BSc CS Sem 5 BSc CS Semester 5 (2014 2015) 2015 DCN Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indiacte full marks

1. Q1 Discuss in brief different digital to analog Conversion techniques Attempt the following (Any three) 5 Write a short note on FHSS.
   • (b) Discuss different propagation Modes of optical fibre E Explain wavelength Division Multiplexing Discuss the structure of packet Switch State and explain characteristics of virtual circuit networks
   • (f) Explain the interleaving process in TDM? A multiplexer combines four 200 kbps Channels using time slot of 2 bits. show the output with four arbitrary inputs. Calculate
2. Q3 Attempt the following (Any three) 5 marks
   • (a) Explain two dimensional parity check hence delect the error in transmission of 101010, 11111, 110011 when recieved is 101110, 11111, 000111
   • (b) Explain Go Back N ARQ. Discuss the error case of lost Ack Frame
   • (c) Write a short note on CRC. List advantages of the same
   • (d) HDLC? explain S- frame in detail
   • (e) State arid explain PPP transition states
   • (f) Discuss Bit stuffing and unstuffing with example
3. Q4 Attempt the following (Any three)
   • (a) Explain the loop problem in learning bridge State and explain different backbone networks
   • (c) Discuss the folowing Concept of Cellular telephony
   • (i) re-use
   • (d) Explain hidden and exposed station problem
   • (e) Discuss the structure of MAC frame Explain CSMA/CD technique in detail
4. Q5 Attemptthe following (Any three)
   • (a) State and explain duties of datalink layer
   • (b) Write a short note on
   • (c) State and explain different types of bit errors Write a short note on reservation method of Controlled access technique Explain different types of transmission impairments
   • (f) note on CDMA technology

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