计算机网络教程自顶向下方法选择题及答案 Chapt 2 Application Layer-QUIZZ.docx

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 client 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)protocolB)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)Hypertext 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 client 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)status; 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 requests 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 header 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 services 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 opened _.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, 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 _, 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 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 the 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 and server in the Internet is called _.A)SMTPB)SNMPC)TELNETD)SSH29.SMTP is a _ protocol.A)pullB)pushC)push and pullD)None of the choices are correct30.The message access protocol is a _ protocol.A)pullB)pushC)push and pullD)None of the choices are correct31.In the _ encoding scheme, each 24 bits become four 6-bit chunks, and eventually are sent as 32 bits.A)8bitB)binaryC)base64D)quoted-printable32.In the _ encoding scheme, a non-ASCII character is sent as 3 characters.A)8bitB)base64C)quoted-printableD)binary33.TELNET is an abbreviation for _.A)terminal networkB)telephone networkC)telecommunication networkD)None of the choices are correct34.When a user logs into a local time-sharing system, it is called _ login.A)localB)remoteC)local or remoteD)None of the choices are correct35.When a user wants to access an application program or utility located on a remote machine, he or she performs _ login.A)localB)remoteC)local or remoteD)None of the choices are correct36.Network Virtual Terminal (NVT) uses two sets of characters, one for _ and one for _.A)sending; receivingB)request; replyC)data; controlD)None of the choices are correct37.For data, NVT uses US ASCII characters with the highest order bit set to _.A)1B)0C)1 or 0D)None of the choices are correct38.For control, NVT uses US ASCII characters with the highest order bit set to _.A)1B)0C)1 or 0D)None of the choices are correct39.The _ translates local characters into NVT characters.A)terminal driverB)TELNET clientC)TELNET serverD)pseudoterminal driver40.The _ translates NVT characters into a form acceptable by the remote operating system.A)terminal driverB)TELNET clientC)TELNET serverD)pseudoterminal driver41.The _ component in the SSH provides confidentiality, integrity, authentication and compression.A)SSH ApplicationB)SSH-AUTHC)SSH-CONND)SSH-TRAN42.Port forwarding is _.A)a protocol used to forward messages from one port to another portB)a procedure for changing an ephemeral port to a well-known portC)a service, provided by SSH, that creates a secure channel for applications that do not have security services.D)None of the choices are correct43.In a _ name space, a name is a sequence of characters without structure.A)linearB)flatC)hierarchicalD)organized44.In a _ name space, each name is made of several parts.A)linearB)flatC)hierarchicalD)organized45.In the DNS, the names are defined in _ structure.A)a linear listB)an inverted-treeC)a three-dimensionalD)None of the choices are correct46.The root of the DNS tree is _.A)a string of 127 charactersB)a string of 63 charactersC)a string of 15 charactersD)an empty string47.In the domain name space, a full domain name is a sequence of labels separated by _.A)colonsB)semicolonsC)dotsD)commas48.In the domain name space, if a label is terminated by a null string, it is called a _.A)PQDNB)CQDNC)SQDND)None of the choices are correct49.In the domain name space, if a label is not terminated by a null string, it is called a _.A)FQDNB)PQDNC)SQDND)None of the choices are correct50.In the domain name space, a _ is a subtree of the domain name space.A)labelB)nameC)domainD)None of the choices are correct51.In the domain name space, what a server is responsible for or has authority over is called a _.A)domainB)labelC)zoneD)None of the choices are correct52.A _ server is a computer whose zone system consists of the whole tree.A)domainB)zoneC)rootD)primary53.A _ server is a computer that stores a file about the zone for which it has an authority.A)primaryB)secondaryC)zoneD)root54.A _ server is a computer that transfers the complete information about a zone from another server.A)primaryB)secondaryC)zoneD)root55.In the Internet, the country domain section uses _ country abbreviations.A)two-characterB)three-characterC)four-characterD)None of the choices are correct56.In _ resolution, the resolver expects the server to supply the final answer.A)iterativeB)recursiveC)straightD)None of the choices are correct57.In _ resolution, the server returns the IP address of the server that it thinks can resolve the query.A)iterativeB)recursiveC)straightD)None of the choices are correct58.DNS can use the services of _.A)UDPB)TCPC)either UDP or TCPD)None of the choices are correct59.A registrar, a commercial entity accredited by _ is responsible for adding new domains to DNS data baseA)NICB)ICANNC)ISOCD)IEFE60.In a centralized P2P network, the directory system uses the _ paradigm; the storing and downloading of the files are done using _ paradigm.A)client-server; client-serverB)peer-to-peer; client-serverC)client-server; peer-to-peerD)peer-to-peer; peer-to-peer61.Napster is an example of a _ peer-to-peer networkA)centralizedB)structured-decentralizedC)unstructured-decentralizedD)None of the choices are correct62.Gnutella is an example of a _ peer-to-peer networkA)centralizedB)structured-decentralizedC)unstructured-decentralizedD)None of the choices are correct63.BitTorrent is an example of a _ peer-to-peer networkA)centralizedB)structured-decentralizedC)unstructured-decentralizedD)None of the choices are correct64.In a structured-decentralized P2P network, _.A)the directory system is kept in a centerB)a query to find a file must be flooded through the networkC)a pre-defined set of rules is used to link nodes so that a query can be effectively and efficiently resolvedD)None of the choices are correct65.In a DHT-based network, each peerA)has a partial knowledge about the whole network.B)has a complete knowledge about the whole network.C)only has a knowledge about its successor.D)None of the choices are correct66.The finger table is the routing table used in _.A)GnutellaB)PastryC)KademliaD)None of the choices are correct67.Which of the following is not a Chord inter