CY-803-A Mobile and Wireless Security - May 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
   aDiscuss the evolution of Wi-Fi standards and their implications on wireless networking trends?
   How to answer

   • Evolution of IEEE 802.11 standards: a/b/g/n/ac/ax with rates and bands
   • Key enhancements: MIMO, channel bonding, MU-MIMO, OFDMA
   • Implications: throughput, mobility, IoT, enterprise and hotspot trends
2. 7 Marks
   bWhat is a Wireless Personal Area Network (WPAN) and what distinguishes it from other types of wireless networks?
   How to answer

   • Definition of WPAN: short-range personal area connectivity
   • Characteristics: range, data rate, power, topology
   • Distinction from WLAN, WMAN, WWAN with examples like Bluetooth, Zigbee
3. 7 Marks
   aExplain the physical layer of WiMAX, including the modulation techniques and frequency bands it operates in.
   How to answer

   • WiMAX physical layer overview and OFDM/OFDMA basis
   • Modulation techniques: BPSK, QPSK, 16-QAM, 64-QAM adaptive
   • Frequency bands: licensed and unlicensed bands, duplexing
4. 7 Marks
   bWhat are the key differences between Mobile IPv4 and Mobile IPv6?
   How to answer

   • Mobile IPv4 approach: home agent, foreign agent, tunneling
   • Mobile IPv6 enhancements: route optimization, no foreign agent, IPsec
   • Key differences in header, address auto-configuration and efficiency
5. 7 Marks
   aExplain the difference between proactive, reactive and hybrid routing protocols used in Ad Hoc Networks.
   How to answer

   • Proactive: table-driven, e.g., DSDV, OLSR - low latency, overhead
   • Reactive: on-demand, e.g., AODV, DSR - route discovery
   • Hybrid: e.g., ZRP combining zones, trade-offs
6. 7 Marks
   bExplain the concept of multi-hop relay in wireless communication and its significance in Mesh Networks.
   How to answer

   • Concept of multi-hop relay: intermediate nodes forwarding
   • Benefits: coverage extension, energy saving, reliability
   • Significance in Mesh Networks: self-healing, scalability
7. 7 Marks
   aWhat are the key differences between 3G and 4G networks in terms of technology and performance?
   How to answer

   • 3G technologies: CDMA, UMTS, data rates up to Mbps
   • 4G technologies: LTE, OFDM, MIMO, all-IP
   • Performance comparison: speed, latency, capacity, services
8. 7 Marks
   bWhat are the key features and capabilities of GPRS, and how do they support mobile data services?
   How to answer

   • GPRS as packet-switched extension of GSM
   • Features: always-on, billing, data rates, classes
   • Support for mobile data: WAP, MMS, internet access
9. 7 Marks
   aWhat is RFID? Explain the principle of operation behind RFID technology and how data is transmitted between RFID tags and readers.
   How to answer

   • Definition of RFID and components: tags, readers, antenna
   • Principle: electromagnetic coupling, backscatter
   • Data transmission between passive/active tags and readers
10. 7 Marks
    bWhat is LTE? What are the key features and benefits of LTE technology?
    How to answer

    • LTE definition as 4G standard, all-IP architecture
    • Key features: OFDMA, MIMO, low latency, high data rate
    • Benefits: capacity, QoS, support for broadband services
11. 7 Marks
    aDiscuss the primary objectives of military security models and explain the role of hierarchical command structures in the model.
    How to answer

    • Objectives: confidentiality, integrity, multilevel security
    • Military models: Bell-LaPadula, Biba
    • Role of hierarchical command structures and clearance levels
12. 7 Marks
    bWhat is the purpose of an encapsulation header in IPv4 and IPv6 packets? Compare and contrast the structure of the encapsulation headers in IPv4 and IPv6.
    How to answer

    • Purpose of encapsulation: mobility tunneling, e.g., IP-in-IP
    • IPv4 encapsulation header structure
    • IPv6 structure, extension headers and comparison
13. 7 Marks
    aWhat is e-commerce and how has it transformed traditional business practices?
    How to answer

    • Definition of e-commerce: types B2B, B2C, C2C
    • Transformation: global reach, 24x7, supply chain
    • Impact on traditional business: cost, intermediaries, customer experience
14. 7 Marks
    bWhat are electronic payment systems, and how do they facilitate financial transactions over electronic networks?
    How to answer

    • Definition and types: cards, e-wallets, net banking
    • Working over electronic networks: authentication, clearing
    • Facilitation: security, speed, global transactions
15. 14 Marks
    Write a short note on any two :

    1. a)Wireless Local Area Network
    2. b)TCP over Wireless Networks
    3. c)Universal Mobile Telecommunication System (UMTS)
    4. d)Denial of service
    How to answer

    • WLAN: 802.11 architecture, modes and security
    • TCP over wireless: challenges and solutions like I-TCP
    • UMTS architecture / DoS attacks, prevention in wireless context