A GUIDE TO DESIGNING AND IMPLEMENTING LOCAL AND WIDE AREA NETWORKS, 2ND EDITION MICHAEL - TEST BANK

Chapter 3 - Physical Transmission Options TRUE/FALSE 1. One advantage of LDAP is that it enables information in different directory services to be shared. ANS: T PTS: 1 REF: 98 2. Wireless technologies are used in situations where it is difficult or too expensive to use cable and in situations in which flexibility to move network hosts and devices is a requirement. ANS: T PTS: 1 REF: 100 3. On thick coax cable, if you attach devices more closely than 12.5 meters, the signal can be impaired, and network errors may result. ANS: F PTS: 1 REF: 102 4. An advantage of twisted-pair cable compared to thin coax cable is that it is resistant to EMI and RFI. ANS: F PTS: 1 REF: 105 5. The maximum number of segments in 10BaseT UTP ethernet cable is 500. ANS: F PTS: 1 REF: 109 6. Fat pipe is another name for STP cable. ANS: F PTS: 1 REF: 111 7. Ethernet communications at speeds up to 100 Mbps as defined under the IEEE 802.3u standard are called Fast Ethernet. ANS: T PTS: 1 REF: 115 8. 10 Gigabit Ethernet operates only at full duplex. ANS: T PTS: 1 REF: 118 9. Statistical multiple access is a switching method that enables multiple devices to communicate over the same communications medium by creating time slots in which each device transmits. ANS: F PTS: 1 REF: 132 MODIFIED TRUE/FALSE 1. The EIA/TIA-568 standard specifies that vertical cabling run between network equipment rooms, floors, and buildings. _________________________ ANS: F, backbone PTS: 1 REF: 99 2. Interfaces are devices to which the communications media connect. _________________________ ANS: T PTS: 1 REF: 100 3. Resistance is defined as the total amount of opposition to the flow of current and is measured in ohms. _________________________ ANS: F, Impedance PTS: 1 REF: 102 4. The maximum speed of thick coax cable is 100 Mbps. _________________________ ANS: F, 10 PTS: 1 REF: 103 5. The "S" in STP stands for standard. _________________________ ANS: F, shielded PTS: 1 REF: 106 6. The larger the number associated with AWG, the smaller the diameter of the wire. _________________________ ANS: T PTS: 1 REF: 109 7. The IEEE 802.12 standard uses the CSMA/CD transmission technique. _________________________ ANS: F, demand priority PTS: 1 REF: 116 8. A(n) driver is software that enables a computer to communicate with devices such as NICs, printers, monitors, and hard disk drives. _________________________ ANS: T PTS: 1 REF: 121 9. A(n) multiplexer is a device that receives multiple inputs or signals from multiple sources and transmits them to one (usually) or more shared high-speed media. _________________________ ANS: T PTS: 1 REF: 124 10. ISDN is a WAN technology for delivering voice, data, and video services over telephone lines. _________________________ ANS: T PTS: 1 REF: 127 MULTIPLE CHOICE 1. ____ is the WAN standard for packet-switching networks. a. X.400 c. X.435 b. X.25 d. V ANS: B PTS: 1 REF: 97 2. ____ are the standards for international exchange of e-mail and message handling. a. X.400 c. X.435 b. X.25 d. V ANS: A PTS: 1 REF: 97 3. The ____ standard introduced the client-to-directory access protocol (DAP) and directory-to-directory protocol (DSP). a. X.400 c. X.435 b. X.25 d. X.500 ANS: D PTS: 1 REF: 98 4. The ____ is a nonprofit international organization that sponsors conferences and publications and coordinates Internet standards. a. IEEE c. ISO b. ISOC d. ICANN ANS: B PTS: 1 REF: 99 5. The ____ standard is used for centralizing communication cable connections in specific locations. a. EIA/TIA-569-A c. EIA/TIA-568 b. ISO/IEC 11801 d. 802.15 ANS: A PTS: 1 REF: 100 6. The most basic level of communications is accomplished at the OSI ____ layer. a. Network c. Physical b. Transport d. Data Link ANS: C PTS: 1 REF: 100 7. ____ is/are based on copper wire construction. a. Coaxial cable c. Wireless media b. Fiber-optic cable d. Both A and B. ANS: A PTS: 1 REF: 100 8. ____ is the most commonly used cabling. a. Coaxial c. Wireless media b. Fiber-optic d. Twisted pair ANS: D PTS: 1 REF: 100 9. ____ is/are used mainly in older LANs and in LANs that exist in areas with strong sources of signal interference. a. Coaxial cable c. Twisted pair cable b. Fiber-optic cable d. Wireless technologies ANS: A PTS: 1 REF: 100 10. ____ is/are usually used to connect computers that demand high-speed LAN and WAN access. a. Coaxial cable c. Twisted pair cable b. Fiber-optic cable d. Wireless technologies ANS: B PTS: 1 REF: 100 11. An AUI connects ____ cable to a network node. a. coax c. fiber-optic b. twisted-pair d. All of the above. ANS: D PTS: 1 REF: 129 12. The "A" in AUI stands for ____. a. additional c. attachment b. added d. alternate ANS: C PTS: 1 REF: 102 13. The capacity of a channel to transmit data in terms of given speeds, such as 10Mbps, is its ____. a. throughput c. transmission speed b. bandwidth d. attenuation ANS: B PTS: 1 REF: 103 14. The longest cable run in 10Base5 cable is ____. a. 10 meters c. 100 meters b. 50 meters d. 500 meters ANS: D PTS: 1 REF: 102 15. Which is not true about thick coax cable? a. It is very durable. c. It is inexpensive to install. b. It is very reliable. d. None of the above. ANS: C PTS: 1 REF: 103 16. Thin coax cable is also known as ____. a. 10Base2 c. RG-8 b. 10Base10 d. 10Base5 ANS: A PTS: 1 REF: 103 17. The figure above shows ____ cable. a. twisted pair c. thin coax b. thick coax d. STP ANS: C PTS: 1 REF: 104 18. A(n) ____ connector is used with thin coax cable. a. AUI c. BNC b. MAU d. RJ-45 ANS: C PTS: 1 REF: 104 19. ____ is the easiest type of cable to install and use. a. Twisted pair c. Thin coax b. Thick coax d. None of the above. ANS: A PTS: 1 REF: 105 20. Common practice is to limit runs on ____ cable to 90 meters or less. a. twisted pair c. thin coax b. thick coax d. plenum ANS: A PTS: 1 REF: 106 21. A(n) ____ connector is used with twisted-pair cable. a. ST c. BNC b. RJ-11 d. RJ-45 ANS: D PTS: 1 REF: 106 22. ____ is commonly called 10BaseT cable. a. STP c. Thin coax b. Thick coax d. UTP ANS: D PTS: 1 REF: 108 23. Category ____ twisted-pair cable has a transmission rate of 1000 Mbps. a. 5 c. 5e b. 6 d. Both B and C. ANS: D PTS: 1 REF: 108 24. The longest cable run in 10BaseT UTP ethernet cable is ____. a. 10 meters c. 100 meters b. 50 meters d. 500 meters ANS: C PTS: 1 REF: 109 25. Cladding is a term used when discussing ____ cable. a. twisted pair c. thin coax b. thick coax d. fiber optic ANS: D PTS: 1 REF: 110 26. ____ cable does not experience EMI or RFI. a. Coaxial cable c. Twisted pair cable b. Fiber-optic cable d. None of the above. ANS: B PTS: 1 REF: 111 27. Which is not true about fiber-optic cable? a. It is very difficult for someone to install unauthorized taps. b. It is expensive to install. c. It can be used for either analog or digital communications. d. None of the above. ANS: C PTS: 1 REF: 111 28. A(n) ____ connector is used most often with fiber-optic cable. a. SC c. BNC b. RJ-11 d. RJ-45 ANS: A PTS: 1 REF: 112 29. In____ multimode fiber-optic cable, signals all arrive at the same time and with less long-distance distortion than the other type of multimode fiber-optic cable. a. step-index c. graded-index b. even-index d. single-index ANS: C PTS: 1 REF: 112 30. ____ does not use the CSMA/CD access method for transmission of signals. a. 100BaseT2 c. 100BaseFX b. 100BaseTX d. 100BaseT4 ANS: A PTS: 1 REF: 115 31. Which is not true about demand priority? a. It enables packets to travel up to 100 Mbps. b. Because only the receiving node sees the transmitted packet, data cannot be viewed and decoded at any other node. c. It can give high priority to multimedia and time-sensitive transmissions, so that voice and video are transmitted within appropriate time sequences to prevent excessive distortion. d. None of the above. ANS: D PTS: 1 REF: 117 32. ____ is targeted for installations that use the Network layer, or layer 3, routed communications. a. Fast Ethernet c. 10 Gigabit Ethernet b. Gigabit Ethernet d. Both A and B. ANS: B PTS: 1 REF: 118 33. 10 Gigabit Ethernet is the IEEE ____ standard. a. 802.12 c. 802.3u b. 802.3ae d. 802.2 ANS: B PTS: 1 REF: 118 34. ____ options are used for short-distance communications. a. Microwave c. Infrared b. Satellite d. All of the above. ANS: C PTS: 1 REF: 129 35. ____ communications through public dial-up lines and leased telephone lines represent the most basic WAN carrier communications. a. SONET c. Point-to-point b. ISDN d. T-carrier ANS: C PTS: 1 REF: 123 36. ____ is an established high-speed WAN alternative offered by several telecommunications companies. a. SONET c. ATM b. ISDN d. ANI ANS: A PTS: 1 REF: 125 YES/NO 1. Structured wiring are principles for cabling areas and network systems in a building, including backbones, wiring closets and equipment rooms, work areas, and building entrance cabling. ANS: Y PTS: 1 REF: 99 2. Wireless media are radio or microwaves. ANS: Y PTS: 1 REF: 100 3. The figure above is an example of thin coax cable. ANS: N PTS: 1 REF: 101 4. A minimum bend radius is applicable when using thick coax cable. ANS: Y PTS: 1 REF: 102 5. UTP cable is not susceptible to interference. ANS: N PTS: 1 REF: 107 6. Upstream bandwidth is usually lower than downstream. ANS: Y PTS: 1 REF: 114 7. Gigabit Ethernet uses demand priority. ANS: N PTS: 1 REF: 117 8. Packets are physically transmitted on a network by means of a network interface card. ANS: Y PTS: 1 REF: 120 9. A CSU is like a digital modem that converts the received signal to one that can be placed on a network and be received by a workstation or server. ANS: N PTS: 1 REF: 124 COMPLETION 1. The EIA/TIA-568 standard specifies that ____________________ cabling be used to connect workstations and servers in the work area. ANS: horizontal PTS: 1 REF: 99 2. ____________________ cable is usually glass. ANS: Fiber-optic Fiber optic PTS: 1 REF: 100 3. ____________________ cable is Teflon-coated and does not emit a toxic vapor when burned. ANS: Plenum PTS: 1 REF: 101 4. The impedance of thin coax cable is ____________________. ANS: 50 ohms PTS: 1 REF: 105 5. The impedance of 10BaseT UTP ethernet cable is ____________________. ANS: 100 ohms PTS: 1 REF: 109 6. Attenuation in fiber-optic cable is measured in ____________________. ANS: decibels PTS: 1 REF: 111 7. The ____________________ for optical fiber cable communications is the difference between the transmitted power and the resulting signal strength, or sensitivity, at the receiver as measured in decibels. ANS: power budget PTS: 1 REF: 112 8. A(n) ____________________ cable is a cable that consists of a single cable sheath containing a combination of fibers and copper cables. ANS: hybrid fiber/coax HFC PTS: 1 REF: 114 9. A(n) ____________________ typically contains a fixed amount of data formatted to be transmitted at high speeds, from 155 Mbps to over 1 Gbps. ANS: cell PTS: 1 REF: 121 MATCHING Match each correct item with the statement below. a. ANSI f. LDAP b. IEEE g. ICANN c. IETF h. ISO d. ITU i. TIA e. ISOC j. EIA 1. Sets standards for modems, e-mail, and digital telephone systems. 2. Develops standards for electrical interfaces, such as serial interfaces on computers. 3. Works with U.S. businesses, government agencies, and international groups to achieve agreement on standards for products ranging from bicycle helmets to communications cable. 4. A nongovernmental organization that promotes international cooperation and standards in science, technology, commerce and intellectual discovery. 5. Develops telecommunications and cabling standards. 6. Responsible for the 802 standards. 7. Focuses on technical Internet issues such as routing. 8. Developed in the 1990s as a way to realistically implement portions of the X.500 standard. 9. Coordinates domain naming. 1. ANS: D PTS: 1 REF: 97 2. ANS: J PTS: 1 REF: 99 3. ANS: A PTS: 1 REF: 96 4. ANS: H PTS: 1 REF: 98 5. ANS: I PTS: 1 REF: 99 6. ANS: B PTS: 1 REF: 96 7. ANS: C PTS: 1 REF: 99 8. ANS: F PTS: 1 REF: 98 9. ANS: G PTS: 1 REF: 99 SHORT ANSWER 1. What is a directory service? What does it do? Name one directory service. ANS: A directory service is a large container of network data and resources, such as computers, printers, user accounts, and user groups that (1) provides a central listing of resources and ways to quickly find specific resources and (2) provides a way to access and manage network resources. Novell Directory Services and Microsoft Active Directory are both examples of directory services. PTS: 1 REF: 98 2. List five factors that should be considered when choosing the best medium for a LAN or WAN. ANS: Factors that should be considered when choosing the best medium for a LAN or WAN are: 1. Data transfer speed 2. Use in specific network topologies 3. Distance requirements 4. Cable and component costs 5. Additional network equipment that might be required 6. Flexibility and ease of installation 7. Immunity to interference from outside sources 8. Upgrade options PTS: 1 REF: 100 3. What is the difference between a baseband transmission and a broadband transmission? ANS: A baseband transmission is one in which the entire channel capacity of the medium is used by one data signal. Thus, only one node transmits at a time. A broadband transmission employs several transmission channels on a single communications medium This allows more than one node to transmit at the same time. PTS: 1 REF: 103 4. What are the two kinds of twisted-pair cable? Which is preferred? Why? ANS: The two kinds of twisted-pair cable are shielded and unshielded. Unshielded cable is preferred because of its lower cost and high reliability. PTS: 1 REF: 106 5. What is attenuation? ANS: Attenuation, or power loss, is the amount of signal that is lost as it travels through a communications medium from its source (transmitting node) to the receiving node. PTS: 1 REF: 111 6. What are the two types of fiber optic cable? What is the communications signal for each? ANS: Fiber-optic cable comes in two modes - single-mode and multimode. Single-mode fiber-optic cable is used mainly for long-distance communications. The central core diameter is much smaller than that of multimode cable. Laser light is the communications signal for single-mode cable, and this type of cable enables long-distance transmissions at high speeds. Multimode fiber-optic cable can support simultaneous transmission of multiple light waves for broadband communications. The transmission distance potential is not as great as for single-mode cable, because the available bandwidth is smaller and the light source is weaker. The transmission source for multimode cable is a light-emitting diode (LED) device that is in the sending node's network interface. PTS: 1 REF: 112 7. What is demand priority? What kind of networks use it? What IEEE standard uses this? ANS: Demand priority is a data communications technique that transmits a packet directly from the sending node, through a hub, and to the receiving node, without passing through other network nodes. It ensures that the transmitted signal travels only in one direction and is used in star networks, where workstations are linked by a central hub. The IEEE 802.12 standard uses this technique. PTS: 1 REF: 116 8. What does QoS stand for? What is it? ANS: QoS, or Quality of Service, is a measurement specification of the transmission quality, throughput, and reliability of a network system. PTS: 1 REF: 122 9. What are the two methods of placing digital signals on the network? ANS: The two methods of placing digital signals on the network are TCM and echo cancellation. Time-compression multiplexing (TCM) sends 16- to 24-bit blocks of data in alternating digital bursts. Echo cancellation transmits data in two directions at the same time. PTS: 1 REF: 127