2. How many digits of the DNIC (Data Network Identification Code) identify the country? A. first B. first two C. first three D.

Transcription

1 1. What device separates a single network into two segments but lets the two segments appear as one to higher protocols? A. Switch B. Bridge C. Router D. Gateway 2. How many digits of the DNIC (Data Network Identification Code) identify the country? A. first B. first two C. first three D. first four 3. A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used? A. flooding B. delta routing C. static routing D. hot potato routing 4. Frames from one LAN can be transmitted to another LAN via the device A. Bridge B. Router C. Modem D. Repeater 5. Which of the following condition is used to transmit two packets over a medium at the same time? A. Collision B. Contention C. Synchronous D. Asynchronous 6. The houses the switches in token ring. A. NIC B. MAU

2 C. transceiver D. nine-pin connector 7. The packets switching concept was first proposed A. in the late 1950s for Defense Ministry of US B. in the late 1980s for the Defense Ministry of US C. in the early 1960s for military communication systems, mainly to handle speech D. All of the above 8. Telecommunication networks frequently interconnect an organization with its customers and suppliers. Select the best fit for answer: A. Extranets B. Switching alternating C. Bandwidth alternatives D. Inter organizational networks 9. The geostationary satellite used for communication systems A. rotates with the earth B. is positioned over equator C. remains stationary relative to the earth D. All of the above 10. You have a class A network address with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Whi A B C D

3 11. What are the most commonly used transmission speeds in BPS used in data communication? A. 500 B C D What is the default subnet mask for a class C network? A B C D Which of the following is used for modulation and demodulation? A. modem B. gateway C. protocols D. multiplexer 14. Which of the following is not a disadvantage of wireless LAN? A. interference of transmissions from different B. slower data transmission computers C. higher error rate D. all of the above 15. Which of the following does not allow multiple users or devices to share one communications line? A. controller B. concentrator C. doubleplexer D. multipplexer 16. Which of the following is required to communicate between two computers? A. protocol B. communications software

4 C. communications hardware D. all of the above 17. Which of the following types of channels moves data relatively slowly? A. wideband channel B. voiceband channel C. broadband channel D. narrowband channel 18. With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts? A. 222 B. 233 C. 241 D How many bits internet address is assigned to each host on a TCP/IP internet which is used in all communications with the host? A bits B bits C bits D bits 20. The Internet Control Message Protocol (ICMP) A. reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem B. provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another C. allows gateways to send error a control messages to other gateways or hosts D. All of the above 21. Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing

5 plant in the suburbs. To enable everyone to share data and resources between the two LANs, name the device A. Hub B. Cable C. Router D. Modem 22. The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver A. cannot talk at once B. can send or receive data one at a time C. can do one way data transmission only D. can receive and send data simultaneously 23. How many hosts are attached to each of the local area networks at your site? A. 64 B. 128 C. 254 D Which of the following technique is used for fragment? A. one of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size B. a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame C. a technique used in best-effort delivery systems to avoid endlessly looping packets D. all of the above 25. Internet-like networks within an enterprise called - A. Intranets B. Extranets C. Switching alternating D. Inter organizational networks 26. To connect a computer with a device in the same room, you might be likely to use

6 A. a coaxial cable B. a ground station C. a dedicated line D. all of the above 27. Usually, it takes 10-bits to represent one character. How many characters can be transmitted at a speed of 1200 BPS? A. 12 B. 120 C D Eight stations are competing for the use of a shared channel using the 'Adaptive tree Walk Protocol'. If the stations 7 and 8 are suddenly become ready at once, how many bit slots - A. 3 slots B. 5 slots C. 7 slots D. 9 slots 29. What is the port number for NNTP? A. 70 B. 79 C. 87 D Contention is A. a continuous frequency capable of being modulated or impressed with a second signal B. the condition when two or more stations attempt to use the same channel at the same time C. one or more conductors that serve as a common connection for a related group of devices D. a collection of interconnected functional units that provides a data communications service among stations attached to the network 31. Avalanche photodiode receivers can detect hits of transmitted data by receiving

7 A. 100 photons B. 200 photons C. 300 photons D. 400 photons 32. Satellite-Switched Time-Division Multiple Access (SS/TDMA) is A. a form of TDMA in which circuit switching is B. the method of determining which device has used to dynamically change the channel assignments access to the transmission medium at any time C. a medium access control technique for multiple access transmission media D. all of the above 33. When you ping the loopback address, a packet is sent where? A. On the network B. Across the wire C. Through the loopback dongle D. Down through the layers of the IP architecture and then up the layers again 34. Which of the following TCP/IP protocol is used for transferring electronic mail messages from one machine to another? A. FTP B. RPC C. SNMP D. SMTP 35. A front-end processor is A. a user computer system B. preliminary processor of batch jobs C. a processor in a large-scale computer that executes operating system instructions D. a minicomputer that relieves main-frame computers at a computer centre of communications control functions 36. Which of the following statements is correct for the use of packet switching?

8 A. the employment of additional intelligence within the network enabled more sophisticated error control and link control procedures to be applied C. the subdivision of information into individually addressed packets in conjunction with alternative routing arrangement enabled the transmission path to be altered in the event of congestion or individual link failure B. by employing wide bandwidth circuits for the trunk networks substantial economies through extensive sharing of capacity could be achieved D. all of the above 37. In CRC there is no error if the remainder at the receiver is. A. zero B. non-zero C. the quotient at the sender D. equal to the remainder at the sender 38. What can greatly reduce TCP/IP configuration problems? A. PDC B. WINS Proxy C. WINS Server D. DHCP Server 39. Carrier is A. a continuous frequency capable of being modulated or impressed with a second signal B. the condition when two or more sections attempt to use the same channel at the same time C. one or more conductors that serve as a common connection for a related group of devices D. a collection of interconnected functional units that provides a data communications service among stations attached to the network

9 40. Which of the following device is used to connect two systems, especially if the systems use different protocols? A. hub B. bridge C. gateway D. repeater 41. 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 operate with a larger bandwidth D. they transmit the data with stop and start bits 42. A distributed network configuration in which all data/information pass through a central computer is A. bus network B. star network C. ring network D. Point-to-point network 43. Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine? A. X.25 B. UDP C. SMTP D. VMTP 44. A remote batch-processing operation in which data is solely input to a central computer would require a: A. simplex lines B. telegraph line C. mixedband channel D. all the above 45. A noiseless 3 KHz Channel transmits bits with binary level signals. What is the maximum data rate?

10 A. 6 Kbps B. 12 Kbps C. 24 Kbps D. 48 Kbps 46. The slowest transmission speeds are those of A. microwaves B. coaxial cable C. fiber-optic cable D. twisted-pair wire 47. What part of is the Network ID, assuming a default subnet mask? A. 51 B. 192 C D If you get both local and remote echoes, every character you type will appear on the screen A. once B. twice C. three times D. never 49. ICMP (Internet Control Message Protocol) is A. a protocol used to monitor computers B. a protocol that handles error and control messages C. a TCP/IP high level protocol for transferring files from one machine to another D. a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address 50. Which of the following refers to the terms "residual error rate"? A. signal to noise ratio divided by the ratio of B. the number of bit errors per twenty four

11 energy per bit to noise per hertz C. the probability that one or more errors will be detected when an error detection mechanism is used hours of continuous operation on an asynchronous line D. the probability that one or more errors will be undetected when an error detection scheme is used 51. Which of the following summation operations is performed on the bits to check an errordetecting code? A. Codec B. Checksum C. Attenuation D. Coder-decoder 52. Select the correct statement about broadband and baseband. A. Baseband refers to local area networks, and broadband refers to wide area networks. B. Baseband operates at a standard bit rate, whereas broadband may operate at different rates as needed C. Baseband networks carry a single channel on a single cable, whereas broadband networks carry several channels on a single cable D. Broadband networks carry several channels on a single cable, whereas in a baseband network several cables carry one channel 53. An error-detecting code inserted as a field in a block of data to be transmitted is known as A. Checksum B. flow control C. Error detecting code D. Frame check sequence 54. The cheapest modems can transmit A. 100 bits per second B. 300 bits per second C. 600 bits per second D. 900 bits per second

12 55. Intranets and extranets can use their network fire walls and other security features to establish secure Internet links within an enterprise or with its trading partners. Select the best fit for answe A. OSI B. Network Server C. Virtual Private Network D. Network operating system 56. Error rate is A. the ratio of the number of data units in error to the total number of data units C. an error-detecting code based on a summation operation performed on the bits to be checked B. a check bit appended to an array of binary digits to make the sum of all the binary digits D. a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the errors is detected 57. Which address is the loopback address? A B C D If a firm wanted to transmit data from 1,000 punched cards to a remote computer, they would use a(n) A. POS termina B. intelligent terminal C. data collection terminal D. batch processing terminal 59. Which network topology is considered passive? A. Bus B. Star C. Ring D. Cross

13 60. Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device A. Modem B. Interface C. Attenuation D. Teleprocessor 61. What is the usual number of bits transmitted simultaneously in parallel data transmission used by microcomputers? A. 4 B. 9 C. 12 D The receive equalizer reduces delay distortions using a A. gearshift B. descrambler C. difference engine D. tapped delay lines 63. Four routers have to be interconnected in a point-to-point Network. Each pair of root us may connected by a high-speed line, a medium speed line or a low speed line. Find the total number of topologie A. 12 B. 48 C. 88 D A network consists of eight NT servers. You are planning to move servers to different segments of your network, what utility should be used at each server to determine which server generates the most A. ARP.EXE B. NETSTAT.EXE

14 C. Network Monitor D. Performance Monitor 65. When the computer provides the manager with a multiple choice of possible answers, the prompting technique is A. form filling B. menu selection C. question and answer D. open-ended question 66. Error detection at a data link level is achieved by A. bit stuffing B. equalization C. Hamming codes D. cyclic redundancy codes 67. If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is A bands B bands C bands D bands 68. A machine that connects to two or more electronic mail systems and transfers mail messages among them is known as A. bridges B. User Agent C. Gateways D. mail gateway 69. Sending a file from your personal computer's primary memory or disk to another computer is called A. hang on B. uploading

15 C. logging on D. downloading 70. What is the name of the software package that allows people to send electronic mail along a network of computers and workstations? A. Electronic mail package B. Memory resident package C. Project management package D. Data communication package 71. The communication mode that supports two-way traffic but only one direction at a time is A. simplex B. duplex C. half duplex D. multiplex 72. HMP (Host Monitoring Protocol) is: A. a protocol used to monitor computers B. a protocol that handles error and control messages C. a TCP/IP high level protocol for transferring files from one machine to another D. a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address 73. Which of the following is a voice band channel? A. Coaxial cable B. Telephone line C. Telegraph line D. Microwave systems 74. You are working with three networks that have the network IDs , , and What subnet mask can you use to combine these addresses into one?

16 A B C D Which of the following technique is used for encapsulation? A. one of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size B. a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame C. a technique used in best-effort delivery systems to avoid endlessly looping packets D. all of the above 76. On a class B network, how many hosts are available at each site with a subnet mask of 248? A. 2,046 B. 4,094 C. 8,190 D. 16, What are the data transmission channels available for carrying data from one location to another? A. Voiceband B. Broadband C. Narrowband D. All of the above 78. Devices interconnected by the LAN should include A. mass storage device, printers and plotters B. computers and terminals C. bridges and gateways D. all of the above

17 79. A 8-Mbps token ring has a token holding timer value of 10 msec. What is the longest frame (assume header bits are negligible) that can be sent on this ring? A. 8,000 B frame B. 10,000 B frame C. 50,000 B frame D. 80,000 B frame 80. Data are sent over pin of the EIA-232 interface. A. 1 B. 2 C. 3 D To connect a computer with a device in the same room, you might be likely to use A. a coaxial cable B. a dedicated line C. a ground station D. all of the above 82. Demodulation is a process of A. performing data description B. converting analog to digital signals C. converting digital to analog signals D. multiplexing various signals into one high speed line signals 83. Internet-like networks between a company and its business partners. Select the best fit for answer: A. Extranets B. Switching alternating C. Bandwidth alternatives D. Inter organizational networks 84. Modulation is the process of

18 A. performing data encryption B. converting digital signals to analog signals C. converting analog signals to digital signals D. multiplexing various signals into high speed line signals 85. Which of the following best illustrates the default subnet mask for a class A,B, and C Network? A , , B , , C , , D , , You are working with a network that has the network ID What subnet should you use that supports up to 25 hosts and a maximum number of subnets? A B C D Which of the following statement is incorrect? A. The sender's IP - to- physical address bindingb. The Addresses Resolution Protocol, ARP, is included in every ARP broadcast; receivers update the IP-to-Physical address binding information in their cache before processing an ARP packet. allows a host to find the physical address of a target host on the same physical network, given only the target IP address. C. ARP is a low-level protocol that hides the underlying network physical addressing, permitting us to assign IP-addresses of our choice to every machine. D. All of the above 88. Demodulation is the process of A. converting digital signals to analog signals B. converting analog signals to digital signals C. dividing the high-speed signals into D. combining many low speed channels into one

19 frequency bands high speed channel 89. An example of an analog communication method is A. voice grade telephone line B. laser beam C. microwave D. all of the above 90. Which of the following layer protocols are responsible for user and the application programme support such as passwords, resource sharing, file transfer and network management? A. Layer 2 protocols B. Layer 5 protocols C. Layer 7 protocols D. Layer 10 protocols 91. What frequency range is used for FM radio transmission? A. Very Low Frequency : 3 khz to 30. khz B. Low Frequency : 30 khz to 300 khz C. High Frequency : 3 MHz to 30 MHz D. Very High Frequency : 30 MHz to 300 MHz 92. Transmission of computerised data from one location to another is called A. data flow B. data transfer C. data management D. data communication 93. Compared to analog signals, digital signals A. are more accurate B. allow faster transmission C. both (a) and (b) D. all of the above

20 94. HOSTS file entries are limited to how many characters? A. 32 B. 255 C. 926 D. Unlimited 95. If delays are recorded as 10 bit numbers in a 50 router network, and delay vectors are exchanged twice a second, how much bandwidth per fill duplex line is occupied by the distributed routing algorith A. 5 bps B. 500 bps C bps D bps 96. A central computer surrounded by one or more satellite computers is called a A. bus network B. star network C. ring network D. all of the above 97. An anticipated result from multi programming operations is: A. better scheduling of work B. the handling of more jobs C. reduced computer idle time D. all of the above 98. FDDI is a A. ring network B. mesh network C. bus based network D. none of the above 99. Modem is used in data transmission. When was it invented and in which country? A. 1950, USA B. 1963, USA

21 C. 1950, Japan D. 1965, Germany 100. Which of the following technique is used for Time-To-Line (TTL)? A. one of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size. B. a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame. C. a technique used in best-effort delivery system to avoid endlessly looping packets. D. all of the above