MCQs of Data Communication and Networking Q1) Layered tasks involves three layers that are a) b) c) d) Sender Receiver and protocol Sender Receiver and Carrier Sender and Transmission medium Sender Receiver and transmission Medium Q2) OSI stands for __________ open system interconnection b) operating system interface c) optical service implementation d) open service Internet Q3) Which layer is used to link the network support layers and user support layers? a) session layer b) data link layer c) transport layer d) network layer Q4) Which layer is responsible for process to process delivery in a general network model? a) network layer b) transport layer c) session layer d) data link layer Q5) Which address is used to identify a process on a host by the transport layer? a) physical address b) logical address c) port address d) specific address Q6) Which layer provides the services to user? a) application layer b) session layer c) presentation layer d) physical layer Q7) Transmission data rate is decided by ____________ a) network layer b) physical layer c) data link layer d) transport layer Q8) An _______ standard that covers all aspects of network communications is the Open Systems Interconnection model a) ANSI b) EIA c) ISO d) OSI Q9) The OSI model is a _______ layer model for the design of network systems. a) Two b) Five c) Seven d) eight Q10) In the OSI model, headers are added to the data packet at every layer except _______ a) b) c) layer 7 layer 1 a and b d) none of these Q11) In the OSI model, a trailer is added to the data packet at layer _______ a) one b) two c) three d) four Q12) In a peer-to-peer process, layer 4 on machine A communicates with layer _______ on machine B. a) b) c) d) 1 2 3 4 Q13) In _______ process, layer n on the sending machine communicates with layer n on the receiving machine. a) an interface-to-interface b) a peer-to-peer c) a layer-to-layer d) machine-to-machine Q14) The OSI model defines layers 1, 2, and 3 as the _______ layers a) physical support b) network support c) user support d) transport Q15) The OSI model defines layers 5, 6, and 7 as the _______ layers a) physical support b) network support c) user support d) transport Q16) The OSI _______ layer is implemented mainly by software a) application b) session c) presentation d) all of the above Q17) The OSI _______ layer is implemented mainly by hardware a) application b) session c) presentation d) physical Q18) As the data packet moves from the _______ layer down to the _______ layer, headers and a trailer are added a)application; physical b) physical; application c) network; application d) data link; application Q19) At the _______ layer, the data unit is transformed into the corresponding electromagnetic signal. a) application b) data link c) session d) physical Q20) The _______ is defined by the physical layer. a) logical address b) session dialog c) data rate d) encryption method Q21) The _______ layer defines the transmission medium a) application b) session c) presentation d) physical Q22) The _______ layer defines the type of encoding to be used a) application b) transport c) data link d) physical Q23) The_________ layer lies between the session layer and the application layer. a. network layer b. transport layer c. data link layer d. presentation layer Q24) Decryption and encryption are the features of a. transport layer b. presentation layer c. session layer d. physical layer 25) Subnet usually comprises a. layer 1 and 2 b. layer 1 through 3 c. all layers d. none of the above Q26) The layer is responsible for process delivery a. network layer b. transport layer c. session layer d. data link layer Q27) The_________ layer uses data compression yo reduce the number of bits to be transmitted. a. presentation b. network c. data link d. application Q28) The data link layer takes the packets from _________ and sends them into frames for transmission. a) application layer b) physical layer c) network layer d)all of the above Q29) Datalink is not able to perform a) channel coding b) flow control c) error control d) framing Q30) The data link layer divide the stream of bits received from the network layer into data units is known as a)frame b)segment c)datagrams d)message Q31) data link protocol known as?? a) HDLC b) point to point protocol c) ethernet d) all of the mentioned Q32) The layer lies above the physical layer is a)data b)data link c)network layer d)transport layer Q33) In a real-life network, data link protocols are used as a)in any direction b)in one direction c)in two direction d)in any direction Q34) Which Layer do Error control to compensate for the imperfections of the physical layer? a)Physical Layer b)data link c)network layer d)transport layer Q34) Flow control to keep a fast sender from swamping a slow receiver is a feature of? a)Physical Layer b)data link c)network layer d)transport layer Q35) Each layer of the OSI model receives services or data from a ___ layer. a)Below Layer b) Above Layer c) From both side d) A and C Q36) In the OSI model, each layer gives services or data to the __ layer. a) Below Layer b) Above Layer c) From both side d) A and C Q37) A layer of the OSI model on one system communicates with the ___ layer of its peer system. a) Below Layer b) Above Layer c) Same Layer d) None of these Q38) In an OSI model, the lowest layer is the ___ layer. . a)Application Layer b) Physical Layer c) Presentation Layer d)Data Link Layer Q39) In the OSI model, which is the highest layer? A) Application Layer B) Physical Layer C) Presentation Layer D) Network Layer Q40) In the OSI model, the bottom 3 layers assist in ___. A) converting data B) transporting data C) Comprising Data D) Encrypting Data Q41) What are the advantages of 7 layers of OSI model? A) Troubleshooting the network is easy. B) Developing new functions or services for a particular layer is easy. C) Developing hardware devices targetting certain layers is easy because the services to be offered are fixed. D) All the above Q42) A set of standards that define how to communicate with each layer of the OSI model are ___. A) functions B) protocols C) data formats D) All the above. Q43) The transmission media like ___ are part of the Physical layer of OSI model. A) Copper cables B) OFC - Optical Fiber Cables C) RF - Radio Frequency waves including Microwaves D) All the above Q44) An ethernet cable is part of __ layer in the OSI model. A) Physical layer B) Data Link Layer C) Network Layer D) Transport Layer Q45) Which is the layer of the OSI reference model that employs Error Detection? A) Physical Layer B) Data Link Layer C) Network Layer D) Session Layer Q46) Which is the layer that converts Packets to Frames and Frames to Packets in the OSI model? A) Physical Layer B) Data Link Layer C) Network Layer D) Transport Layer Q47) Which is the layer that converts Raw Bits to Frames and Frames to Raw Bits in the OSI model? A) Physical Layer B) Data Link Layer C) Network Layer D) Transport Layer Q48) to provide reliable process-to-process message delivery and error recovery is responsibility of a) Physical Layer b) Data Link Layer c) Network Layer d) Transport Layer Q49) to establish manage and terminate session is feature of a) Transport Layer b) Session Layer c) Presentation Layer d) Application Layer Q50) The _____ layer is responsible for dialog control and synchronization. a) Network Layer b) Transport Layer c) Session Layer d) Presentation Layer 1.Before data can be transmitted, they must be transformed to……... a. periodic signals b. electromagnetic signals c. aperiodic signals d. low-frequency sine waves 2. in a frequency-domain plot, the horizontal axis measures the……. a. peak amplitude b. frequency c. phase d. slope 3.what is the bandwidth of a signal that ranges from 1MHz to 4MHz? a.4 MHz b. 1KHz b.3MHz d. None of the above 4.As frequency increases, the period ……… a. increase b. decreases c. remains the same d. doubles 5. A sine wave is …………… a. b. c. d. periodic and continuous aperiodic and continuous periodic and discreate aperiodic and discreate 6.if the maximum amplitude of a sine wave is 2V, the maximum amplitude is …………….V a. 2 b.1 c. -2 d. 0 7. ---------- is a type of transmission impairment in which the signal loss strength due to the resistance of the transmission medium. a. Attenuation b. Distortion c. Noise d. Decibel 8. -------------is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. a. Attenuation b. Distortion c. Noise d. Decibel 9. Data can be------------a. analog b. Digital c.(a) or (b) d. none of the above 10. ---------data are continuous and take continuous values. a. analog b. Digital c.(a) or (b) d. none of the above 11. -------------signals can have an infinite number of values in a range. a. analog b. Digital c.(a) or (b) d. none of the above 12.frequency and period are ------- a. inverse of each other b. proportional to each other c. the same d. none of the above 13.---------------is the rate of change with respect to time. a. Amplitude b. Time c. frequency d. voltage 14. A--------------sine wave is not useful in data communication; we need to send a ---------signal. a. composite; single-frequency b. single-frequency; composite c. single-frequency; double- frequency d. none of the above 15. The------of a composite signal is the difference between the highest and the lowest frequencies in that signal. a. frequency b. period c. bandwidth d. amplitude 16. A(n) ----------------signal is a composite analog signal with an infinite bandwidth. a. analog b. Digital c.(a) or (b) d. none of the above 17. baseband transmission of a digital signal is possible only if we have a -------channel. a. low-pass b. bandpass c. low rate d. high rate 18. if the available channel is a -----------channel, we cannot send a digital signal directly to the channel. a. low-pass b. bandpass c. low rate d. high rate 19. ------------- is a type of transmission impairment in which the signal loss strength due to the different propagation speeds of each frequency that makes up the signal. a. Attenuation b. Distortion c. Noise d. Decibel 20. In a time-domain plot, the horizontal axis is a measure of-------------a. signal amplitude b. frequency c. phase d. time 21. to deliver a message to the correct application program running on a host , the -------address must be consulted. a. port b. IP c. physical d. none of the above 22. IPV6 has -----bit addresses. a.32 b.64 c.128 d. variable 23.------------------provides full transport layer services to application. a. TCP b. UDP c. ARP D. none of the above 24. The -----address, also known as the link address, is the address of a node as defined by its LAN or WAN a. port b. Logical c. physical d. none of above 25. Ethernet uses a ----------physical address that is important on the network interface card(NIC) a. 32-bit b. 64-bit c.6-byte d. 8-byte 26. TCP/IP is a ---------------hierarchical protocol suite developed -----the OSI model. a. seven-layer; before b. five-layer; before c. six-layer; before d. five-layer; after 27. the TCP/IP -----------layer is equivalent to the combined session, presentation, and application layers of the OSI model. a. Application b. Network c. Data link d. physical 28. the internet model consist of -------layers a. b. c. d. Three Five Seven Eight 29. The ---------address identifies a process on a host. a. b. c. d. Physical IP Port Specific 30. A port address in TCP/IP is -----bits long a. 32 b. 48 c. 16 d. none of the above 31. The internetworking Protocol (IP) is a --------------protocol. a. reliable b. connection-oriented c. both a and b d. none of the above 32.The ------------layer changes bits into electromagnetic signals. a. physical b. data link c. transport d. none of the above 33. -------has units of bits /second. a. throughput b. propagation speed c. propagation time 34. the wavelength of a signal depends on the -----------a. frequencies of the signal b. medium c. phase of the signal d. (A) and (b) 36. Which is similar to postal system where every message contains the complete destination address and is mapped through the system, free of all the others a. Connection-oriented services b. Connectionless services c. Both a & b d. None of these The various types of services provided by the interface to the layers above them are listed as follows a. Connection-oriented services b. Connectionless services c. Both a & b d. None of these 39. When a propagation speed is multiplied by propagation time, we get the --------a. throughput b. wavelength of signal c. distortion d. distance a signal or bit has traveled 40. Frequency of failure and network recovery time after a failure are measures of the _______of a network. a. Performance b. Security c. Reliability d. Feasibility 41. Which agency developed standards for physical connection interfaces and electronic signaling specifications? a. ISO b. ITU-T c. ANSI d. EIA 42. The _______ is the physical path over which a message travels. a. Protocol b. Signal c. Medium d. All the above 43. A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________. a. P2 equals P1 b. P2 is zero c. P2 is much larger than P1 d. P2 is much smaller than P1 44. The _________ product defines the number of bits that can fill the link. a. delay-amplitude b. frequency-amplitude c. bandwidth-period d. bandwidth-delay 45.Before data can be transmitted, they must be transformed to ________. A) periodic signals B) electromagnetic signals C) aperiodic signals D) low-frequency sine waves 46. For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate. a. noiseless b. noisy c. low-pass d. bandpass 47. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz? a. 1 KHz b. 3 MHz c. 4 MHz d. none of the above 48. ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. a. Noise b. Distortion c. Attenuation d. Decibel 49. The black and white Tv is an example of----------------a. non periodic composite signal b. periodic composite signal c. periodic composite signal d. non periodic composite signal 50. Increase the level of a signal reduce the------a. reliability of the signal b. efficiency of the signal c speed of system 51. If the signal does not change at all, its frequency is a. zero b. maximum c. infinite d. high 52. we send a voice signal from microphone to a recorder, the transmission is a. baseband transmission b. broad band transmission c. authenticated d. broadcast 53. The unit that is used to express the state of the signal is a. Kilogram b. Second c. Decibel d. Hertz 54. Bit rate measure in---a. Bit per hertz b. Bit per second c. Nano second d. Pixel per second 55. Conversion of the digital to analog signal is a. Modulation b. Demodulation c. Encapsulation d. Bypass 56. A sine wave is defined by a. amplitude b. frequency c. phase d. All of the above 57. The completion of one full pattern in signal is known as a. period b. cycle c. frame d. segment 58. Bit rate is the number of bits sent in a. 1 sec b. 2sec c. 10 sec d. 100 sec