计算机科学引论课后习题.doc

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1、0WillardP311.DescribehowtheInternetandtheWebstarted.A:Theinternetwaslaunchedin1969whentheUnitedStatesfundedaprojectthatdevelopedanationalcomputernetworkcalledAdvancedResearchProjectAgencyNetwork(ARPANET).TheWebwasintroducedin1992attheCenterforEuropeanNuclearresearch(CERN)inSwitzer

2、land.Fromtheseearlyresearchbeginnings,theInternetandtheWebhaveevolvedintooneofthemostpowerfultoolsofthe21stcentury.2.WhatisthedifferencebetweentheInternetandtheWeb?A:TheInternetistheactualphysicalnetwork.Itismadeupofwires,cables,andsatellites.AndtheWebisamultimediainterfacetothere

3、sourcesavailableontheInternet.3.ListanddescribefiveofthemostcommonusesoftheInternetandtheWeb.A:Themostcommonusesarethefollowing:CommunicatingisbyfarthemostpopularInternetactivity.Shoppingisoneofthefastest-growingInternetapplications.Searchingforinformationhasneverbeenmoreconvenien

4、t.Entertainmentoptionsarenearlyendless.Educationore-learningisanotherrapidlyemergingWebapplication.P331.WhatisthefunctionofanISP?DescribetwotypesofISPs.A:TheISPareInternetserviceprovider.ItisconnectedtotheInternetandprovideapathorconnectionforindividualstoaccesstheInternet.Thetwot

5、ypesofISPsareNationalserviceprovidersandwirelessserviceproviders.Nationalserviceprovidersprovideaccessthroughstandardtelephoneorcableconnections.UserscanaccesstheInternetfromalmostanywherewithinthecountryforastandardfeewithoutincurringlong-distancetelephonecharges.Wirelessservicep

6、rovidersdonotusetelephoneorcablelines.TheyprovideInternetconnectionsforcomputerswithwirelessmodemsandawidearrayofwirelessdevices.2.Whatisthefunctionofabrowser?A:BrowsersareprogramsthatprovideaccesstoWebresources.3.WhatareURLs,HTML,Webpages,hyperlinks,applets,andJava?A:Forbrowserst

7、oconnecttoresources,thelocationoraddressoftheresourcesmustbespecified.TheseaddressarecalledURLsTheHTMLisHypertextMarkupLanguagecommandstointerpretstheweb.Thewebpagesarepresentinformationaboutthesitealongwithreferencesandhyperlinkorlink.Thehyperlinksarethelinksthatconnecttootherdoc

8、umentscontainingrelatedinformatio