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IT-604 (C) · Wireless Sensor Networks/Important Questions

Wireless Sensor Networks (IT-604 (C)) - Important Questions

  1. Unit 57 Marks High Priority Asked: 2022, 2025

    Define the fundamentals of network security for wireless sensor networks (WSNs). Explain the security goals such as confidentiality, integrity, availability, authentication, freshness and non-repudiation in the context of WSNs.

    Core topic from Unit 5; appears repeatedly in analytics as a fundamental area for WSN security.

  2. Unit 510 Marks High Priority Asked: 2022, 2025

    List typical security threats to sensor networks and explain key countermeasures provided by IEEE 802.15.4 and ZigBee security layers.

    Directly maps to frequent analytics topic: protocol-level security for low-power WSN standards.

  3. Unit 514 Marks High Priority

    Describe major security attacks against wireless sensor networks including Sybil attack, wormhole attack, sinkhole attack, selective forwarding, blackhole, hello flood and jamming. For each attack give an explanation and at least one mitigation technique.

    High-importance enumeration and mitigation question; common exam pattern for Unit 5.

  4. Unit 510 Marks High Priority

    Explain the IEEE 802.15.4 security architecture and ZigBee key management mechanisms. Describe how symmetric keys are distributed and what security services are provided at the MAC and network layers.

    Covers protocol architecture and key management which is central to ZigBee/802.15.4 security discussions.

  5. Unit 57 Marks Low Priority

    Compare contention-based and contention-free MAC protocols for wireless sensor networks, discussing trade-offs in energy consumption, latency and scalability. Give a practical scenario where each type is preferable.

    Standard comparative question testing understanding of MAC design trade-offs in wireless sensor deployments.

  6. Unit 510 Marks Medium Priority

    Explain secure routing strategies for WSNs. Describe the working principles, security features and limitations of at least two secure routing protocols such as SPINS, INSENS or SRP.

    Covers secure routing — a core Unit 5 topic linking security and network-layer design for WSNs.

  7. Unit 57 Marks Medium Priority

    Discuss node authentication and key distribution schemes for wireless sensor networks. Explain pairwise, group and network-wide keying approaches and their advantages and limitations.

    Focuses on authentication and key distribution patterns critical in resource-constrained WSNs.

  8. Unit 57 Marks Medium Priority

    Describe intrusion detection techniques suitable for wireless sensor networks. Compare signature-based and anomaly-based approaches and give an example of an anomaly detection metric used in WSNs.

    Addresses detection and response — an important but less frequently directly asked area in Unit 5.

  9. Unit 510 Marks Low Priority

    Discuss power conservation mechanisms across the physical, MAC and network layers in wireless sensor networks. Quantify their impact on node lifetime in a simple numerical example (assume appropriate duty cycle and transmission power values).

    Cross-layer energy security question linking power conservation to security design decisions — relevant to Unit 5 learning outcomes.

  10. Unit 57 Marks Low Priority

    Describe techniques for node localization in wireless sensor networks. Compare time of arrival (TOA), time difference of arrival (TDOA) and RSSI-based methods and list practical limitations of each.

    Localization techniques are sometimes linked to security (spoofing, authentication) and are useful conceptual questions for Unit 5.

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