Data Communication Questions and Answers updated daily – Computer Knowledge



158 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 can greatly reduce TCP/IP configuration problems?



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Correct Ans:DHCP Server
Explanation:


2. A noiseless 3 KHz Channel transmits bits with binary level signals. What is the maximum data rate?



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Correct Ans:6 Kbps
Explanation:


3. What part of 192.168.10.51 is the Network ID, assuming a default subnet mask?



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Correct Ans:192.168.10
Explanation:


4. ICMP (Internet Control Message Protocol) is



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Correct Ans:a protocol that handles error and control messages
Explanation:


5. 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?



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Correct Ans:UDP
Explanation:


6. When you ping the loopback address, a packet is sent where?



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Correct Ans:Down through the layers of the IP architecture and then up the layers again
Explanation:


7. Satellite-Switched Time-Division Multiple Access (SS/TDMA) is



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Correct Ans:a form of TDMA in which circuit switching is used to dynamically change the channel assignments
Explanation:


8. Avalanche photodiode receivers can detect hits of transmitted data by receiving



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Correct Ans:200 photons
Explanation:


9. Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing plant in the suburbs. To enable everyone to share data and resources between the two LANs, what type of device(s) are needed to connect them? Choose the most correct answer.



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Correct Ans:Router
Explanation:


10. The Internet Control Message Protocol (ICMP)



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Correct Ans:All of the above
Explanation:


11. You have a class A network address 10.0.0.0 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. Which subnet mask should you assign?



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Correct Ans:255.254.0.0
Explanation:


12. The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to



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Correct Ans:0.009
Explanation:


13. Which agency developed standards for physical connection interfaces and electronic signaling specifications?



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Correct Ans:EIA
Explanation:


14. Which organization has authority over interstate and international commerce in the communications field?



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Correct Ans:FCC
Explanation:


15. One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field?



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Correct Ans:It can be used to prevent packet looping
Explanation:
Time to Live can be thought as an upper bound on the time that an IP datagram can exist in the network. The purpose of the TTL field is to avoid a situation in which an undeliverable datagram keeps circulating.


16. Consider different activities related to email.
m1:Send an email from a mail client to mail server
m2:Download an email from mailbox server to a mail client
m3:Checking email in a web browser

Which is the applicable level protocol user in each activity?



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Correct Ans:m1:SMTP, m2:POP, m3:HTTP
Explanation:
Simple Mail Transfer Protocol (SMTP) is typically used by user clients for sending mails. Post Office Protocol (POP) is used by clients for receiving mails. Checking mails in web browser is a simple HTTP process.


17. A layer-4 firewall ( a device that can look at all protocol headers up to the transport layer) CANNOT



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Correct Ans:block HTTP traffic during 9:00PM and 5:00AM
Explanation:


18. In the IPv4 addressing format, the number of networks allowed under Class C addresses is



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Correct Ans:2^21
Explanation:
In class C, 8 bits are reserved for Host Id and 24 bits are reserved for Network Id. Out of these 24 Network Id bits, the leading 3 bits are fixed as 110. So remaining 21 bits can be used for different networks


19. Which of the following transport layer protocol is used to support electronic mail?



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Correct Ans:SMTP
Explanation:


20. The protocol data unit(PDU) for the application layer in the Internet stack is



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Correct Ans:Message
Explanation:



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