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 indicate full O

1. Q3 Illustrations, in ( in-depth answers and dj
   • (4) Mixing of will be appreci sub-questions is not allowed, Oo 1, Attempt the following (any three)
   • (a) Write a short note on Bus topology? Define protocol? Explain the key elements of protocol?
   • (c) Name the layer of the OSI model ible for the responsible for the followi ctions :
   • (i) Layer communicators directly with user' With user's program
   • (ii) Layer defines mechanical, electrical and interface
   • (iii) Layer defines mechanical, electrical and fu interface
   • (v) Layer establishes, manages and sessions
   • (d) Define network throughput. AD A_ network can pass only 1200 frames with each frame Calculate the throughput of this in bits/sec?
   • (e) Explain Binary amplitude in detail
2. Q2 Attempt the thre the equency division multiplexing (FDM) Assume that a occupies a bandwidth of 400Hz. We need to multiplex 10 vojée channels with guard bands of 10Mz. using FDM. Calculate
   • (b) Whatis spectrum technique? List the two techniques to spread the bandwidth. Give two advantages of spread spectrum technique
   • (c) explain the structure of coaxial cable
   • (d) wie any three advantages and two disadvantages of optical fibre cable
   • (e) What is circuit switched network? Explain the setup, data transfer and tear down of circuit switching What is digital subscriber line (DSL)? Give the characteristics of ADSL and
3. Q3 Attempt the following (any three)
   • (a) Explain the error detection process used by CRC?
   • (b) terms and show the relation among them
   • (c) What is Hamming distance? How Hamming distance is used for error and error correction? Calculate the Hamming distance for d( 00000,
   • (d) Describe the frame structure of Point-to-point Protocol (PPP)
   • (e) List the fields of control -frame of HDLC protocol. Write one use of field (£) How data flow is controlled using stop and wait protocol?
4. Q4 Attempt the following (any three) Explain token passing medium access mechanism 15 marks
   • (b) What are goals of fast ethernet?
   • (c) Describe the hidden station problem in wireless the solution for the
   • (d) Explain the Bluetooth network architectures
   • (e) What is hand offin wireless mobile the hard and the soft
   • (f) State the layer/layers at which following device operates. Give one reason to support your answer
5. Q5 Attempt the following (any three
   • (a) Whatare the four characteristics of Data Communication?
   • (b) Write short note
   • (c) State and erent types of persistent methods in CSMA the acteristics that can be used to group stations ina VLAN?
   • (e) Explain functions of data link layer of OSI model
   • (f) Whatis and how does it function?

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