Data Communication Questions and Answers updated daily – Computer Knowledge



251 Data Communication Questions and answers section with explanation for various online exam preparation, various interviews, Computer Knowledge Data Communication online test. Data Communication Questions with detailed description, explanation will help you to master the topic.

Data Communication Questions

1. What is the main purpose of a data link content monitor?



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Correct Ans:to detect problems in protocols
Explanation:


2. Phase shift keying (psk) method is used to modulate digital signals at 9600 bps using 16 levels. Find the line signaling speed (i.e., modulation rate)



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Correct Ans:2400 bands
Explanation:


3. Which of the following program is used to copy files to or from another UNIX timesharing system over a single link?



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Correct Ans:UUCP
Explanation:


4. What is the maximum number of entries in the HOSTS file?



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Correct Ans:Unlimited
Explanation:


5. In cyclic redundancy checking what is the CRC?



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Correct Ans:the remainder
Explanation:


6. When you connect to an online information service, you are asked to provide some kind of identification such as your name, an account number and a password. What is the name given to this brief dialogue between you and the information system?



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Correct Ans:Log-on procedure
Explanation:


7. You have purchased a MAU (Multistation Access Unit) from your computer supplier and now must decide what type of network card you should install in the workstations. Which of the following would be the most appropriate?



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Correct Ans:Token-Ring
Explanation:


8. Which of the following digits are known as the sub-address digits (for use by the user) of the Network User Address (NUA)



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Correct Ans:13-14
Explanation:


9. A 6-MHz channel is used by a digital signaling system utilizing 4-level signals. What is the maximum possible transmission rate?



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Correct Ans:12 Mbaud/sec
Explanation:


10. You are working with a network that is 172.16.0.0 and would like to support 600 hosts per subnet. What subnet mask should you use?



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Correct Ans:255.255.252.0
Explanation:


11. A group of 2^m - 1 routers are interconnected in a centralized binary tree, with router at each tree node. Router I communicate with router J by sending a message to the root of the tree. The root then sends the message back down to J. Then find the mean router-router path length.



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Correct Ans:2 (m - 2)
Explanation:


12. You are working with a network that has the network ID 10.9.0.0 and contains 73 networks. In the next year, you will be adding an additional 27 branch offices to your company. For simplified management, you want to keep the most possible hosts per subnet. Which subnet mask should you management, you want to keep the most possible hosts per subnet. Which subnet mask should you use?



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Correct Ans:255.254.0.0
Explanation:


13. Many large organizations with their offices in different countries of the world connect their computers through telecommunication satellites and telephone lines. Such a communication network is called



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Correct Ans:WAN
Explanation:


14. Which of the following allows a simple email service and is responsible for moving messages from one mail server to another?



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Correct Ans:SMTP
Explanation:


15. The CCITT Recommendation X.25 specifies three layers of communications:



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Correct Ans:physical datalink and network
Explanation:


16. A T-switch is used to



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Correct Ans:rearrange the connections between computing equipment
Explanation:


17. The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide?



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Correct Ans:A physical address that is assigned by the manufacturer
Explanation:


18. What OSI layer handles logical address to logical name resolution?



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Correct Ans:Transport layer
Explanation:


19. A 4 KHz noise less channel with one sample every 125 per sec is used to transmit digital signals. If Delta modulation is selected, then how many bits per second are actually sent?



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Correct Ans:8 kbps
Explanation:


20. If the ASCII character H is sent and the character I is received, what type of error is this?



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Correct Ans:single-bit
Explanation:





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