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1、.Chapter 2 Application Layer1.In a client-server paradigm, a _ program provides services to a (another) _ program.A)client; clientB)client; serverC)server; clientD)server; server2.In a client-server paradigmA)both the server and the client must be running all the time.B)both the server and the clien
2、t need to be running only when they are needed.C)the server must be running all the time but the client needs to be running only when it is needed.D)the client must be running all the time but the server needs to be running only when it is needed3.The first section of a URL identifier is the _.A)pro
3、tocolB)pathC)hostD)port4.A _ document is a fixed-content document that is created and stored in a server. The client can get a copy of the document only.A)staticB)dynamicC)activeD)None of the choices are correct5._ is a language for creating a static document.A)Extensible Style Language (XSL)B)Hyper
4、text Markup Language (HTML)C)Extensible Markup Language (XML)D)All choices are correct6.A _ document is created by a Web server whenever a browser requests the document.A)staticB)dynamicC)activeD)None of the choices are correct7.For many applications, we need a program or a script to be run at the c
5、lient site. These are called _ documents.A)staticB)dynamicC)activeD)None of the choices are correct8.HTTP uses the services of _.A)UDPB)IPC)TCPD)DNS9.In HTTP, the first line in a request message is called a _ line; the first line in the response message is called the _ line.A)request; responseB)stat
6、us; responseC)status; statusD)None of the choices are correct10.In a _ connection, one TCP connection is made for each request/response.A)persistentB)nonpersistentC)persistent or a nonpersistentD)None of the choices are correct11.In a _ connection, the server leaves the connection open for more requ
7、ests after sending a response.A)persistentB)nonpersistentC)persistent or nonpersistentD)None of the choices are correct12.In HTTP, _ server is a computer that keeps copies of responses to recent requests.A)a regularB)a proxyC)an auxiliaryD)a remote13.An HTTP request message always contains _.A)a hea
8、der line and a bodyB)a request line and a header lineC)a request line, a header line, and a bodyD)a request line, a header line, a blank line, and a body14.Which of the following is present in both an HTTP request line and a status line?A)version numberB)URLC)status codeD)method15.FTP uses the servi
9、ces of _.A)UDPB)IPC)TCPD)none of the choices are correct16.In FTP, _ well-known port(s) is (are) used.A)oneB)twoC)threeD)four17.During an FTP session the control connection is opened _.A)onceB)twiceC)many timesD)none of the choices are correct18.During an FTP session the data connection may be opene
10、d _.A)only onceB)only two timesC)as many times as neededD)none of the choices are correct19.In FTP, a file can be organized into records, pages, or a stream of bytes. These are types of an attribute called _.A)file typesB)data structuresC)transmission modesD)none of the choices are correct20.In FTP,
11、 there are three types of _: stream, block, and compressed.A)file typesB)data typesC)transmission modesD)none of the choices are correct21.In FTP, ASCII, EBCDIC, and image define an attribute called _.A)file typeB)data structureC)transmission modeD)none of the choices are correct22.In FTP, when we _
12、, it is copied from the client to the server.A)retrieve a fileB)store a fileC)open a fileD)none of the choices are correct23.In the common scenario, the electronic mail system needs _.A)two UAs, two MTAs and one MAAB)two UAs, two MTAs and two MAAsC)two UAs, two pairs of MTAs and a pair of MAAsD)two
13、UAs, two pairs of MTAs and a two pairs of MAAs24._ provides service to the user to make the process of sending or receiving a message easier.A)An MTAB)An MAAC)A UAD)None of the choices are correct25.An e-mail message contains the _ and the _.A)header; envelopB)header; bodyC)envelop; bodyD)None of th
14、e choices are correct26.In the Internet, an e-mail address consists of two parts: a _ and a _.A)local part; domain nameB)global part; domain nameC)label; domain nameD)local part; label27._ is a supplementary protocol that allows non-ASCII data to be sent through e-mail.A)SMPTB)MPEGC)MIMED)POP28.The formal protocol that defines the MTA client an
