Bachelors Level/Second Year/Fourth Semester/Science bit/fourth semester/network and data communications/syllabus wise questions
Bachelors In Information Technology
Institute of Science and Technology, TU
Network and Data Communications (BIT254)
Year Asked: Model, syllabus wise question
Data link layer
1.
What is MAC-address? The message sequence is 11001000 and generator polynomial G(X) = $x^3 + x + 1$. Calculate the transmitted encoded frame [5]
Fundamental of Data Communication
1.
Explain different layers of OSI [5]
Network layer
1.
Explain leaky-bucket algorithm. Illustrate with an example. What are its advantages and disadvantages? [10]
2.
Differentiate between circuit switching and packet switching. What are their practical implications? [5]
3.
Explain about ARP operation. [5]
4.
Briefly explain recursive resolution, iterative resolution and caching [5]
5.
List one difference between open-loop and closed-loop congestion control. Explain acknowledgement policy and discarding policy [5]
Physical Layer and Media
1.
Explain TDMA, FDMA and WDMA with necessary diagrams. Represent bit sequence 100101011 by the following waveform: NRZ-L, NRZ-I, Manchester, Differential Manchester [10]
2.
Briefly explain satellite network. Consider a noiseless channel with a bandwidth of 3400 Hz transmitting a signal with two signals. Calculate the maximum bit rate [5]
3.
Write short notes on Attenuation and SNMP [5]
Transport layer
1.
Explain the procedure for pure ALOHA. Highlight the vulnerable time of pure ALOHA. A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the requirement to make this frame collision-free? [10]
2.
Describe user datagram format. List at least four ports used with UDP [5]