IT-602 Wireless and Mobile Computing - Dec 2024 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aWhat is an Antenna? Draw and explain any two types of antennas.
   How to answer

   • Definition of antenna as transducer for EM waves
   • Diagram of two types e.g. dipole / loop / parabolic / microstrip
   • Working / radiation pattern of each
   • Applications / characteristics
2. 7 Marks
   bCompare between SDMA, TDMA, FDMA and DAMA.
   How to answer

   • Basis of multiplexing: space / time / frequency / demand assignment
   • Principle of SDMA, TDMA, FDMA, DAMA each
   • Comparison table on parameters
   • Use cases in mobile systems
3. 7 Marks
   aDraw and explain the architecture of cellular system. What is Hand off?
   How to answer

   • Cellular concept with cells, cluster, MSC, BS, MS
   • Neat labelled architecture diagram
   • Function of components
   • Definition and types of handoff / handover
4. 7 Marks
   bDiscuss the various effects of mobile radio propagation.
   How to answer

   • Path loss, shadowing, multipath fading concepts
   • Effects: reflection, diffraction, scattering, Doppler shift
   • Small-scale vs large-scale effects
   • Impact on signal strength and quality
5. 7 Marks
   aExplain the Architecture of GPRS.
   How to answer

   • GPRS as packet data over GSM
   • Architecture diagram with SGSN, GGSN, PCU, HLR
   • Interfaces and functions
   • Data flow
6. 7 Marks
   bDiscuss the different types of mobile services provided by GSM? Explain each in brief.
   How to answer

   • Bearer, teleservices, supplementary services in GSM
   • Voice, SMS, data, fax examples
   • Brief features of each category
   • Diagram of service classification
7. 7 Marks
   aWhy do we need wireless LAN explain architecture of 802.11 LAN?
   How to answer

   • Need: mobility, flexibility, no cabling
   • 802.11 components: STA, AP, BSS, ESS, DS
   • Architecture diagram infrastructure vs ad-hoc
   • Protocol layers overview
8. 7 Marks
   bExplain HIPERLAN protocol in detail.
   How to answer

   • HIPERLAN as ETSI high-speed WLAN standard
   • Types HIPERLAN/1, HIPERLAN/2
   • Protocol stack and MAC / DLC layers
   • Features and comparison with 802.11
9. 7 Marks
   aComment on physical and MAC layer of Bluetooth technology.
   How to answer

   • Bluetooth radio / physical layer: FHSS, 2.4 GHz
   • MAC layer: piconet, scatternet, master-slave
   • Packet formats and states
   • Diagram of layers
10. 7 Marks
    bWhat are the principle responsibilities of MAC protocol?
    How to answer

    • MAC functions: medium access, framing, addressing
    • Collision avoidance, QoS, power management
    • Reliability and synchronization
    • Examples in wireless context
11. 7 Marks
    aDifferentiate indirect TCP, snooping TCP and mobile TCP.
    How to answer

    • Indirect TCP: split connection via proxy
    • Snooping TCP: transparent caching at base station
    • Mobile TCP: modified retransmission / disconnection handling
    • Comparison table
12. 7 Marks
    bWhat is DHCP? How does DHCP support dynamic address allocation?
    How to answer

    • Definition of DHCP and purpose
    • DORA process: discover, offer, request, ack
    • Lease concept and dynamic reuse
    • Support for mobility
13. 7 Marks
    aWrite and explain firewall design principles.
    How to answer

    • Firewall concept and need
    • Design principles: least privilege, choke point, fail-safe
    • Packet filter vs proxy vs stateful
    • Diagram of placement
14. 7 Marks
    bWhat are the different methods of password management?
    How to answer

    • Password threats and need for management
    • Methods: aging, complexity, lockout, salting/hashing
    • Two-factor, password managers
    • Policy examples
15. 14 Marks
    Write short notes on the following.

    1. a)Mobile IP
    2. b)TETRA
    3. c)Intruders
    How to answer

    • Mobile IP: home/foreign agent, tunneling, care-of address
    • TETRA: trunked radio system features and architecture
    • Intruders: types, detection, prevention
    • Applications for each