Data Communication
Details
Download pdf| Question | What is multiplexing ? Explain synchronous time division multiplexing technique. | ||
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| NU Year | 2012 2013 | ||
| Question | Illustrate a communication model in simplified form. | ||
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| NU Year | 2008 | ||
| Question | Briefly describe major communication tasks that involved in data communication. | ||
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| NU Year | 2008 | ||
| Question | Distinguish between LAN and WAN. | ||
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| NU Year | 2008 | ||
| Question | What do you mean by network protocol? Compare TCP/IP protocol, suite and OSIreference model | ||
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| Question | Define the terms frequency, spectrum and bandwidth of a signal | ||
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| NU Year | 2008 2014 | ||
| Question | What are major transmission impairments? Explain. Write down about thermal noise. | ||
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| 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 | ||
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| 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. | ||
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| NU Year | 2008 | ||
| Question | Write down the advantages of packet switching over circuit switching. | ||
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| NU Year | 2008 | ||
| Question | Distinguish between data gram and virtual circuit with diagram. | ||
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| 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). | ||
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| NU Year | 2008 | ||
| Question | What are three popular ARQ mechanisms for error control in data communication? | ||
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| NU Year | 2008 | ||
| Question | How does ARQ correct an error? | ||
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| NU Year | 2008 | ||
| Question | How does Go-Bank-N ARQ differ from Selective Repeat ARQ? | ||
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| NU Year | 2008 | ||
| Question | Write down the types of HDLC frames and give a brief description of each. | ||
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| NU Year | 2008 | ||
| Question | Write down about basic characteristics of HDLC protocol. Briefly explain it: frame format. | ||
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| NU Year | 2008 | ||
| Question | With figure explain FDM. Distinguish between Synchronous and Statistical TDM | ||
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| NU Year | 2008 | ||
| Question | Explain CRC technique for error detection | ||
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| NU Year | 2008 2015 | ||
| Question | Describe with diagram the advantages of multistage space division switch with diagram | ||
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| NU Year | 2008 | ||
| Question | Why is FM superior to AM? | ||
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| NU Year | 2008 | ||
| Question | Compare the FM bandwidth with the AM bandwidth | ||
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| NU Year | 2008 | ||
| Question | What are the advantages QAM over ASK and PSK? | ||
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| NU Year | 2008 | ||
| Question | Given a bandwidth of 5000 Hz for an 8-PSK signal. Calculate the band rate. | ||
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| NU Year | 2008 | ||
| Question | what is the fundamental purpose of data communication | ||
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| Question | Describe the simplified Data Communication Model with block diagram | ||
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| NU Year | 2010 | ||
| Question | Define Guided and Unguided Media | ||
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| NU Year | 2010 | ||
| Question | What are the activities of each layer in the OSI layers | ||
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| NU Year | 2010 | ||
| Question | Explain the basic principles of ASK and FSK (Data transition in digital to analog conversation) | ||
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| NU Year | 2010 | ||
| Question | What is constilation diagram? Show the constellation diagram of QPSK | ||
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| Question | What is constellation diagram? Show the constellation diagram of QPSK | ||
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| NU Year | 2010 | ||
32 What do you mean by line coding and block coring? Encode the bit stream 10110101 by Manchester an
| Question | What do you mean by line coding and block coring? Encode the bit stream 10110101 by Manchester and differential Manchester encoding techniques | ||
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| NU Year | 2010 | ||
33 What are bit rate and baud rate? A signal is carrying four bits in each signal element ll 1000 si
| 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. | ||
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| NU Year | 2010 | ||
34 What is multiplexing? Exploit how FDM combines multiple signals into one / FDM is an analog multi
| Question | What is multiplexing? Exploit how FDM combines multiple signals into one / FDM is an analog multiplexing technique that combines analog signals. | ||
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| NU Year | 2010 | ||
| Question | Discuss synchronous TDM with diagram. Distinguish between Multilevel TDM and Multiple slots TDM. | ||
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| NU Year | 2010 | ||
| Question | With a neat diagram explains the interleaving technique. | ||
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| NU Year | 2010 | ||
| Question | Describe the " Setup Request " phase of a Virtual circuit Network (VCN) | ||
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| NU Year | 2010 | ||
| Question | Construct the Hamming code for the bit sequence 10011101 | ||
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| NU Year | 2010 | ||
39 Assuming even parity. Find the parity bit for each of the following data units: (i) 1001011 (ii)1
| Question | Assuming even parity. Find the parity bit for each of the following data units: (i) 1001011 (ii)1110111 | ||
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| NU Year | 2010 | ||
40 what is a crossbar switch? What is the major limitation ? Explain how a multistage switch overcom
| Question | what is a crossbar switch? What is the major limitation ? Explain how a multistage switch overcomes the limitations of the crossbar switch. | ||
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| NU Year | 2010 | ||
41 Given a remainder of 111, a data unit of 101 10011 and a divisor of 1001, find whether there is a
| 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 | ||
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| NU Year | 2010 | ||
| Question | Explain satellite transmission with VSAT configuration. | ||
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| NU Year | 2010 | ||
| Question | what are the important applications of satellite? | ||
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| NU Year | 2010 | ||
| Question | What is the base of pulse code modulation? Why delta modulation is used? | ||
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| 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. | ||
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| NU Year | 2010 | ||
| Question | What is flow control ? Describe the process of stop and wait control with necessary diagram. | ||
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| NU Year | 2010 | ||
47 Explain the operation of stop and wait ARQ error control method in case of lost and damaged frame
| Question | Explain the operation of stop and wait ARQ error control method in case of lost and damaged frames. | ||
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| NU Year | 2010 | ||
48 what is a sliding window? What is the purpose of it? A sliding window protocol uses a window of s
| 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? | ||
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| NU Year | 2010 | ||
| Question | what is ISDN? Discuss different types of channels used in ISDN. | ||
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| NU Year | 2010 | ||
| Question | Define Data Communication. Briefly explain the simplified model of data communication | ||
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| NU Year | 2012 2013 2014 | ||
| Question | What are the differences between half-duplex and full-duplex transmission modes? | ||
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| NU Year | 2012 | ||
| Question | Explain the functions of transport layer and network layer of OSI reference model | ||
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| NU Year | 2012 | ||
| Question | What is the difference between a port address, logical address and a physical address? | ||
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| NU Year | 2012 2014 | ||
| Question | What is transmission impairments? Explain the types of transmission impairments. | ||
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| NU Year | 2012 2015 2014 | ||
| Question | What do you mean by Nyquist bandwidth and Shannon capacity rate? | ||
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| NU Year | 2012 | ||
56 What are the bit rate and band rate? A signal ls carrying four bits in each signal element. if 10
| 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. | ||
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| NU Year | 2012 | ||
| Question | sketch the signal waveforms of NRZ-L NRZ-1 and Manchester encoding scheme for 10110011 | ||
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| NU Year | 2012 | ||
| Question | What is multiplexing? Explain synchronous time division | ||
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| NU Year | 2012 | ||
| Question | Which of the three multiplexing technique are common for fiber optic link? Explain the reason | ||
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| NU Year | 2012 2013 | ||
60 Two channels, one with a bit rate of 150kbs and another with a bit rate of 140kbs are to the mult
| 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? | ||
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| NU Year | 2012 | ||
| Question | What is VSAT?Discuss VSAT communication system with configuration? | ||
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| Question | What is VSAT ? Discuss VSAT communication system with configuration? | ||
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| NU Year | 2012 | ||
| Question | Describe ASK FSK and PSK with figure | ||
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| NU Year | 2012 | ||
| Question | Write down the digital signal encoding format | ||
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| NU Year | 2012 | ||
| Question | Explain error detection process | ||
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| NU Year | 2012 | ||
| Question | Describe the model of frame transmission for flow control | ||
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| NU Year | 2012 | ||
| Question | Describe the adoptive routing strategies in the packet switch network | ||
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| NU Year | 2012 | ||
| Question | What are the steps of sliding window flow control ? Describe | ||
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| 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 | ||
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| NU Year | 2012 | ||
| Question | Define standard. State and explain the characteristics of data communication system | ||
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| NU Year | 2011 | ||
| Question | What is protocol? What are the key elements of protocol? | ||
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| NU Year | 2011 | ||
| Question | Describe TCP/IP model | ||
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| NU Year | 2011 2015 | ||
| Question | Briefly discuss about the Nyquist bandwidth and Shanon capacity formula | ||
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| NU Year | 2011 | ||
| Question | Define the terms frequency spectrum and bandwidth of a signal | ||
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| NU Year | 2011 | ||
| Question | What types of impairments are common in data communication.Describe different types of noise | ||
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| 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 | ||
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| 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 | ||
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| NU Year | 2011 | ||
| Question | Depict and describe VSAT communication system and explain it | ||
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| NU Year | 2011 2015 | ||
79 Why scrambling technique is used for digital to digital encoding? Depict and describe B8ZS or HDB
| Question | Why scrambling technique is used for digital to digital encoding? Depict and describe B8ZS or HDB3 | ||
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| NU Year | 2011 | ||
| Question | Distinguish between AM, FM and PM | ||
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| NU Year | 2011 2015 | ||
| Question | Describe CRC technique for error detection | ||
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| NU Year | 2011 | ||
| Question | Describe the procedure of dial up operation using the interface of EIA- 232 interface | ||
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| NU Year | 2011 | ||
| Question | What is packet switching?Mention the advantages of packet switching over circuit switching | ||
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| NU Year | 2011 2013 2015 | ||
| Question | What is multiplexing?Describe synchronous time division multiplexing with figure | ||
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| NU Year | 2011 2014 | ||
| Question | Describe asynchronous transfer mode (ATM) with respect to switching mode, Packet size ATM cells | ||
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| NU Year | 2011 | ||
| Question | State necessity of Frame relay in communication network | ||
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| 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 | ||
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| NU Year | 2011 | ||
| Question | With diagram explain frequency division multiplexing (FDM) | ||
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| NU Year | 2011 | ||
| Question | Distinguish between synchronous and statistical TDM | ||
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| NU Year | 2011 | ||
| Question | Describe advantages and disadvantages of optical fiber and twisted pair cable in brief | ||
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| NU Year | 2011 | ||
| Question | Describe propagation of light through optical fiber | ||
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| NU Year | 2011 | ||
| Question | Write down the difference between simplex and duplex transmission mode with suitable example | ||
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| NU Year | 2013 | ||
| Question | Make a comparison between TCP/IP and OSI | ||
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| NU Year | 2013 | ||
| Question | Distinguish between connection oriented and connectionless protocols | ||
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| NU Year | 2013 | ||
| Question | Define protocol. List the key elements of protocol | ||
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| NU Year | 2013 | ||
96 Name the types of transmission impairments. Briefly explain the different types of noise with exa
| Question | Name the types of transmission impairments. Briefly explain the different types of noise with examples. | ||
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| NU Year | 2013 | ||
| Question | What does the Nyquist theorem and Shannon capacity formula have to do with communications? | ||
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| NU Year | 2013 | ||
98 We have a channel 5KHz bandwidth. If we want to send data at 150 kbps, what is the minimum SNR (d
| Question | We have a channel 5KHz bandwidth. If we want to send data at 150 kbps, what is the minimum SNR (dB)? | ||
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| NU Year | 2013 | ||
| Question | Define frequency, spectrum, bandwidth and buad rate with example. | ||
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| NU Year | 2013 | ||
| Question | What is unguided transmission media? What are the drawback of this? | ||
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| NU Year | 2013 | ||
| Question | Briefly explain ASK, FSK, PSK and QAM techniques with the principle advantages and disadvantages. | ||
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| NU Year | 2013 2014 | ||
| Question | Explain the Pulse Code Modulation (PCM) technique and state its limitation. | ||
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| NU Year | 2013 2015 2014 | ||
| Question | What is optical fiber communication? Explain the characteristics of this communication system | ||
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| NU Year | 2013 | ||
| Question | Explain about virtual circuit and datagram approach of pocket switching network with necessary diagram. | ||
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| NU Year | 2013 | ||
| Question | What is router and routing table? Explain the important characteristics of routing function | ||
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| NU Year | 2013 2015 | ||
| Question | Explain about X~25 protocol standard | ||
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| NU Year | 2013 | ||
| Question | Define multiplexing. What are the different types of multiplexing techniques? | ||
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| 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? | ||
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| NU Year | 2013 | ||
| Question | What is Synchronous Time Division Multiplexing? What are the features of it? | ||
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| NU Year | 2013 | ||
| Question | Compare between the features of FDM and TDM. | ||
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| NU Year | 2013 2015 | ||
| Question | What is switching network? Describe packet switching principles with necessary figure | ||
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| NU Year | 2013 | ||
| Question | Define data communication. Explain the characteristics of data communication system. | ||
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| NU Year | 2015 | ||
| Question | Define analog and digital signal. Briefly explain the different types of noise in data transmission | ||
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| NU Year | 2015 | ||
| Question | What is channel capacity? Briefly describe the Nyquist Bandwidth and Shanon capacity formula | ||
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| NU Year | 2015 | ||
115 Given a channel with an intended capacity of 20 Mbps. The bandwidth of the channel is 3Mhz. What
| 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? | ||
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| NU Year | 2015 | ||
| Question | Define data rate and signal rate | ||
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| NU Year | 2015 | ||
| Question | Describe data encoding & modulation techniques with figures | ||
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| NU Year | 2015 | ||
| Question | Distinguish guided and unguided media with examples. | ||
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| 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 ? | ||
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| NU Year | 2015 | ||
| Question | Define multiplexing.Describe Frequency Division Multiplexing (FDM) | ||
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| 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. | ||
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| NU Year | 2015 | ||
| Question | What is IP address? Classify the IP address of class A, B, C and D network. | ||
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| 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 | ||
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| NU Year | 2015 | ||
| Question | Difference between circuit switching packet switching and ? | ||
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| NU Year | 2014 | ||
| Question | What do you mean by network protocol ? Describe the layers of OSI model | ||
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| NU Year | 2014 | ||
| Question | Define fundamental frequency and channel capacity | ||
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| NU Year | 2014 | ||
| Question | What is relationship between signal's spectrum and its bandwidth? | ||
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| NU Year | 2014 | ||
| Question | For the following digital data sketch the signal waveform using NRZ-L Bipolar .AMI and Manchester encoding scheme for 1011000111001 | ||
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| NU Year | 2014 | ||
| Question | With neat diagram explain the interleaving technique | ||
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| 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? | ||
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| NU Year | 2014 | ||
| Question | Name the advantages of optical fiber over twisted pair and coaxial cable | ||
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| NU Year | 2014 | ||
| Question | How does the propagation differ from line-of sight propagation? | ||
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| Question | How does the sky propagation differ from line-of sight propagation? | ||
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| NU Year | 2014 | ||
| Question | Discuss about wireless transmission waves | ||
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| NU Year | 2014 | ||
| Question | Describe the need for switching and define the switch | ||
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| Question | Describe the need for switching and define a switch | ||
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| NU Year | 2014 | ||
| Question | Compare space division time division switches | ||
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| 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 | ||
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| NU Year | 2014 | ||
| Question | Define Data Communication. Briefly explain the simplified model of data communication. | ||
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| 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. | ||
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| 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. | ||
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| NU Year | 2012 | ||
| Question | Describe ASK, FSK, and PSK with figure. | ||
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| NU Year | 2012 | ||
| Question | Write down the digital signal encoding format. | ||
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| 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. | ||
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| NU Year | 2012 | ||
| Question | Write short notes:- TCP/IP. | ||
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| NU Year | 2012 | ||
| Question | Write short notes:-Channel capacity. | ||
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| NU Year | 2012 | ||
| Question | Write short notes:- Wireless transmission. | ||
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| NU Year | 2012 | ||
| Question | define that- CRC, Digital switch, Packet Switching Networks. | ||
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| NU Year | 2012 | ||
| Question | Define Standard. State and explain the characteristics of data communication system. | ||
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| 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. | ||
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| NU Year | 2012 | ||
| Question | Describe asynchronous transfer mode (ATM) with respect to switching mode, Packet size, ATM cells. | ||
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| NU Year | 2012 | ||
| Question | State necessity of Frame Relay in communication network. | ||
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| NU Year | 2012 | ||
| Question | Distinguish between synchronous statistical TDM. | ||
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| NU Year | 2012 | ||
| Question | With diagram describe the architecture of a three stage space division switch. | ||
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| 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. | ||
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| 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). | ||
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| NU Year | 2010 | ||
| Question | Construct the Hamming code for the bit sequence 10011101. | ||
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| 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. | ||
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| NU Year | 2010 | ||
| Question | What is crossbar switch? What is its major limitation? Explain how a multistage switchovercomes the limitations of the crossbar switch. | ||
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| NU Year | 2010 | ||
| Question | Explain satellite transmission with VSAT configuration. | ||
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| NU Year | 2010 | ||
| Question | What are the important applications of satellite? | ||
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| NU Year | 2010 | ||
| Question | What is the base of pulse code modulation? Why delta modulation is used? | ||
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| 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. | ||
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| Question | What is flow control? Describe the process of stop and wait control with necessarydiagram. | ||
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| NU Year | 2010 | ||
| Question | Explain the operation of stop and wait ARQ error control method in case of lost anddamages frames. | ||
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| 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? | ||
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| 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. | ||
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| NU Year | 2010 | ||
| Question | Briefly describe major communication task that involved in data communication. | ||
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| NU Year | 2010 | ||
| Question | Distinguish between LAN and WAN. | ||
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| NU Year | 2010 | ||
| Question | What do you mean by network protocol? Compare TCP/IP protocol suite and OSIreference model. | ||
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| NU Year | 2008 | ||
| Question | Define the term frequency, spectrum and bandwidth of a signal. | ||
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| NU Year | 2008 | ||
| Question | What are major transmission impairments? Explain. Write down about thermal noise. | ||
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| 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. | ||
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| NU Year | 2008 | ||
| Question | Name the common guided transmission media and give the physical description,application areas and transmission characteristics of one of them. | ||
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| NU Year | 2008 | ||
| Question | Write down the advantage of packet switching over a circuit switching. | ||
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| NU Year | 2008 | ||
| Question | Distinguish between datagram and virtual circuit with diagram. | ||
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| 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) | ||
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| NU Year | 2008 | ||
| Question | What are three popular ARQ mechanisms for error control in data communications? | ||
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| NU Year | 2008 | ||
| Question | How does ARQ correct an error? | ||
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| 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. | ||
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| NU Year | 2008 | ||