Multiple Choice Question of Computer Networking
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Multiple Choice question of computer networking
Question 1: In OSI network architecture, the dialogue control and token management are responsibility of a. session layer b. network layer c. transport layer d. data link layer e. none of above Question 2: In OSI network architecture, the routing is performed by a. network layer b. data link layer c. transport layer Question 3: Which of the following performs modulation and demodulation? a. fibre optics b. Satellite c. coaxial cable
d. session layer
e. none of above
d. Modem
e. none of the above
Question 4: The process of converting analogue signals into digital signals so they can be processed by a receiving computer is referred to as: a. modulation b. Demodulation c. Synchronizing d. Digitising Question 5: How many OSI layers are covered in the X.25 standard? a. Two b. Three c. Seven d. Six Question 6: Layer one of the OSI model is a. physical layer b. link layer Question 7: The x.25 standard specifies a a. technique for start-stop data d. data bit rate
e. None of above
c. transport layer
d. network layer
e. none of above
b. technique for dial access e. none of above
c. DTE/DCE interface
Question 8: Which of the following communication modes support two-way traffic but in only one direction at a time? a. simplex b. half duplex c. three-quarters duplex d. all of the above e. none of the above Question 9: Which of the following might be used by a company to satisfy its growing communications needs? a. front end processor b. Multiplexer c. Controller d. Concentrator e. all of the above Question 10: What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard? a. 4 b. 2 c. 6 d. 3 e. none of the above
Correct Answers:
1. a 6. a 2. a 7. c 3. d 8. B 4. d 9. E 5. B 10. d
Question 11: The interactive transmission of data within a time sharing system may be best suited to a. simplex lines b. half-duplex lines c. full duplex lines d. diplex-lines Question 12: Which of the following statement is incorrect? a. The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission. b. Half duplex line is a communication line in which data can move in two directions, but not at the same time. c. Teleprocessing combines telecommunications and DP techniques in online activities d. Batch processing is the preferred processing mode for telecommunication operation. Question 13: Which of the following is considered a broad band communication channel? a. coaxial cable b. fibre optics cable c. microwave circuits Question 14: Which of the following is not a transmission medium? a. telephone lines b. coaxial cables c. Modem
d. all of above
d. microwave systems
Question 15: Which of the following does not allow multiple uses or devices to share one communication line? a. doubleplexer b. Multiplexer c. Concentrator d. controller Question 16: Which of the following signal is not standard RS-232-C signal? a. VDR b. RTS c. CTS d. DSR Question 17: Which of the following statement is incorrect? a. Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line b. HDLC is a standard synchronous communication protocol. c. RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data d. RTS/CTS is the way the terminal indicates ringing Question 18: Which of the following is an advantage to using fiber optics data transmission? a. resistance to data theft b. fast data transmission rate c. low noise level
d. all of above
Question 19: Which of the following is required to communicate between two computers? a. communications software b. Protocol c. communication hardware d. all of above including access to transmission medium Question 20: The transmission signal coding method of TI carrier is called a. Bipolar b. NRZ c. Manchester d. Binary
Answers:
11. b 12. D 13. D 14. C 15. A 16. A 17. d 18. d 19. D 20. a Question 21: Which data communication method is used to transmit the data over a serial communication link? a. simplex b. half-duplex c. full-duplex d. b and c e. None of above
Question 22: What is the minimum number of wires needed to send data over a serial communication link layer? a. 1 b. 2 c. 4 d. 6 e. none of above Question 23: Which of the following types of channels moves data relatively slowly? a. wide band channel b. voice band channel c. narrow band channel Question 24: Most data communications involving telegraph lines use: a. simplex lines b. wideband channel c. narrowband channel
d. dialled service
Question 25: A communications device that combines transmissions from several I/O devices into one line is a a. concentrator b. Modifier c. Multiplexer d. full-duplex line
Question 26: How much power (roughly) a light emitting diode can couple into an optical fibre? a. 100 microwatts b. 440 microwatts c. 100 kilowatts d. 10 miliwatts Question 27: The synchronous modems are more costly than the asynchronous modems because a. they produce large volume of data b. they contain clock recovery circuits c. they transmit the data with stop and start bits d. they operate with a larger bandwidth e. none of above Question 28: Which of the following statement is correct? a. terminal section of a synchronous modem contains the scrambler b. receiver section of a synchronous modem contains the scrambler c. transmission section of a synchronous modem contains the scrambler d. control section of a synchronous modem contains the scrambler e. none of the above Question 29: In a synchronous modem, the digital-to-analogue converter transmits signal to the a. equalizer b. Modulator c. Demodulator d. Terminal e. none of above Question 30: Which of the following communications lines is best suited to interactive processing applications? a. narrow band channel b. simplex lines c. full duplex lines d. mixed band channels
Answers
21. c 22. B 23. C 24. C 25. C 26. a
27. b
28. C
29. A
30. c
Question:31 A remote batch-processing operation in which data is solely input to a central computer would require a. telegraph line b. simplex lines c. mixed bad channel d. all of above
Question 32: A band is always equivalent to a. a byte b. a bit
c. 100 bits
d. none of above
Question 33: The loss in signal power as light travels down the fibre is called a. attenuation b. Progration c. Scattering
d. interruption
Question 34: Avalanche photodiode receivers can detect bits of transmitted data by receiving a. 100 photons b. 200 photons c. 2000 photons d. 300 photons
Question 35: Communication circuits that transmit data in both directions but not at the same time are operating in a. a simplex mode b. a half duplex mode c. a full duplex mode d. an asynchronous mode
Question 36: An example of a medium speed, switched communications service is a. series 1000 b. data phone 50 c. DDD d. All of the above
Question 37: In communication satellite, multiple repeaters are known as a. detector b. Modulator c. Stations
d. transponders
Question 38: While transmitting odd-parity coded symbols, the number of zeros in each symbol is a. odd b. Even c. a and b both d. unknown
Question 39: Data communications monitors available on the software marked include a. ENVIRON/1 b. TOTAL c. BPL d. Telnet
Question 40: An example of an analogue communication method is a. laser beam b. Microwave c. voice grade telephone line
d. all of the above
Answers
31. b 36. c 32. D 37. d 33. A 38. D 34. B 39. A 35. B 40. d
Question:41 Number of bits per symbol used in Baud code is a. 7 b. 5 c. 8 d. 9 Question 42:
What is the main difference between DDCMP and SDLC? a. DDCMP does not need special hardware to final the beginning of a message b. DDCMP has a message header c. SDLC has a IP address d. SDLC does not use CRC Question 43: An example of digital, rather than analogue, communication is a. DDD b. DDS c. WATS d. DDT Question 44: Terminals are required for a. real-time, batch processing & time-sharing b. real time, time-sharing & distributed message processing c. real time, distributed processing & manager inquiry d. real-time, time sharing & message switching Question 45: The receive equalizer reduces delay distortions using a a. tapped delay lines b. Gearshift
c. Descrambler
d. difference engine
Question 46: Ina synchronous modem, the receive equalizer is known as a. adaptive equalizer b. impairment equalizer c. Statistical equalizer Question 47: The channel in the data communication model can be a. postal mail services b. telephone lines Question 48: A data terminal serves as an a. Effectors b. Sensor
d. compromise equalizer
c. radio lines
d. any of the above
c. both a and b
d. neither a nor b
Question 49: Which of the following transmission systems provide the highest data rate to in individual device? a. computer bus b. telephone lines c. voice and mode d. lease lines Question 50: A protocol is a set of rules governing a time sequence of events that must take place a. between peers b. between an interface c. between modems d. across an interface
Answers
41. b 46. a 42. A 47. d 43. B 48. C 44. D 49. A 45. A 50. a
51. If a computer on the network shares resources for others to use, it is called ____ a. Server b. Client c. Mainframe Answer : a
52. Terminators are used in ______ topology. a. Bus b. Star Answer : a 53. In _____ topology, if a computer’s network cable is broken, whole network goes down. a. Bus b. Star Answer : a
54 .For large networks, _______ topology is used. a. Bus b. Star c. Ring Answer : b
55. ISO stands for a. International Standard Organization c. Integrated Services Organization
b. International Student Organization Answer : a
56. ISO OSI model is used in a. Stand alone PC b. Network environment
Answer : b
57. Network cable lies on _____ layer a. Application b. Network c. Physical
58. ____ layer decides which physical pathway the data should take. a. Application b. Network c. Physical Answer : c
59. ISDN is an example of ______ network a. Circuit switched b. Packet switched
Answer : a
60. X.25 is an example of ______ network a. Circuit switched b. Packet switched
Answer : b
61. _____________ allows LAN users to share computer programs and data. a. Communication server b. Print server c. File server Answer : c
62. Print server uses ________ which is a buffer that holds data before it is send to the printer.
a. Queue
b. Spool
c. Node
Answer : b
63. A standalone program that has been modified to work on a LAN by including concurrency controls such as file and record locking is an example of____ a. LAN intrinsic software b. LAN aware software c. Groupware d. LAN ignorant software Answer : a
64. The ______ portion of LAN management software restricts access, records user activities and audit data etc. a. Configuration management b. Security management c. Performance management Answer : b
65. What is the max cable length of STP? a. 100 ft b. 200 ft c. 100 m
d. 200 m
Answer : d
66. What is the max data capacity of STP? a. 10 mbps b. 100 mbps c. 1000 mbps d. 10000 mbps Answer : b
67. Which connector STP uses? a. BNC b. RJ-11 c. RJ-45
d. RJ-69
Answer : c
68. What is the central device in star topology? a. STP server b. Hub/switch c. PDC
d. Router
Answer : b
69. What is max data capacity for optical fiber cable? a. 10 mbps b. 100 mbps c. 1000 mbps
d. 10000 mbps
Answer : c
70. Which of the following architecture uses CSMA/CD access method? a. ARCnet b. Ethernet Answer : b
71. Connectivity is a concept related to a. transmitting information, either by computer or by phone b. the interconnections within a computer c. using computer networks to link people and resources d. being in an active session with your computer
72. One of the most dramatic changes in connectivity and communications in the past five years or so has been ____. a. mobile or wireless telephones b. public and private discussion c. satellite uplinks d. running programs on remote computers 72. The four basic elements of any communication system include a. peer-to-peer, videoconferencing, online photo-conferencing, net optical b. sending and receiving devices, communication channel, connection device, and data transmission specifications c. telephone lines, coaxial cables, fibre-optic cables, and communication channel d. software, hardware, communication channel, network 73. These communication devices originate as well as accept messages in the form of data, information, and/or instructions. a. i-drives sending and receiving devices key chain drives optical drives 74. The transmission medium that carries the message is referred to as the a. send and receive device communication channel protocol gateways 75. Data is transmitted using light through a ____ cable. a. twisted pair fiber-optic coaxial microwave 76. Which physical connection is the fastest? a. twisted pair coaxial cable
fiber-optics
microwaves
77 . Which of the following connection methods would not be used to connect devices between two different offices? a. twisted pairs b. fiber-optics c. coaxial cables d. infrared 78. Most Web-enabled devices follow a standard known as a. FireWire b. Bluetooth c. TCP/IP d. Wi-FI 79. This wireless standard is widely used to connect computers to each other and to the Internet. a. 802.11 b. RJ45 c. Blue band d. Broadband 80. These communication devices originate as well as accept messages in the form of data, information, and/or instructions. b. i-drives sending and receiving devices key chain drives optical drives
81. Bluetooth is a type of radio wave information transmission system that is good for about 30 feet 30 yards 30 miles 300 miles
82. A term relating to sending data to a satellite is Uplink downlink modulate
demodulate
83. A credit card-sized expansion board that is inserted into portable computers that connects the PC to the telephone wall jack is called what? Internal modem External modem PC Card modem Wireless modem 84. Standard telephone lines and conventional modems provide what is called a. Bluetooth service b. dial-up service c. wireless service d. Wi-FI service 85. Special high-speed lines used by large corporations to support digital communications are known as a. satellite/air connection service lines b. cable modems c. digital subscriber lines d. T1, T2, T3 and T4 lines 86. The rules for exchanging data between computers are called a. interconnections b. synchronous packages c. protocols d. data transmission synchronization 87. Each computer on the Internet has a unique numeric address called a(n) a. domain address b. protocol address c. IP address d. Web address 88. ____ is the process of breaking down information sent or transmitted across the Internet into small parts called packets. a. protocol b. bandwidth c. reformatting d. identification 89. Two or more computers connected so that they can communicate with each other and share information is called a a. satellite b. protocol c. broadcast d. network 90. Any device that is connected to a network is called a a. client b. node c. server d. manager 91. Which protocol working at the Transport layer provides a connectionless service between hosts? A. IP B. ARP C. TCP D. UDP Answer: D
92. Which protocol works at the Transport layer and provides virtual circuits between hosts? A. IP B. ARP C. TCP D. UDP Answer: C
93. Which protocol works at the Internet layer and provides a connection service between hosts? A. IP B. ARP C. TCP D. UDP Answer: A
94. If a host broadcasts a frame that includes a source and destination hardware address, and its purpose is to assign IP addresses to itself, which protocol at the Network layer does the host use? A. RARP B. ARPA C. ICMP D. TCP E. IPX Answer: A
95. If a router interface is congested, which protocol in the IP suite is used to tell neighbor routers? A. RARP B. ARP C. ICMP D. IP E. TCP Answer: C
96. What is the valid host range the IP address 172.16.10.22 255.255.255.240 is a part of? A. 172.16.10.20 through 172.16.10.22 B. 172.16.10.1 through 172.16.10.255 C. 172.16.10.16 through 172.16.10.23 D. 172.16.10.17 through 172.16.10.31 E. 172.16.10.17 through 172.16.10.30 Answer: E
97. What range of addresses can be used in the first octet of a Class B network address? A. 1–126 B. 1–127 C. 128–190 D. 128–191 E. 129–192 F. 192–220 Answer: D
98. What range of addresses can be used in the first octet of a Class C address? A. 1-127 B. 129-192 C. 203-234 D. 192-223 Answer: D
99. How many bytes is an Ethernet address? A. 3 B. 4 C. 5
D. 6
E. 7
F. 8
G. 16 Answer: D
100. What protocol is used to find the hardware address of a local device? A. RARP B. ARP C. IP D. ICMP E. BootP
Answer: B
101. Which of the following is the broadcast address for a Class B network ID using the default subnet mask? A. 172.16.10.255 B. 172.16.255.255 C. 172.255.255.255 D. 255.255.255.255 Answer: B
102. Which class of IP address provides a maximum of only 254 host addresses per network ID? A. A B. B C. C D. D E. E Answer: C
103. What is the broadcast address of the subnet address 10.254.255.19 255.255.255.248?
A. 10.254.255.23 Answer: A
B. 10.254.255.24
C. 10.254.255.255
D. 10.255.255.255
104. What is the broadcast address of the subnet address 172.16.99.99 255.255.192.0? A. 172.16.99.255 B. 172.16.127.255 C. 172.16.255.255 D. 172.16.64.127 Answer: B
105. If you wanted to have 12 subnets with a Class C network ID, which subnet mask would you use? A. 255.255.255.252 B. 255.255.255.248 C. 255.255.255.240 D. 255.255.255.255 Answer: C
106. What is the port number range that a transmitting host can use to set up a session with another host? A. 1–1023 B. 1024 and above C. 1–256 D. 1–65534 Answer: B
107. Which of the following ranges are considered well-known port numbers? A. 1–1023 B. 1024 and above C. 1–256 D. 1–65534 Answer: A
108. What is the broadcast address of the host subnet address 10.10.10.10 255.255.254.0? A. 10.10.10.255 B. 10.10.11.255 C. 10.10.255.255 D. 10.255.255.255 Answer: B
109. What broadcast address will the host 192.168.210.5 255.255.255.252 use? A. 192.168.210.255 B. 192.168.210.254 C. 192.168.210.7 D. 192.168.210.15 Answer: C
110.If you need to have a Class B network address sub netted into exactly 510 subnets, what subnet mask would you assign? A. 255.255.255.252 B. 255.255.255.128 C. 255.255.0.0 D. 255.255.255.192 Answer: B
111. Which protocol is used to look up an IP address from a known Ethernet address? A. IP B. ARP C. RARP D. TCP Answer: C
112. What is the subnet address of the IP address 192.168.100.30 255.255.255.248? A. 192.168.100.32 B. 192.168.100.24 C. 192.168.100.0 D. 192.168.100.16
Answer: B
113. Which of the following is the valid host range for the IP address 192.168.168.188 255.255.255.192? A. 192.168.168.129-190 B. 192.168.168.129-191 C. 192.168.168.128-190 D. 192.168.168.128-192 Answer: A
114. What is the broadcast address of the subnet address 192.168.99.20 255.255.255.252? A. 192.168.99.127 B. 192.168.99.63 C. 192.168.99.23 D. 192.168.99.31 Answer: C
115. What is the valid host range that the host ID 192.168.10.33 255.255.255.224 is a part of? A. 192.168.10.32-63 B. 192.168.10.33-63 C. 192.168.10.33-62 D. 192.168.10.33-61 Answer: C
116. Which protocol does DHCP use at the Transport layer? A. IP B. TCP C. UDP D. ARP Answer: C
117. Which of the following is the valid host range for the IP address 192.168.168.188 255.255.255.192? A. 192.168.168.129-190 B. 192.168.168.129-191 C. 192.168.168.128-190 D. 192.168.168.128-192 Answer: A
118. Which protocol is used to find an Ethernet address from a known IP address? A. IP B. ARP C. RARP D. BootP Answer: B
119. Which class of IP address has the most host addresses available by default? A. A B. B C. C D. A and B Answer: A
120. Which protocol does Ping use? A. TCP B. ARP C. ICMP
D. BootP
Answer: C
121. Which protocol is used to send a Destination Network Unknown message back to originating hosts? A. TCP B. ARP C. ICMP D. BootP Answer: C
122. What is the subnet broadcast address the host 192.168.10.17 with four bits of sub netting will use? A. 192.168.10.16 B. 192.168.10.19 C. 192.168.10.23 D. 192.168.10.31 Answer: D
123. What is the subnet broadcast address the host 172.16.10.12 with nine bits of sub netting will use? A. 172.16.10.127 B. 172.16.10.255 C. 172.16.255.255 D. 172.16.10.128 Answer: A
124.. What is the valid host range of the IP subnet address 172.16.10.61 255.255.255.224? A. 172.16.10.48-63 B. 172.16.10.33-62 C. 172.16.10.0-254 D. 172.16.10.60-94 Answer: B
125. What protocol is used to resolve an Ethernet address to an IP address? A. IP B. ARP C. RARP D. BootP Answer: C 126. What protocol is used to resolve an IP address to an Ethernet address? A. IP B. ARP C. RARP D. BootP Answer: B 127. A router: a. forwards a packet to the next free outgoing link. b. forwards a packet to all outgoing links, except the link upon which the packet originated. c. determines on which outgoing link a packet is to be forwarded. d. forwards a packet to all outgoing links. 128. The Internet is an example of a: a. packet switched network.
b. cell switched network. c. circuit switched network. 129. Baseband transmission may be defined as the transmission of a signal over a link: a. without any change in frequency. b. at a different band of frequencies. c. by means of wires. d. which is relatively short. 130. Manchester encoding is principally designed to: a. increase the bandwidth of a signal transmitted on the medium. b. ensure that a transition occurs in the centre of each bit period. c. have more than one symbol per bit period. d. ensure that the line remains unbalanced.
Question 1: In OSI network architecture, the dialogue control and token management are responsibility of a. session layer b. network layer c. transport layer d. data link layer e. none of above Question 2: In OSI network architecture, the routing is performed by a. network layer b. data link layer c. transport layer Question 3: Which of the following performs modulation and demodulation? a. fibre optics b. Satellite c. coaxial cable
d. session layer
e. none of above
d. Modem
e. none of the above
Question 4: The process of converting analogue signals into digital signals so they can be processed by a receiving computer is referred to as: a. modulation b. Demodulation c. Synchronizing d. Digitising Question 5: How many OSI layers are covered in the X.25 standard? a. Two b. Three c. Seven d. Six Question 6: Layer one of the OSI model is a. physical layer b. link layer Question 7: The x.25 standard specifies a a. technique for start-stop data d. data bit rate
e. None of above
c. transport layer
d. network layer
e. none of above
b. technique for dial access e. none of above
c. DTE/DCE interface
Question 8: Which of the following communication modes support two-way traffic but in only one direction at a time? a. simplex b. half duplex c. three-quarters duplex d. all of the above e. none of the above Question 9: Which of the following might be used by a company to satisfy its growing communications needs? a. front end processor b. Multiplexer c. Controller d. Concentrator e. all of the above Question 10: What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard? a. 4 b. 2 c. 6 d. 3 e. none of the above
Correct Answers:
1. a 6. a 2. a 7. c 3. d 8. B 4. d 9. E 5. B 10. d
Question 11: The interactive transmission of data within a time sharing system may be best suited to a. simplex lines b. half-duplex lines c. full duplex lines d. diplex-lines Question 12: Which of the following statement is incorrect? a. The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission. b. Half duplex line is a communication line in which data can move in two directions, but not at the same time. c. Teleprocessing combines telecommunications and DP techniques in online activities d. Batch processing is the preferred processing mode for telecommunication operation. Question 13: Which of the following is considered a broad band communication channel? a. coaxial cable b. fibre optics cable c. microwave circuits Question 14: Which of the following is not a transmission medium? a. telephone lines b. coaxial cables c. Modem
d. all of above
d. microwave systems
Question 15: Which of the following does not allow multiple uses or devices to share one communication line? a. doubleplexer b. Multiplexer c. Concentrator d. controller Question 16: Which of the following signal is not standard RS-232-C signal? a. VDR b. RTS c. CTS d. DSR Question 17: Which of the following statement is incorrect? a. Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line b. HDLC is a standard synchronous communication protocol. c. RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data d. RTS/CTS is the way the terminal indicates ringing Question 18: Which of the following is an advantage to using fiber optics data transmission? a. resistance to data theft b. fast data transmission rate c. low noise level
d. all of above
Question 19: Which of the following is required to communicate between two computers? a. communications software b. Protocol c. communication hardware d. all of above including access to transmission medium Question 20: The transmission signal coding method of TI carrier is called a. Bipolar b. NRZ c. Manchester d. Binary
Answers:
11. b 12. D 13. D 14. C 15. A 16. A 17. d 18. d 19. D 20. a Question 21: Which data communication method is used to transmit the data over a serial communication link? a. simplex b. half-duplex c. full-duplex d. b and c e. None of above
Question 22: What is the minimum number of wires needed to send data over a serial communication link layer? a. 1 b. 2 c. 4 d. 6 e. none of above Question 23: Which of the following types of channels moves data relatively slowly? a. wide band channel b. voice band channel c. narrow band channel Question 24: Most data communications involving telegraph lines use: a. simplex lines b. wideband channel c. narrowband channel
d. dialled service
Question 25: A communications device that combines transmissions from several I/O devices into one line is a a. concentrator b. Modifier c. Multiplexer d. full-duplex line
Question 26: How much power (roughly) a light emitting diode can couple into an optical fibre? a. 100 microwatts b. 440 microwatts c. 100 kilowatts d. 10 miliwatts Question 27: The synchronous modems are more costly than the asynchronous modems because a. they produce large volume of data b. they contain clock recovery circuits c. they transmit the data with stop and start bits d. they operate with a larger bandwidth e. none of above Question 28: Which of the following statement is correct? a. terminal section of a synchronous modem contains the scrambler b. receiver section of a synchronous modem contains the scrambler c. transmission section of a synchronous modem contains the scrambler d. control section of a synchronous modem contains the scrambler e. none of the above Question 29: In a synchronous modem, the digital-to-analogue converter transmits signal to the a. equalizer b. Modulator c. Demodulator d. Terminal e. none of above Question 30: Which of the following communications lines is best suited to interactive processing applications? a. narrow band channel b. simplex lines c. full duplex lines d. mixed band channels
Answers
21. c 22. B 23. C 24. C 25. C 26. a
27. b
28. C
29. A
30. c
Question:31 A remote batch-processing operation in which data is solely input to a central computer would require a. telegraph line b. simplex lines c. mixed bad channel d. all of above
Question 32: A band is always equivalent to a. a byte b. a bit
c. 100 bits
d. none of above
Question 33: The loss in signal power as light travels down the fibre is called a. attenuation b. Progration c. Scattering
d. interruption
Question 34: Avalanche photodiode receivers can detect bits of transmitted data by receiving a. 100 photons b. 200 photons c. 2000 photons d. 300 photons
Question 35: Communication circuits that transmit data in both directions but not at the same time are operating in a. a simplex mode b. a half duplex mode c. a full duplex mode d. an asynchronous mode
Question 36: An example of a medium speed, switched communications service is a. series 1000 b. data phone 50 c. DDD d. All of the above
Question 37: In communication satellite, multiple repeaters are known as a. detector b. Modulator c. Stations
d. transponders
Question 38: While transmitting odd-parity coded symbols, the number of zeros in each symbol is a. odd b. Even c. a and b both d. unknown
Question 39: Data communications monitors available on the software marked include a. ENVIRON/1 b. TOTAL c. BPL d. Telnet
Question 40: An example of an analogue communication method is a. laser beam b. Microwave c. voice grade telephone line
d. all of the above
Answers
31. b 36. c 32. D 37. d 33. A 38. D 34. B 39. A 35. B 40. d
Question:41 Number of bits per symbol used in Baud code is a. 7 b. 5 c. 8 d. 9 Question 42:
What is the main difference between DDCMP and SDLC? a. DDCMP does not need special hardware to final the beginning of a message b. DDCMP has a message header c. SDLC has a IP address d. SDLC does not use CRC Question 43: An example of digital, rather than analogue, communication is a. DDD b. DDS c. WATS d. DDT Question 44: Terminals are required for a. real-time, batch processing & time-sharing b. real time, time-sharing & distributed message processing c. real time, distributed processing & manager inquiry d. real-time, time sharing & message switching Question 45: The receive equalizer reduces delay distortions using a a. tapped delay lines b. Gearshift
c. Descrambler
d. difference engine
Question 46: Ina synchronous modem, the receive equalizer is known as a. adaptive equalizer b. impairment equalizer c. Statistical equalizer Question 47: The channel in the data communication model can be a. postal mail services b. telephone lines Question 48: A data terminal serves as an a. Effectors b. Sensor
d. compromise equalizer
c. radio lines
d. any of the above
c. both a and b
d. neither a nor b
Question 49: Which of the following transmission systems provide the highest data rate to in individual device? a. computer bus b. telephone lines c. voice and mode d. lease lines Question 50: A protocol is a set of rules governing a time sequence of events that must take place a. between peers b. between an interface c. between modems d. across an interface
Answers
41. b 46. a 42. A 47. d 43. B 48. C 44. D 49. A 45. A 50. a
51. If a computer on the network shares resources for others to use, it is called ____ a. Server b. Client c. Mainframe Answer : a
52. Terminators are used in ______ topology. a. Bus b. Star Answer : a 53. In _____ topology, if a computer’s network cable is broken, whole network goes down. a. Bus b. Star Answer : a
54 .For large networks, _______ topology is used. a. Bus b. Star c. Ring Answer : b
55. ISO stands for a. International Standard Organization c. Integrated Services Organization
b. International Student Organization Answer : a
56. ISO OSI model is used in a. Stand alone PC b. Network environment
Answer : b
57. Network cable lies on _____ layer a. Application b. Network c. Physical
58. ____ layer decides which physical pathway the data should take. a. Application b. Network c. Physical Answer : c
59. ISDN is an example of ______ network a. Circuit switched b. Packet switched
Answer : a
60. X.25 is an example of ______ network a. Circuit switched b. Packet switched
Answer : b
61. _____________ allows LAN users to share computer programs and data. a. Communication server b. Print server c. File server Answer : c
62. Print server uses ________ which is a buffer that holds data before it is send to the printer.
a. Queue
b. Spool
c. Node
Answer : b
63. A standalone program that has been modified to work on a LAN by including concurrency controls such as file and record locking is an example of____ a. LAN intrinsic software b. LAN aware software c. Groupware d. LAN ignorant software Answer : a
64. The ______ portion of LAN management software restricts access, records user activities and audit data etc. a. Configuration management b. Security management c. Performance management Answer : b
65. What is the max cable length of STP? a. 100 ft b. 200 ft c. 100 m
d. 200 m
Answer : d
66. What is the max data capacity of STP? a. 10 mbps b. 100 mbps c. 1000 mbps d. 10000 mbps Answer : b
67. Which connector STP uses? a. BNC b. RJ-11 c. RJ-45
d. RJ-69
Answer : c
68. What is the central device in star topology? a. STP server b. Hub/switch c. PDC
d. Router
Answer : b
69. What is max data capacity for optical fiber cable? a. 10 mbps b. 100 mbps c. 1000 mbps
d. 10000 mbps
Answer : c
70. Which of the following architecture uses CSMA/CD access method? a. ARCnet b. Ethernet Answer : b
71. Connectivity is a concept related to a. transmitting information, either by computer or by phone b. the interconnections within a computer c. using computer networks to link people and resources d. being in an active session with your computer
72. One of the most dramatic changes in connectivity and communications in the past five years or so has been ____. a. mobile or wireless telephones b. public and private discussion c. satellite uplinks d. running programs on remote computers 72. The four basic elements of any communication system include a. peer-to-peer, videoconferencing, online photo-conferencing, net optical b. sending and receiving devices, communication channel, connection device, and data transmission specifications c. telephone lines, coaxial cables, fibre-optic cables, and communication channel d. software, hardware, communication channel, network 73. These communication devices originate as well as accept messages in the form of data, information, and/or instructions. a. i-drives sending and receiving devices key chain drives optical drives 74. The transmission medium that carries the message is referred to as the a. send and receive device communication channel protocol gateways 75. Data is transmitted using light through a ____ cable. a. twisted pair fiber-optic coaxial microwave 76. Which physical connection is the fastest? a. twisted pair coaxial cable
fiber-optics
microwaves
77 . Which of the following connection methods would not be used to connect devices between two different offices? a. twisted pairs b. fiber-optics c. coaxial cables d. infrared 78. Most Web-enabled devices follow a standard known as a. FireWire b. Bluetooth c. TCP/IP d. Wi-FI 79. This wireless standard is widely used to connect computers to each other and to the Internet. a. 802.11 b. RJ45 c. Blue band d. Broadband 80. These communication devices originate as well as accept messages in the form of data, information, and/or instructions. b. i-drives sending and receiving devices key chain drives optical drives
81. Bluetooth is a type of radio wave information transmission system that is good for about 30 feet 30 yards 30 miles 300 miles
82. A term relating to sending data to a satellite is Uplink downlink modulate
demodulate
83. A credit card-sized expansion board that is inserted into portable computers that connects the PC to the telephone wall jack is called what? Internal modem External modem PC Card modem Wireless modem 84. Standard telephone lines and conventional modems provide what is called a. Bluetooth service b. dial-up service c. wireless service d. Wi-FI service 85. Special high-speed lines used by large corporations to support digital communications are known as a. satellite/air connection service lines b. cable modems c. digital subscriber lines d. T1, T2, T3 and T4 lines 86. The rules for exchanging data between computers are called a. interconnections b. synchronous packages c. protocols d. data transmission synchronization 87. Each computer on the Internet has a unique numeric address called a(n) a. domain address b. protocol address c. IP address d. Web address 88. ____ is the process of breaking down information sent or transmitted across the Internet into small parts called packets. a. protocol b. bandwidth c. reformatting d. identification 89. Two or more computers connected so that they can communicate with each other and share information is called a a. satellite b. protocol c. broadcast d. network 90. Any device that is connected to a network is called a a. client b. node c. server d. manager 91. Which protocol working at the Transport layer provides a connectionless service between hosts? A. IP B. ARP C. TCP D. UDP Answer: D
92. Which protocol works at the Transport layer and provides virtual circuits between hosts? A. IP B. ARP C. TCP D. UDP Answer: C
93. Which protocol works at the Internet layer and provides a connection service between hosts? A. IP B. ARP C. TCP D. UDP Answer: A
94. If a host broadcasts a frame that includes a source and destination hardware address, and its purpose is to assign IP addresses to itself, which protocol at the Network layer does the host use? A. RARP B. ARPA C. ICMP D. TCP E. IPX Answer: A
95. If a router interface is congested, which protocol in the IP suite is used to tell neighbor routers? A. RARP B. ARP C. ICMP D. IP E. TCP Answer: C
96. What is the valid host range the IP address 172.16.10.22 255.255.255.240 is a part of? A. 172.16.10.20 through 172.16.10.22 B. 172.16.10.1 through 172.16.10.255 C. 172.16.10.16 through 172.16.10.23 D. 172.16.10.17 through 172.16.10.31 E. 172.16.10.17 through 172.16.10.30 Answer: E
97. What range of addresses can be used in the first octet of a Class B network address? A. 1–126 B. 1–127 C. 128–190 D. 128–191 E. 129–192 F. 192–220 Answer: D
98. What range of addresses can be used in the first octet of a Class C address? A. 1-127 B. 129-192 C. 203-234 D. 192-223 Answer: D
99. How many bytes is an Ethernet address? A. 3 B. 4 C. 5
D. 6
E. 7
F. 8
G. 16 Answer: D
100. What protocol is used to find the hardware address of a local device? A. RARP B. ARP C. IP D. ICMP E. BootP
Answer: B
101. Which of the following is the broadcast address for a Class B network ID using the default subnet mask? A. 172.16.10.255 B. 172.16.255.255 C. 172.255.255.255 D. 255.255.255.255 Answer: B
102. Which class of IP address provides a maximum of only 254 host addresses per network ID? A. A B. B C. C D. D E. E Answer: C
103. What is the broadcast address of the subnet address 10.254.255.19 255.255.255.248?
A. 10.254.255.23 Answer: A
B. 10.254.255.24
C. 10.254.255.255
D. 10.255.255.255
104. What is the broadcast address of the subnet address 172.16.99.99 255.255.192.0? A. 172.16.99.255 B. 172.16.127.255 C. 172.16.255.255 D. 172.16.64.127 Answer: B
105. If you wanted to have 12 subnets with a Class C network ID, which subnet mask would you use? A. 255.255.255.252 B. 255.255.255.248 C. 255.255.255.240 D. 255.255.255.255 Answer: C
106. What is the port number range that a transmitting host can use to set up a session with another host? A. 1–1023 B. 1024 and above C. 1–256 D. 1–65534 Answer: B
107. Which of the following ranges are considered well-known port numbers? A. 1–1023 B. 1024 and above C. 1–256 D. 1–65534 Answer: A
108. What is the broadcast address of the host subnet address 10.10.10.10 255.255.254.0? A. 10.10.10.255 B. 10.10.11.255 C. 10.10.255.255 D. 10.255.255.255 Answer: B
109. What broadcast address will the host 192.168.210.5 255.255.255.252 use? A. 192.168.210.255 B. 192.168.210.254 C. 192.168.210.7 D. 192.168.210.15 Answer: C
110.If you need to have a Class B network address sub netted into exactly 510 subnets, what subnet mask would you assign? A. 255.255.255.252 B. 255.255.255.128 C. 255.255.0.0 D. 255.255.255.192 Answer: B
111. Which protocol is used to look up an IP address from a known Ethernet address? A. IP B. ARP C. RARP D. TCP Answer: C
112. What is the subnet address of the IP address 192.168.100.30 255.255.255.248? A. 192.168.100.32 B. 192.168.100.24 C. 192.168.100.0 D. 192.168.100.16
Answer: B
113. Which of the following is the valid host range for the IP address 192.168.168.188 255.255.255.192? A. 192.168.168.129-190 B. 192.168.168.129-191 C. 192.168.168.128-190 D. 192.168.168.128-192 Answer: A
114. What is the broadcast address of the subnet address 192.168.99.20 255.255.255.252? A. 192.168.99.127 B. 192.168.99.63 C. 192.168.99.23 D. 192.168.99.31 Answer: C
115. What is the valid host range that the host ID 192.168.10.33 255.255.255.224 is a part of? A. 192.168.10.32-63 B. 192.168.10.33-63 C. 192.168.10.33-62 D. 192.168.10.33-61 Answer: C
116. Which protocol does DHCP use at the Transport layer? A. IP B. TCP C. UDP D. ARP Answer: C
117. Which of the following is the valid host range for the IP address 192.168.168.188 255.255.255.192? A. 192.168.168.129-190 B. 192.168.168.129-191 C. 192.168.168.128-190 D. 192.168.168.128-192 Answer: A
118. Which protocol is used to find an Ethernet address from a known IP address? A. IP B. ARP C. RARP D. BootP Answer: B
119. Which class of IP address has the most host addresses available by default? A. A B. B C. C D. A and B Answer: A
120. Which protocol does Ping use? A. TCP B. ARP C. ICMP
D. BootP
Answer: C
121. Which protocol is used to send a Destination Network Unknown message back to originating hosts? A. TCP B. ARP C. ICMP D. BootP Answer: C
122. What is the subnet broadcast address the host 192.168.10.17 with four bits of sub netting will use? A. 192.168.10.16 B. 192.168.10.19 C. 192.168.10.23 D. 192.168.10.31 Answer: D
123. What is the subnet broadcast address the host 172.16.10.12 with nine bits of sub netting will use? A. 172.16.10.127 B. 172.16.10.255 C. 172.16.255.255 D. 172.16.10.128 Answer: A
124.. What is the valid host range of the IP subnet address 172.16.10.61 255.255.255.224? A. 172.16.10.48-63 B. 172.16.10.33-62 C. 172.16.10.0-254 D. 172.16.10.60-94 Answer: B
125. What protocol is used to resolve an Ethernet address to an IP address? A. IP B. ARP C. RARP D. BootP Answer: C 126. What protocol is used to resolve an IP address to an Ethernet address? A. IP B. ARP C. RARP D. BootP Answer: B 127. A router: a. forwards a packet to the next free outgoing link. b. forwards a packet to all outgoing links, except the link upon which the packet originated. c. determines on which outgoing link a packet is to be forwarded. d. forwards a packet to all outgoing links. 128. The Internet is an example of a: a. packet switched network.
b. cell switched network. c. circuit switched network. 129. Baseband transmission may be defined as the transmission of a signal over a link: a. without any change in frequency. b. at a different band of frequencies. c. by means of wires. d. which is relatively short. 130. Manchester encoding is principally designed to: a. increase the bandwidth of a signal transmitted on the medium. b. ensure that a transition occurs in the centre of each bit period. c. have more than one symbol per bit period. d. ensure that the line remains unbalanced.
