Data and Computer Communications, 10th Edition, by William Stallings CHAPTER 1: DATA COMMUNICATIONS, DATA NETWORKS, AND THE INTERNET MULTIPLE CHOICE 1. Enterprises have formed ________ to reach customers, suppliers, and partners while isolating their proprietary information from unwanted access. A) intranets and extranets B) internets and extranets C) WANS and extranets D) LANS and WANS 2. DWDM enables capacities of ________ per second. A) terabits B) picobits C) megabits D) gigabits 3. The growth of ________ enhances the ability of employees to take their business context with them as they move about, resulting in the ability to use enterprise information resources and services from virtually anywhere. A) extranets B) high-speed wireless access C) WANS D) remote data access 4. An ________ uses Internet and Web technology in an isolated facility internal to an enterprise. A) application network B) intranet C) extranet D) Internet portal 5. A network in which small chunks of data are passed through the network from node to node, and at each node the entire data chunk is received, stored briefly, and then transmitted to the next node, is a ________ network. A) packet switching B) ATM Data and Computer Communications, 10th Edition, by William Stallings C) circuit switching D) frame relay 6. A dominant architecture in the business environment and the more recent Web-focused intranet trend is ________ computing. A) Ethernet B) GUI C) token ring D) client/server 7. The rapid conversion of consumer electronics to digital technology is having an impact on both the Internet and corporate intranets. Two examples of this trend are ________. A) server farms and DVDs B) power workgroups and server farms C) DVDs and CD-ROMs D) digital versatile disks and digital still cameras 8. The key elements of a simple communications model are ________. A) source, transmission, destination B) signal, transmission, receiver C) source, signal, destination D) source, signal, receiver 9. Once an interface is established ________ is required for communication. A) digital conversion B) signal generation C) synchronization D) transmission 10. In order for data processing devices to communicate certain conventions must be decided on. These requirements can collectively be termed ________. A) synchronization B) transmission systems Data and Computer Communications, 10th Edition, by William Stallings C) exchange management D) flow control 11. In situations in which an information exchange is interrupted due to a fault somewhere in the system, ________ techniques are needed to either resume activity at the point of interruption or to restore systems to their state prior to the beginning of the exchange. A) flow control B) routing control C) recovery D) error correction 12. In a ________ network, a dedicated communications path is established between two stations through the nodes of the network. The telephone network is the most common example. A) frame relay B) ATM C) circuit switching D) packet switching 13. A ________ is a physical facility that provides the infrastructure to move data between connected networks. A) ATM B) FDDI C) NAP D) NSP 14. Individual hosts and LANs are connected to an Internet Service Provider through a ________. A) NAP B) CPE C) POP D) NSP 15. The place where telephone companies terminate customer lines and locate switching equipment to interconnect those lines with other networks is the ________. A) CO B) ISP Data and Computer Communications, 10th Edition, by William Stallings C) POP D) NAP SHORT ANSWER 1. Three different forces have consistently driven the architecture and evolution of data communications and networking facilities: traffic growth, development of new services, and ________. 2. Today's networks can offer differing levels of ________, which include specifications for maximum delay and minimum throughput. 3. Recent offerings of ________ multiplexing enable capacities of many terabits per second for long-distance telecommunication and data network links. 4. ________ involves moving voice into a data infrastructure, integrating all the voice and data networks inside a user organization into a single data network infrastructure, and then extending that into the wireless arena. 5. An ________ extends a company's intranet out onto the Internet to allow selected customers, suppliers, and mobile workers to access the company's private data and applications. 6. The need to make efficient use of transmission facilities that are typically shared among a number of communicating devices is referred to as ________. 7. There is a potential for error in all communication systems, therefore, _________ and correction are required in circumstances where errors cannot be tolerated. 8. __________ is required to assure that the source does not overwhelm the destination by sending data faster than they can be processed and absorbed. 9. ________ is the process of squeezing the data down so that a lower capacity, cheaper transmission facility can be used to meet a given demand. 10. Networks that generally cover a large geographical area, require the crossing of public right-of-ways, consist of a number of interconnected switching nodes, and rely on circuits provided by a common carrier are ________. 11. Using fixed length packets and sometimes referred to as cell relay, ________ is a culmination of developments in circuit switching and packet switching. It is so efficient that it can offer a constant data rate channel even though it is using a packet switching technique. 12. ________ networks provide advantages in the areas of mobility and ease of Data and Computer Communications, 10th Edition, by William Stallings installation and configuration. 13. The Internet evolved from the ________ which was developed in 1969 by the Advanced Research Projects Agency of the U.S. Department of Defense. 14. Communicating across arbitrary, multiple, packet-switched networks is ________. 15. Each IP packet includes an unique numeric address of the destination host. This address is referred to as an ________.