Unit-5: Network Communication and Protocols  (40 MCQs)

11th Class Computer Science MCQs Preparation 

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as
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1. In which communication mode data can be sent and received in both directions but not simultaneously?




... Answer is B. Half duplex mode
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2. Which of the following network devices connects a network to another that uses a different protocol?




... Answer is B. Gateway
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3. Which of the following networks provides remote access to individuals and offices to their organization




... Answer is D. VAN
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4. In which topology a hub (switch) is used?




... Answer is A. Star topology
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5.  Which topology is most expensive to implement?




... Answer is D. Mesh topology
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6. Which layer of the OSI Model decides which physical pathway the data should take to reach the destination?




... Answer is B. Network layer
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7. Which network layer performs security, name recognition, logging, and similar functions. :




... Answer is D. Session Layer
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8. Which of these cables transmit data using light waves?




... Answer is C. Fiber optic cable
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9. Which of these transmissions uses a star/stop bit?




... Answer is A. Asynchronous
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10. Which bits are used at the start of a class B IP?




... Answer is B. 10`
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11. Computer networks allow users to share.




... Answer is D. All
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12. The set of rules to exchange data in a communication network is called.




... Answer is A. Protocol
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13. All the following are the elements of the data communication system EXCEPT.




... Answer is D. Voltage
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14.  A telephone conversation is an example of




... Answer is A. Full-duplex
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15. Television broadcast is an example of




... Answer is C. Simplex
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16.. In which type of data transmission data is transmitted block by block?




... Answer is B. Synchronous
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17. Which of the following is an example of unguided media :




... Answer is C. satellite
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18. Which type of transmission media uses light waves for transmitting information?




... Answer is B. Fiber optic cable
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19. Many networks include a central computer called.




... Answer is A. Server
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20. A lab with twenty computers and a laser printer is an example of ____________ area network




... Answer is C. Local
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21. The physical layout of connected devices in a network is called.




... Answer is A. Topology
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22. Which topology requires a central device such as a switch?




... Answer is A. Star
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23. Which of the following topologies is expensive and difficult to install




... Answer is C. Mesh
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24. What  The entire network goes down in which topology if the backbone cable fails?




... Answer is A. Bus
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25.  How many layers does the OSI model consist of?




... Answer is A. 3
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26. Which layer is responsible for establishing, maintaining, and terminating user connection?




... Answer is D. Session
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27. The topmost layer of the OSI is called ______________. :




... Answer is A. Application
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28. The bottom layer of the OSI model is




... Answer is B. Physical
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29. Which of the following is the most important layer concerned with transmitting a stream of bits over the physical cables or wires




... Answer is B. Physical
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30. The layer that defines the formats the data uses as it is transmitted on the communication line is called ______________.




... Answer is B. Presentation layer
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31. The layer that provides services that directly support user applications is ______________.




... Answer is A. Application layer
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32. In the OSI model, encryption and decryption are functions of which layer?




... Answer is B. Presentation
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33. OSI stands for




... Answer is A. Open system interconnection
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34. Which network is made of a set of switches connected by a physical link?




... Answer is B. Circuit switched
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35.  An IP address is composed of




... Answer is C. 32 bits
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36. The four numbers in an IP address are called____________.




... Answer is A. Octet
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37. Which class IP addresses were designed for large networks? :




... Answer is A. A
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38. The default mask for class A is




... Answer is A. 255.0.0.0
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39. The default mask for class B is




... Answer is D. 255.255.0.0
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40. The default mask for class C is




... Answer is C. 255.255.255.0
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