EC-803-A Wireless Networks - May 2022 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
   aGive a brief introduction on Wireless networks. Discuss about the characteristics of Wireless medium.
   How to answer

   • Define wireless networks and types
   • Characteristics of wireless medium: broadcast, multipath, mobility, limited bandwidth
   • Challenges: interference, fading, security
2. 7 Marks
   bExplain the effect of Multipath and Doppler in wireless network.
   How to answer

   • Define multipath fading and Doppler shift
   • Effects: ISI, frequency dispersion, BER degradation
   • Mitigation examples
3. 7 Marks
   aDraw and explain the basic block diagram of UMTS.
   How to answer

   • Draw UMTS block diagram: UE, UTRAN, Core Network
   • Explain functions of Node B, RNC, MSC, SGSN
   • Interfaces Uu, Iu
4. 7 Marks
   bExplain the differences between WLAN and MAC layer with suitable examples.
   How to answer

   • Define WLAN and MAC layer role
   • Differences in function, protocols, examples 802.11
   • Suitable examples for channel access
5. 7 Marks
   aGive a brief introduction on 3 GPP. Explain its practical applications.
   How to answer

   • Define 3GPP: organization, purpose, releases
   • Evolution to LTE, 5G
   • Practical applications in cellular standards
6. 7 Marks
   bDraw and explain the architecture of mobility and resource management. Explain its different hierarchies.
   How to answer

   • Draw mobility and resource management architecture
   • Explain handover, location management
   • Explain hierarchies: cell, location area, network
7. 7 Marks
   aDraw and explain the WSN architecture. Describe the practical needs for WSN coverage and its placement.
   How to answer

   • Draw WSN architecture: sensor nodes, sink, gateway
   • Explain layered/protocol stack
   • Coverage needs and placement strategies
8. 7 Marks
   bClassify and explain the different technologies used for sensor nodes and its network.
   How to answer

   • Classify sensor node technologies: sensing, processing, radio
   • Network technologies: ZigBee, Bluetooth, etc.
   • Explain with examples
9. 7 Marks
   aExplain the problems counter by users while using medium access in wireless networks.
   How to answer

   • Define medium access problems: hidden, exposed terminal
   • Near-far, collisions in wireless
   • Impact on throughput and fairness
10. 7 Marks
    bBriefly explain the security of WSN networks in recent technologies.
    How to answer

    • WSN security requirements: confidentiality, authentication
    • Recent threats and attacks
    • Recent techniques: encryption, key management
11. 7 Marks
    aCompare and explain the architecture of IPv4 and IPv6.
    How to answer

    • Draw IPv4 and IPv6 header architectures
    • Compare address size, header fields, features
    • Advantages of IPv6
12. 7 Marks
    bWhat do you mean by congestion window management? Explain its practical consequences.
    How to answer

    • Define congestion window, slow start, AIMD
    • Management mechanisms in TCP
    • Practical consequences: throughput, fairness
13. 7 Marks
    aDraw and explain IoT architecture.
    How to answer

    • Draw IoT layered architecture: perception, network, application
    • Explain sensors, gateway, cloud
    • Data flow example
14. 7 Marks
    bElaborate the main design principles and needed capabilities of IoT structure.
    How to answer

    • List design principles: scalability, interoperability
    • Needed capabilities: sensing, connectivity, intelligence
    • Elaborate with examples
15. 7 Marks
    aExplain some of the emerging IoT standards helpful for networking engineer.
    How to answer

    • List emerging IoT standards: MQTT, CoAP, 6LoWPAN
    • Role for networking engineer
    • Use cases
16. 7 Marks
    bDiscuss the comparison between the Interface of 802.11 and Bluetooth.
    How to answer

    • Introduce 802.11 and Bluetooth interfaces
    • Compare on range, data rate, power, topology
    • Applications suitability