Data Communication
Question What is multiplexing ? Explain synchronous time division multiplexing technique.
NU Year 2012 2013
Question Illustrate a communication model in simplified form.
NU Year 2008
Question Briefly describe major communication tasks that involved in data communication.
NU Year 2008
Question Distinguish between LAN and WAN.
NU Year 2008
Question What do you mean by network protocol? Compare TCP/IP protocol, suite and OSIreference model
Question Define the terms frequency, spectrum and bandwidth of a signal
NU Year 2008 2014
Question What are major transmission impairments? Explain. Write down about thermal noise.
NU Year 2008
Question Using Shannon's formula, estimate the channel capacity of a voice grade telephone line having S/N ratio of 3018 and bandwidth 3400Hz
NU Year 2008
Question Name the common guided transmission media and give the physical description. Application areas and transmission characteristics of any one of them.
NU Year 2008
Question Write down the advantages of packet switching over circuit switching.
NU Year 2008
Question Distinguish between data gram and virtual circuit with diagram.
NU Year 2008
Question Write short notes on any two of the following:-(i) Microwave transmission.(ii) Time Division switch.(iii) Cellular system.(iv) Amplitude Modulation (AM).
NU Year 2008
Question What are three popular ARQ mechanisms for error control in data communication?
NU Year 2008
Question How does ARQ correct an error?
NU Year 2008
Question How does Go-Bank-N ARQ differ from Selective Repeat ARQ?
NU Year 2008
Question Write down the types of HDLC frames and give a brief description of each.
NU Year 2008
Question Write down about basic characteristics of HDLC protocol. Briefly explain it: frame format.
NU Year 2008
Question With figure explain FDM. Distinguish between Synchronous and Statistical TDM
NU Year 2008
Question Explain CRC technique for error detection
NU Year 2008 2015
Question Describe with diagram the advantages of multistage space division switch with diagram
NU Year 2008
Question Why is FM superior to AM?
NU Year 2008
Question Compare the FM bandwidth with the AM bandwidth
NU Year 2008
Question What are the advantages QAM over ASK and PSK?
NU Year 2008
Question Given a bandwidth of 5000 Hz for an 8-PSK signal. Calculate the band rate.
NU Year 2008
Question what is the fundamental purpose of data communication
Question Describe the simplified Data Communication Model with block diagram
NU Year 2010
Question Define Guided and Unguided Media
NU Year 2010
Question What are the activities of each layer in the OSI layers
NU Year 2010
Question Explain the basic principles of ASK and FSK (Data transition in digital to analog conversation)
NU Year 2010
Question What is constilation diagram? Show the constellation diagram of QPSK
Question What is constellation diagram? Show the constellation diagram of QPSK
NU Year 2010
Question What do you mean by line coding and block coring? Encode the bit stream 10110101 by Manchester and differential Manchester encoding techniques
NU Year 2010
Question What are bit rate and baud rate? A signal is carrying four bits in each signal element ll 1000 signal elements are sent per second, find the bit rate and baud rate.
NU Year 2010
Question What is multiplexing? Exploit how FDM combines multiple signals into one / FDM is an analog multiplexing technique that combines analog signals.
NU Year 2010
Question Discuss synchronous TDM with diagram. Distinguish between Multilevel TDM and Multiple slots TDM.
NU Year 2010
Question With a neat diagram explains the interleaving technique.
NU Year 2010
Question Describe the " Setup Request " phase of a Virtual circuit Network (VCN)
NU Year 2010
Question Construct the Hamming code for the bit sequence 10011101
NU Year 2010
Question Assuming even parity. Find the parity bit for each of the following data units: (i) 1001011 (ii)1110111
NU Year 2010
Question what is a crossbar switch? What is the major limitation ? Explain how a multistage switch overcomes the limitations of the crossbar switch.
NU Year 2010
Question Given a remainder of 111, a data unit of 101 10011 and a divisor of 1001, find whether there is an error or not the data unit
NU Year 2010
Question Explain satellite transmission with VSAT configuration.
NU Year 2010
Question what are the important applications of satellite?
NU Year 2010
Question What is the base of pulse code modulation? Why delta modulation is used?
NU Year 2010
Question Data exchanges over a transmission line can be classified a: full duplex or half duplex. Compare this two way of transmission.
NU Year 2010
Question What is flow control ? Describe the process of stop and wait control with necessary diagram.
NU Year 2010
Question Explain the operation of stop and wait ARQ error control method in case of lost and damaged frames.
NU Year 2010
Question what is a sliding window? What is the purpose of it? A sliding window protocol uses a window of side 15. How many bits are needed to define the sequence number?
NU Year 2010
Question what is ISDN? Discuss different types of channels used in ISDN.
NU Year 2010
Question Define Data Communication. Briefly explain the simplified model of data communication
NU Year 2012 2013 2014
Question What are the differences between half-duplex and full-duplex transmission modes?
NU Year 2012
Question Explain the functions of transport layer and network layer of OSI reference model
NU Year 2012
Question What is the difference between a port address, logical address and a physical address?
NU Year 2012 2014
Question What is transmission impairments? Explain the types of transmission impairments.
NU Year 2012 2015 2014
Question What do you mean by Nyquist bandwidth and Shannon capacity rate?
NU Year 2012
Question What are the bit rate and band rate? A signal ls carrying four bits in each signal element. if 1000 signal elements are sent per second. find the bit rate and band rate.
NU Year 2012
Question sketch the signal waveforms of NRZ-L NRZ-1 and Manchester encoding scheme for 10110011
NU Year 2012
Question What is multiplexing? Explain synchronous time division
NU Year 2012
Question Which of the three multiplexing technique are common for fiber optic link? Explain the reason
NU Year 2012 2013
Question Two channels, one with a bit rate of 150kbs and another with a bit rate of 140kbs are to the multiplexed using pulse stuffing TDM with no synchronous bits. Answer the following question?a. What is the size of a frame in bits?b. What is the frame rate?c. What ls the duration of a frame?d. What is the data rate?
NU Year 2012
Question What is VSAT?Discuss VSAT communication system with configuration?
Question What is VSAT ? Discuss VSAT communication system with configuration?
NU Year 2012
Question Describe ASK FSK and PSK with figure
NU Year 2012
Question Write down the digital signal encoding format
NU Year 2012
Question Explain error detection process
NU Year 2012
Question Describe the model of frame transmission for flow control
NU Year 2012
Question Describe the adoptive routing strategies in the packet switch network
NU Year 2012
Question What are the steps of sliding window flow control ? Describe
NU Year 2012
Question Write short notes (any four):-(a) TCP/IP(b) Channel capacity(c) Wireless transmission(d) CRC(e)Digital switch(f)Packet switching network
NU Year 2012
Question Define standard. State and explain the characteristics of data communication system
NU Year 2011
Question What is protocol? What are the key elements of protocol?
NU Year 2011
Question Describe TCP/IP model
NU Year 2011 2015
Question Briefly discuss about the Nyquist bandwidth and Shanon capacity formula
NU Year 2011
Question Define the terms frequency spectrum and bandwidth of a signal
NU Year 2011
Question What types of impairments are common in data communication.Describe different types of noise
NU Year 2011
Question Using Shannon's formula estimates the channel capacity of a voice grade telephone line-having SN ratio of 30dB and bandwidth 3400hz
NU Year 2011
Question Name the common guided transmission media and give the physical description application areas and transmission characteristics of any one of them
NU Year 2011
Question Depict and describe VSAT communication system and explain it
NU Year 2011 2015
Question Why scrambling technique is used for digital to digital encoding? Depict and describe B8ZS or HDB3
NU Year 2011
Question Distinguish between AM, FM and PM
NU Year 2011 2015
Question Describe CRC technique for error detection
NU Year 2011
Question Describe the procedure of dial up operation using the interface of EIA- 232 interface
NU Year 2011
Question What is packet switching?Mention the advantages of packet switching over circuit switching
NU Year 2011 2013 2015
Question What is multiplexing?Describe synchronous time division multiplexing with figure
NU Year 2011 2014
Question Describe asynchronous transfer mode (ATM) with respect to switching mode, Packet size ATM cells
NU Year 2011
Question State necessity of Frame relay in communication network
NU Year 2011
Question Write short note with necessary diagram (any four) :(a) QPSK(b) HDLC(c) Null model(d) Cellular system(e) Channel capacity
NU Year 2011
Question With diagram explain frequency division multiplexing (FDM)
NU Year 2011
Question Distinguish between synchronous and statistical TDM
NU Year 2011
Question Describe advantages and disadvantages of optical fiber and twisted pair cable in brief
NU Year 2011
Question Describe propagation of light through optical fiber
NU Year 2011
Question Write down the difference between simplex and duplex transmission mode with suitable example
NU Year 2013
Question Make a comparison between TCP/IP and OSI
NU Year 2013
Question Distinguish between connection oriented and connectionless protocols
NU Year 2013
Question Define protocol. List the key elements of protocol
NU Year 2013
Question Name the types of transmission impairments. Briefly explain the different types of noise with examples.
NU Year 2013
Question What does the Nyquist theorem and Shannon capacity formula have to do with communications?
NU Year 2013
Question We have a channel 5KHz bandwidth. If we want to send data at 150 kbps, what is the minimum SNR (dB)?
NU Year 2013
Question Define frequency, spectrum, bandwidth and buad rate with example.
NU Year 2013
Question What is unguided transmission media? What are the drawback of this?
NU Year 2013
Question Briefly explain ASK, FSK, PSK and QAM techniques with the principle advantages and disadvantages.
NU Year 2013 2014
Question Explain the Pulse Code Modulation (PCM) technique and state its limitation.
NU Year 2013 2015 2014
Question What is optical fiber communication? Explain the characteristics of this communication system
NU Year 2013
Question Explain about virtual circuit and datagram approach of pocket switching network with necessary diagram.
NU Year 2013
Question What is router and routing table? Explain the important characteristics of routing function
NU Year 2013 2015
Question Explain about X~25 protocol standard
NU Year 2013
Question Define multiplexing. What are the different types of multiplexing techniques?
NU Year 2013 2014
Question Two channels, one with a bit rate of 150 kbps and another with a bit rate of 140 kbps are to be multiplexed using pulse stuffing TDM with no synchronous bits. Answer the following questions:-(i) What is the size of a frame in bits?(ii) What is the frame rate?
NU Year 2013
Question What is Synchronous Time Division Multiplexing? What are the features of it?
NU Year 2013
Question Compare between the features of FDM and TDM.
NU Year 2013 2015
Question What is switching network? Describe packet switching principles with necessary figure
NU Year 2013
Question Define data communication. Explain the characteristics of data communication system.
NU Year 2015
Question Define analog and digital signal. Briefly explain the different types of noise in data transmission
NU Year 2015
Question What is channel capacity? Briefly describe the Nyquist Bandwidth and Shanon capacity formula
NU Year 2015
Question Given a channel with an intended capacity of 20 Mbps. The bandwidth of the channel is 3Mhz. What signal-to-noise ratio is required in order to achieve this capacity?
NU Year 2015
Question Define data rate and signal rate
NU Year 2015
Question Describe data encoding & modulation techniques with figures
NU Year 2015
Question Distinguish guided and unguided media with examples.
NU Year 2015 2014
Question A channel has a bit rate of 4 Kbps and a propagation delay of 20 m sec For what range of frame size does stop and wait give and efficiency of at least 50 percent ?
NU Year 2015
Question Define multiplexing.Describe Frequency Division Multiplexing (FDM)
NU Year 2015
Question Given the following information, find the minimum bandwidth required for the path :FDM MultiplexingFive devices, each required 4000Hz,200Hz guard band for each device.
NU Year 2015
Question What is IP address? Classify the IP address of class A, B, C and D network.
NU Year 2015
Question Write short notes on the following (any four)(a) Circuit switching(b) Wireless transmission(c) HDLC(d) ARQ(e) ATM network(f) Datagram
NU Year 2015
Question Difference between circuit switching packet switching and ?
NU Year 2014
Question What do you mean by network protocol ? Describe the layers of OSI model
NU Year 2014
Question Define fundamental frequency and channel capacity
NU Year 2014
Question What is relationship between signal's spectrum and its bandwidth?
NU Year 2014
Question For the following digital data sketch the signal waveform using NRZ-L Bipolar .AMI and Manchester encoding scheme for 1011000111001
NU Year 2014
Question With neat diagram explain the interleaving technique
NU Year 2014
Question A multiplexer combine's of 100 Kbps Channel using a time slot of 2 bits. Show the out with four arbitrary inputs :-(i) What is the frame rate?(ii) What is the frame duration?(iii) What is the bit rate?(iv) What is the bit duration?
NU Year 2014
Question Name the advantages of optical fiber over twisted pair and coaxial cable
NU Year 2014
Question How does the propagation differ from line-of sight propagation?
Question How does the sky propagation differ from line-of sight propagation?
NU Year 2014
Question Discuss about wireless transmission waves
NU Year 2014
Question Describe the need for switching and define the switch
Question Describe the need for switching and define a switch
NU Year 2014
Question Compare space division time division switches
NU Year 2014
Question Write short notes (any four) :-(a) Digital switch(b) Cellular communication(c) Stop-and-wait-ARQ;(d) VSAT(e) QPSK(f) X-25 protocols
NU Year 2014
Question Define Data Communication. Briefly explain the simplified model of data communication.
NU Year 2012
Question What are the differences between half-duplex and full-duplex transmission models?
NU Year 2008
Question Explain the functions of transport layer and network layer of OSI reference model.
NU Year 2012
Question What is the difference between a port address, a logical address and a physical address.
NU Year 2012
Question What is transmission impairments? Explain the types of transmission impairments.
NU Year 2012
Question What do you mean by Nyquist bandwidth and Shannon capacity rate?
NU Year 2012
Question What are the bit rate and band rate? A signal os carrying four bits in each signal element. If 1000 signal elements are sent per second, find the bit rate and band rate.
NU Year 2012
Question Sketch the signal waveforms of NRZ-L, NRZ-I and Manchester encoding scheme for 101100111.
NU Year 2012
Question What is multiplexing? Explain synchronous time division multiplexing techniques.
NU Year 2012
Question Which of the three multiplexing techniques are common for fiber optic link? Explain the reason.
NU Year 2012
Question Two channels, one with a bit rate of 150kbs and another with a bit rate of 140kbs are to the multiplexed using pulse stuffing TDM with no synchronous bits. Answer the following questions:- a. What is the size of a frame in bits? b. What is the frame rate? c. What is the duration of a frame? d. What is the data rate?
NU Year 2012
Question What is VSAT? Discuss VSAT communication system with configuration.
NU Year 2012
Question Describe ASK, FSK, and PSK with figure.
NU Year 2012
Question Write down the digital signal encoding format.
NU Year 2012
Question Explain error detection process.
NU Year 2012
Question Describe the model of frame transmission for flow control.
Question Describe the adaptive routing strategies in the packet switch network.
NU Year 2012
Question What are the steps of sliding window flow control? Describe.
NU Year 2012
Question Write short notes:- TCP/IP.
NU Year 2012
Question Write short notes:-Channel capacity.
NU Year 2012
Question Write short notes:- Wireless transmission.
NU Year 2012
Question define that- CRC, Digital switch, Packet Switching Networks.
NU Year 2012
Question Define Standard. State and explain the characteristics of data communication system.
NU Year 2012
Question What is protocol? What are the key elements of protocol?
NU Year 2012
Question Describe TCP/IP model.
NU Year 2012
Question Briefly discuss about the Nyquist bandwidth and Shanon capacity formula.
NU Year 2012
Question Define the terms frequency spectrum and bandwidth of a signal.
NU Year 2012
Question What types of impairments are common in data communication? Describe different types of noise.
NU Year 2012
Question Using Shannon’s formula estimates the channel capacity of a voice grade telephone line having S/N ratio of 30dB and land width 3400Hz.
NU Year 2012
Question Name the common guide transmission media and give the physical description application areas and transmission characteristics of any of them.
NU Year 2012
Question Depict and describe VSAT communication system and explain it.
NU Year 2012
Question Why scrambling techniques is used for digital to digital encoding? Depict and describe B8ZS or HDB3.
NU Year 2012
Question Distinguish between Am, FM and PM.
NU Year 2011
Question Describe the procedure of dial up operation using the interface of EIA-232 interface.
NU Year 2012
Question What is multiplexing? Describe synchronous time division multiplexing with figure.
NU Year 2012
Question What is packet switching? Mention the advantages of packet Switching over circuit switching.
NU Year 2012
Question Describe asynchronous transfer mode (ATM) with respect to switching mode, Packet size, ATM cells.
NU Year 2012
Question State necessity of Frame Relay in communication network.
NU Year 2012
Question Distinguish between synchronous statistical TDM.
NU Year 2012
Question With diagram describe the architecture of a three stage space division switch.
NU Year 2011
Question Describe the advantage and disadvantages of Optical fiber and twisted pair cable in brief.
NU Year 2012
Question Describe propagation of light through optical fiber.
NU Year 2011
Question Write short note with necessary diagram: a. QPSK. b. HDLC. c. Null Modem. d. Cellular system.
NU Year 2011
Question What is the fundamental purpose of Data Communication?
NU Year 2011
Question Describe simplified Data Communication Model with block diagram.
NU Year 2011
Question Define Guided an unguided Media.
NU Year 2010
Question What are the activities of each layer in The OSI Layers.
NU Year 2010
Question Explain the basic principles of ASK and FSK.
NU Year 2010
Question What is constellation diagram? Show the constellation diagram of QPSK.
NU Year 2010
Question What do you mean by line coding and block coding? Encode the bit stream 10110101 byManchester and differential Manchester encoding techniques.
NU Year 2010
Question What are bit rate and baud rate? A signal is carrying four bits in each signal element. If1000 signal elements are sent per second, find the bit rate and baud rate.
NU Year 2010
Question What is multiplexing? Explain how FDM combines multiple signals into one.
Question Discuss synchronous TDM with diagram. Distinguish between multilevel TDM andmultiple slot TDM.
NU Year 2010
Question With a net diagram explain the interleaving technique.
Question Describe the “Setup Request” phase of a Virtual Circuit Network (VCN).
NU Year 2010
Question Construct the Hamming code for the bit sequence 10011101.
NU Year 2010
Question Given a remainder of 111, a data unit of 10110011 and a divisor of 1001, find whetherthere is an error or not in the data unit.
NU Year 2010
Question What is crossbar switch? What is its major limitation? Explain how a multistage switchovercomes the limitations of the crossbar switch.
NU Year 2010
Question Explain satellite transmission with VSAT configuration.
NU Year 2010
Question What are the important applications of satellite?
NU Year 2010
Question What is the base of pulse code modulation? Why delta modulation is used?
NU Year 2010
Question Data exchange over a transmission line can be classified as full duplex and half duplex.Compare this two ways of transmission.
Question What is flow control? Describe the process of stop and wait control with necessarydiagram.
NU Year 2010
Question Explain the operation of stop and wait ARQ error control method in case of lost anddamages frames.
NU Year 2010
Question What is sliding window? What is the purpose of it? A sliding window protocol uses awindow of size 15. How many bits are needed to define the sequence number?
NU Year 2010
Question What is ISDN? Discuss different types of channels used in ISDN.
NU Year 2010
Question Illustrate a communication model in simplified form.
NU Year 2010
Question Briefly describe major communication task that involved in data communication.
NU Year 2010
Question Distinguish between LAN and WAN.
NU Year 2010
Question What do you mean by network protocol? Compare TCP/IP protocol suite and OSIreference model.
NU Year 2008
Question Define the term frequency, spectrum and bandwidth of a signal.
NU Year 2008
Question What are major transmission impairments? Explain. Write down about thermal noise.
NU Year 2008
Question Using Shannon’s formula, estimate the channel capacity of a voice grade telephone linehaving S/N ratio of 30dB and bandwidth 3400Hz.
NU Year 2008
Question Name the common guided transmission media and give the physical description,application areas and transmission characteristics of one of them.
NU Year 2008
Question Write down the advantage of packet switching over a circuit switching.
NU Year 2008
Question Distinguish between datagram and virtual circuit with diagram.
NU Year 2008
Question Write short notes on any two of the following:-a. Microwave transmission.b. Time Division Switch.c. Cellular System.d. Amplitude Modulation (AM)
NU Year 2008
Question What are three popular ARQ mechanisms for error control in data communications?
NU Year 2008
Question How does ARQ correct an error?
NU Year 2008
Question How does Go-Back-N ARQ differ from Selective Repeat ARQ?
NU Year 2008
Question Write down the types of HDLC frames and give a brief description of each.
NU Year 2008
Question Write down about basic characteristics of HDLC protocol. Briefly explain its frameformat.
NU Year 2008
Question With figure explain FDM. Distinguish between Synchronous and Statistical TDM.
NU Year 2008
Question Explain CRC technique for error detection.
NU Year 2008
Question Describe with diagram the advantages and multistage stage division switch withdiagram.
NU Year 2008
Question Why is FM superior to AM?
NU Year 2008
Question Compare the FM bandwidth with the AM bandwidth.
NU Year 2008
Question What are the advantages of QAM over ASK and PSK.
NU Year 2008
Question Given a bandwidth of 5000Hz for an 8-PSK signal. Calculate the band rate and bit rate.
NU Year 2008