTTPmessageswillbedisplayed.

usethehttp-ethereal-trace-3packettracetoanswerthequestionsbelow;

12.HowmanyHTTPGETrequestmessagesweresentbyyourbrowser?

1个

13.Howmanydata-containingTCPsegmentswereneededtocarrythesingleHTTP

response?

4

14.WhatisthestatuscodeandphraseassociatedwiththeresponsetotheHTTPGET

request?

200ok

Favicon.con

15.ArethereanyHTTPstatuslinesinthetransmitteddataassociatedwithaTCP-induced“Continuation”?

No，新版本整合了所有数据包内容

4.HTMLDocumentswithEmbeddedObjects

16.HowmanyHTTPGETrequestmessagesweresentbyyourbrowser?

Towhich

InternetaddressesweretheseGETrequestssent?

三个基本页:

128.119.245.12

图片1:

165.193.140.14

图片

17.Canyoutellwhetheryourbrowserdownloadedthetwoimagesserially,or

whethertheyweredownloadedfromthetwowebsitesinparallel?

Explain.

并行，两个页面是连续请求，并没有等待第一个请求得到回复才继续第二次请求

5HTTPAuthentication

18.Whatistheserver’sresponse（statuscodeandphrase）inresponsetotheinitial

HTTPGETmessagefromyourbrowser?

19.Whenyourbrowser’ssendstheHTTPGETmessageforthesecondtime,what

newfieldisincludedintheHTTPGETmessage?

计算机网络实验报告

WiresharkLab:

HTTP

班级：

2010级计科4班

学号：

41012162

姓名：

汪波