A. the number of bit errors per twenty four hours of continuous operation on an asynchronous line
B. The probability that one or more errors will be undetected when an error detection scheme is used
C. the probability that one or more errors will be detected when an error detection mechanism is used
D. signal to noise ratio divided by the ratio of energy per bit to noise per hertz
2. which of the following summation operations is performed on the bits to check an error-detecting code?
3..The research and development department at your office has been experimenting with different technologies to help improve the performance of the network. One group has been examining the use of a broadband network versus a based band network. Select the correct statement about broadband and baseband.
A. Broadband networks carry several channels on a single cable, whereas in a baseband network several cables carry one channel
B. Baseband networks carry a single channel on a single cable, whereas broadband networks carry several channels on a single cable
C. Baseband refers to local area networks, and broadband refers to wide area networks.
D. Baseband operates at a standard bit rate, whereas broadband may operate at different rates as needed
E. Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions
4. An error-detecting code inserted as a field in a block of data to be transmitted is known as
5. The cheapest modems can transmit
6. 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 which permits digital to analog conversion at the start of a long distance transmission?
7. What is the usual number of bits transmitted simultaneously in parallel data transmission used by microcomputers?
8. The receive equalizer reduces delay distortions using a
9. 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 topologies.
10. 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 traffic?
11. Sending a file from your personal computer's primary memory or disk to another computer is called
12. What is the name of the software package that allows people to send electronic mail along a network of computers and workstations?
A. Memory resident package
B. Project management package
C. Data communication package
D. Electronic mail package
13. The communication mode that supports two-way traffic but only one direction at a time is
14. HMP (Host Monitoring Protocol) is:
A. a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
B. a TCP/IP high level protocol for transferring files from one machine to another.
C. a protocol used to monitor computers
D. a protocol that handles error and control messages
15. Which of the following is a voiceband channel?
16. 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?
17. Data are sent over pin _____ of the EIA-232 interface.
18. To connect a computer with a device in the same room, you might be likely to use
19. Demodulation is a process of
A. converting analog to digital signals
B. converting digital to analog signals
C. multiplexing various signals into one high speed line signals
D. performing data description.
20. Internet-like networks between a company and its business partners. Select the best fit for answer:
A. Bandwidth alternatives
C. Inter organizational networks
21. An example of an analog communication method is
C. voice grade telephone line
22. 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?
23. 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
24. Transmission of computerised data from one location to another is called
25. Compared to analog signals, digital signals
A. allow faster transmission
26. FDDI is a
ANS : A
27. An anticipated result from multiprogramming operations is:
A. reduced computer idle time
B. the handling of more jobs
C. better scheduling of work
28. A central computer surrounded by one or more satellite computers is called a
29. 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 algorithm?
30. HOSTS file entries are limited to how many characters?
31. Demodulation is the process of
A. converting digital signals to analog signals
B. converting analog signals to digital signals
C. combining many low speed channels into one high speed channel
D. dividing the high-speed signals into frequency bands
32. Which of the following statement is incorrect?
A. The Addresses Resolution Protocol, ARP, allows a host to find the physical address of a target host on the same physical network, given only the target IP address.
B. The sender's IP - to- physical address binding is included in every ARP broadcast; receivers update the IP-to-Physical address binding information in their cache before processing an ARP packet.
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.
33. You are working with a network that has the network ID 192.168.10.0. What subnet should you use that supports up to 25 hosts and a maximum number of subnets?
34. Which of the following best illustrates the default subnet mask for a class A,B, and C Network?
A. 0.0.0.0, 0.0.0.1, 0.0.1.1
B. 255.255.255.0, 255.255.0.0, 255.0.0.0
C. 255.0.0.0, 255.255.0.0, 255.255.255.0
D. 255.255.0.0, 255.255.255.0, 255.255.255.255
35. Modulation is the process of
A. converting analog signals to digital signals
B. converting digital signals to analog signals
C. Multiplexing various signals into high speed line signals
D. performing data encryption.
36. Devices interconnected by the LAN should include
A. Computers and terminals
B. mass storage device, printers and plotters
37. What are the data transmission channels available for carrying data from one location to another?
38. On a class B network, how many hosts are available at each site with a subnet mask of 248?
39. Which of the following technique is used for encapsulation?
A. a technique used in best-effort delivery systems to avoid endlessly looping packets.
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. 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
40. You are working with three networks that have the network IDs 192.168.5.0, 192.168.6.0, and 192.168.7.0. What subnet mask can you use to combine these addresses into one?
41. With an IP address set starting with 150, you currently have six offices that you are treating as subnets. Plans are in place to open 10 more offices before the end of the year. What subnet mask should you use to satisfy the needed number of subnets and maximize the number of hosts available at each site?
42. A machine that connects to two or more electronic mail systems and transfers mail messages among them is known as
43. IF digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is
44. Error detection at a data link level is achieved by
B. cyclic redundancy codes
45. When the computer provides the manager with a multiple choice of possible answers, the prompting technique is
46. Which network topology is considered passive?
47. If a firm wanted to transmit data from 1,000 punched cards to a remote computer, they would use a(n)
B. data collection terminal
C. batch processing terminal
48. Which address is the loopback address?
49. Error rate is
A. 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.
C. 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.
D. the ratio of the number of data units in error to the total number of data units
50. 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 answer:
B. Virtual Private Network
C. Network operating system
ANS KEY
1.B
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2.C
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3.B
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4.A
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5.A
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6.B
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7.A
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8.A
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9.D
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10.D
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11.A
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12.C
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13.C
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14.C
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15.A
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16.D
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17.A
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18.A
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19.A
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20.D
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21.D
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22.A
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23.D
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24.C
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25.C
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26.A
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27.D
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28.C
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29.D
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30.B
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31.B
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32.D
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33.B
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34.C
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35.B
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36.D
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37.D
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38.D
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39.B
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40.A
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41.D
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42.B
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43.B
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44.B
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45.D
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46.E
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47.C
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48.C
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49.D
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50.B
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