网络知识练习题

Introduction to Data CommunicationsTrue-False QuestionsThe following are possible True/False questions for tests. The statement is given and the answer is provided in square brackets. The level of difficulty (easy, moderate, difficult) and the page number(s) relevant to the topic are also furnished. The pages may be slightly off due to new version of textbook.1.Due to recent advances in high speed communication networks, the information lag, or the time it takes for information to be disseminated around the world, has been significantly shortened.Answer:TrueDifficulty: EasyReference: p.52.One perspective of data communications and networking as stated in the textbook, examines the management of networking technologies, including security, network design, and managing the network on a day-to-day basis and long term basis. Answer:FalseDifficulty: ModerateReference: p. 63.The first electronic data communication system was the telephone developed by Alexander Graham Bell. Answer:FalseDifficulty:EasyReference: p. 74.The first transcontinental telephone service was established in the 1940s. Answer:FalseDifficulty:EasyReference: p. 75.The Internet was started by the U.S. Department of defense in 1969 as a network of four computers called ARPANET.Answer:True Difficulty: ModerateReference: p. 106.Telecommunications is the movement of computer information from one point to another by means of electrical or optical transmission systems.Answer:FalseDifficulty:ModerateReference: p. 127.A local area network (LAN) connects other LANs and BNs located in different areas to each other and to wide area networks in a span from 3 to 30 miles.Answer: FalseDifficulty:ModerateReference: p. 148.An intranet is a LAN that uses Internet technologies and is publicly available to people outside of the organization.Answer: FalseDifficulty:ModerateReference: p. 159.A car manufacturer may give access to certain portions of its network to some of its suppliers via Internet. This is an example of an Extranet.Answer: TrueDifficulty:ModerateReference: p. 1510.The OSI model is the most widely used network model to develop and build networks today.Answer: FalseDifficulty:ModerateReference: p. 1711.The network layer is responsible for routing messages from the source computer to the destination computer.Answer: TrueDifficulty:EasyReference: p. 1812.At the transport layer in the Internet model, TCP is responsible for breaking large files received from the application layer into smaller packets and opening a connection to a server for transferring the packets.Answer: TrueDifficulty: Difficult Reference: p. 2113.Ethernet is an example of a network layer protocol.Answer: Difficulty:EasyReference: p. 2114.Data communication standards enable each layer in the sending computer to communicate with its corresponding layer in the receiving computer.Answer: TrueDifficulty: EasyReference: p. 23-2415.The specification stage of the formal standardization process consists of developing nomenclature and identifying the problems to be addressed.Answer: TrueDifficulty: ModerateReference: p. 2416.The high bandwidth requirements (high communications needs) for video have slowed its integration into computer networks.Answer: True Difficulty: Moderate Reference: p. 2917.An Application Service Provider (ASP) develops a specific system and companies purchase or rent the service without installing the system on their own computers.Answer: True Difficulty: Moderate Reference: p. 30MULTIPLE CHOICEThe following are possible multiple-choice questions for tests. The question is posed and the answer is provided under the choices. The level of difficulty (easy, moderate, difficult) and the page number(s) relevant to the topic is also furnished. The pages may be slightly off due to new version of textbook.1.Data communications and networking can be considered as a global area of study because:a. new technologies and applications emerge from a variety of countries and spread around the worldb. the technologies enable global communicationc. the political and regulatory issues are exactly the same in every country d. a and be. none of the aboveAnswer: DDifficulty: Easy Reference: p. 52.In 1984, a federal judge broke up a highly contested telephone service monopoly and: a. set up the Telecommunications Competition and Deregulation Actb. permitted MCI to provide limited long distance service in the U.S.c. permitted telephone and/or computer equipment that was not manufactured by Bell Telephone to be connected to AT&Ts network d. divided AT&T into two parts: one part for long distance service, and a second part, comprised of seven regional operating companies, for local telephone servicee. set up deregulation for international telecommunications markets in 68 countries Answer: D Difficulty: Easy Reference: p. 83.In 1996, the U.S. Congress replaced all current laws, FCC regulations, and the consent decree for AT&T. It: a. set up the Telecommunications Competition and Deregulation Actb. permitted MCI to provide limited long distance service in the U.S.c. permitted telephone and/or computer equipment that was not manufactured by Bell Telephone to be connected to AT&Ts network d. divided AT&T into two parts: one part for long distance service, and a second part, comprised of seven operating companies, for local telephone servicee. set up deregulation for international telecommunications markets in 68 countries Answer: A Difficulty: Easy Reference: p. 84.Modern (1990s and beyond) data communication networks are characterized by:a. decks of punch cards b. online terminals for batch processingc. isolated (stand-alone) microcomputersd. batch I/O devicese. distributed systems that rely heavily on networkingAnswer: E Difficulty: Easy Reference: p. 105.In 1983, the Internet was split into two parts, one dedicated solely to the military and one dedicated to university research centers. The two parts were called:a. Intranet and Extranetb. BITNET and NSFNETc. Milnet and Internetd. ARPANET and Milnete. none of the aboveAnswer: C Difficulty: Moderate Reference: p. 116.Which of the following is not true about a server?a. stores data and software that can be accessed by the client.b. is the pathway through which messages travel.c. in client/server computing they work together over the network with client computers to support the business application.d. can only perform one function on a network.e. stores documents and graphics that can be accessed from any Web browser.Answer: D Difficulty: Difficult Reference: p. 13-147.Networks that are designed to connect similar computers that share data and software with each other are called:a. client/server networksb. peer-to-peer networksc. host networksd. client networkse. local area networksAnswer: B Difficulty: Easy Reference: p. 138.The function of the file server is to :a. store data and software programs that can be used by client computers on the network.b. manage all printing requests from clients on the network.c. transfer e-mail messages to other servers on the network.d. store HTML documents for an Internet or intranet web site.e. coordinate the communication of client and servers on the network.Answer: A Difficulty: Moderate Reference: p. 149.A local area network is:a. a large central network that connects other networks in a distance spanning exactly 5 miles. b. a group of microcomputers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.c. a network spanning a geographical area that usually encompasses a city or county area (3 to 30 miles).d. a network spanning a large geographical area (up to 1000s of miles).e. a network spanning exactly 10 miles with common carrier circuits.Answer: B Difficulty: Easy Reference: p. 14-1510.A backbone network is:a. a high speed central network that connects other networks in a distance spanning up to several miles. b. a group of microcomputers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.c. a network spanning a geographical area that usually encompasses a city or county area (3 to 30 miles).d. a network spanning a large geographical area (up to 1000s of miles).e. a network spanning exactly 200 miles with common carrier circuits.Answer: A Difficulty: Moderate Reference: p. 14-1511.A metropolitan area network is:a. a high speed central network, built with privately owned media, which connects other networks in a distance spanning up to several miles. b. a group of microcomputers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.c. a network that spans a geographical area that usually encompasses a city or county area (3 to 30 miles) and that typically uses common carrier circuits.d. a network spanning a large geographical area (up to 1000s of miles).e. a network spanning exactly 543.56 miles with private media.Answer: C Difficulty: Easy Reference: p. 1512.Which of the following is not a property of a WAN:a. connects backbone networks and MANS.b. spans hundreds or thousands of milesc. provides data transmission speeds from 56Kbps to 10Gbps.d. connects a group of computers in a small geographic area such as room, floor, building or campus.e. uses lease lines from IXCs like ATT, MCI, Sprint.Answer: D Difficulty: Moderate Reference: p. 1513.A(n) _ is a LAN that uses the same technologies as the Internet but is open to only those inside the organization. a. WANb. BNc. extranetd. intranete. MANAnswer: D Difficulty: Easy Reference: p. 1514.Which layer of the OSI model is responsible for ensuring that all packets sent are received by the destination station by dealing with end-to-end issues?a. presentation Layerb. transport Layerc. physical Layerd. session Layere. application LayerAnswer: B Difficulty: Easy Reference: p. 1815.Which layer of the OSI model is responsible for ensuring that the destination station does not receive more packets that it can process at any given time?a. presentation Layerb. transport Layerc. physical Layerd. session Layere. application LayerAnswer: B Difficulty: Easy Reference: p. 1816.The _ layer of the OSI model is responsible for data format translation.a. sessionb. presentationc. physicald. applicatione. transportAnswer: B Difficulty: Easy Reference: p. 1917.The fourth layer of the OSI model is called the _ layer.a. network b. transport c. session d. data linke. presentation Answer: B Difficulty: Easy Reference: p. 1818.In the Internet model, the application layer corresponds to the _, layer(s) s of the OSI model.a. data link and networkb. session, presentation and applicationc. application layerd. application and presentatione. network, transport and presentationAnswer: B Difficulty: Difficult Reference: p. 1919.The _ layer performs error checking which is redundant with the function of the _ layer.a. application, presentationb. physical, data linkc. transport, data linkd. presentation, transporte. network, physicalAnswer: C Difficulty: Moderate Reference: p. 2020.The _ layer is responsible for end-to-end transfer of messages from the sender to the final destination.a. data communication layerb. resident layerc. application layerd. network layere. physical layerAnswer: D Difficulty: Easy Reference: p. 2021.Which of the following is not a function of the data link layer?a. deciding when to transmit messages over the mediab. formatting the message by indicating where messages start and end, and which part is the addressc. detecting and correcting any errors that have occurred in the transmission of the messaged. specifying the type of connection, and the electrical signals, radio waves, or light pulses that pass through ite. controlling the physical layer by determining when to transmit Answer: D Difficulty: Easy Reference: p. 2022.Which of the following is a term used to group together the physical and data link layers? a. Internetwork layersb. Hardware layersc. Software layersd. Middleware layerse. Application layersAnswer: B Difficulty: Moderate Reference: p. 2023.Which of the following would be standard used at the Data Link layer of the Internet or OSI model?a. IPb. TCPc. Ethernetd. HTTPe. FTPAnswer: C Difficulty: Moderate Reference: p. 1824.In which layer of the Internet model would the HTTP standard be used?a. physicalb. applicationc. transportd. networke. data linkAnswer: B Difficulty: Moderate Reference: p. 2125.A(n) _ is a set of rules that determine what a layer would do and provides a clearly defined set of messages that software at the layer needs to understand.a. agreementb. standardc. protocold. regulationse. policyAnswer: C Difficulty: Moderate Reference: p. 2326.The network layer of the Internet model uses the _ protocol to route messages though the network.a. TCPb. HTTPc. FTPd. SMTPe. IPAnswer: E Difficulty: Moderate Reference: p. 2127.Which of the following is not true about formal standards?a. They are always developed before de facto standards.b. One example exists for network layer software (IP).c. They can be developed by an official industry body.d. They can take several years to deve