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Download DU (University of Delhi) B-Tech 3rd Semester 1567 Data Communication and Computer Networks Question Paper

Download DU (University of Delhi) B-Tech (Bachelor of Technology) 3rd Semester 1567 Data Communication and Computer Networks Question Paper

This post was last modified on 31 January 2020

MU-Mumbai University MCA Last 10 Years 2010-2020 Question Papers || University of Mumbai


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This question paper contains 4 printed pages

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Roll No.

S. No. of Question Paper : 1567

Unique Paper Code : 2341302

Name of the Paper : Data Communication and Computer Networks

Name of the Course : B.Tech. in Computer Science

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Semester : V

Duration : 3 Hours Maximum Marks : 75

(Write your Roll No. on the top immediately on receipt of this question paper.)

Attempt all the questions.

  1. Write the layer in OSI Model that performs the following functions : 2
    1. Route determination
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    3. Flow control
    4. Mechanical and electrical interface
    5. Reliable process-to-process data transportation
    6. Reassembly of data packets
    7. Error correction and retransmission.
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  2. Explain the following :
    1. Does the Nyquist theorem bit rate agree with the intuitive bit rate described in baseband transmission ? 3
    2. The signal-to-noise ratio is often given in decibels. Assume that SNRdB = 36 and the channel bandwidth is 2 MHz. Calculate the theoretical channel. 3
    3. An analog signal carries 4 bits per signal element. If 1000 signal elements are sent per second, find the bit rate. 2
    4. Differentiate between binary PSK and Quadrature PSK.
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  3. Briefly describe the following :
    1. Three phases required for the actual communication in a circuit-switched network. 3
    2. If there are no setup or teardown phases, how are the packets routed to their destinations in a datagram network ? 3
    3. Draw the pulse diagram for the bit stream 101110001011 for the following encoding technique : 6
      1. NRZ-L
      2. Manchester
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      4. Differential Manchester.
    4. How do multiple senders share the common transmission media in a network. List three techniques commonly used for this purpose. 4
    5. Explain bridge, router and gateway. 3
    6. Suppose a computer is moved from one building to another within a campus. Does the physical address need to change ? Does the IP address need to change ? Does it make a difference if the computer is a laptop ? Justify your answer. 3
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    1. Explain header field in IP protocol with diagram.
    2. An organization has been assigned the network address : 140.25.0.0 and it needs to create a set of subnets that support upto 25 hosts on each subnet. What is the subnet mask you would use to do this ? 3
    3. What is the maximum possible number of such subnets in the given network ? The use of special address must be avoided. 2
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  5. What is the difference between a connection-oriented service and a connectionless service ? For each of the following tell whether it might be a connection oriented service, a connectionless service, both or neither : 2+3
    1. Connection establishment
    2. Data transmission
    3. Connection release.
    1. Write the port number of the following protocols : 2
      1. FTP
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      3. HTTP
      4. TELNET
      5. SMTP.
    2. What is DNS and how it resolves IP Address from URL ? 4
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  6. Write short notes on any six of the following : 3x6=18
    1. ARQ
    2. Selective repeat ARQ
    3. TDM
    4. FSK
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    6. Hamming code
    7. CRC
    8. Packet switching
    9. Exponential back off algorithm
    10. Coaxial Cable Standards.
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