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WorksheetsWSN ISE- II (2025-26)
Total questions: 20
Worksheet time: 20mins
In the PAMAS protocol, nodes use a separate signaling channel primarily to:
Increase bandwidth efficiency
Avoid interference between data and control packets
Synchronize time among nodes
Improve packet aggregation efficiency
Which of the following statements is TRUE about contention-based protocols in WSNs?
They require precise synchronization among all nodes
They eliminate collisions completely
They operate efficiently in dynamic topologies
They require cluster-head election in every round
In PAMAS, a node avoids overhearing other transmissions by:
Entering a low-power sleep state when neighbors are active
Using TDMA scheduling
Employing multi-hop routing
Using frequency hopping
LEACH protocol improves energy efficiency by:
Using RTS/CTS handshaking
Dynamic clustering and periodic rotation of cluster heads
Using contention-free access
Employing multiple frequency channels
Which of the following statements about the Mediation Device Protocol (MDP) in WSNs is correct?
It uses a contention-based approach similar to CSMA/CA.
It acts as an intermediary to manage communication between heterogeneous sensor networks.
It relies solely on TDMA scheduling to reduce collisions.
It replaces cluster-heads with relay nodes for routing efficiency.
The IEEE 802.15.4 MAC protocol uses which of the following channel access mechanisms?
Pure ALOHA
Slotted CSMA/CA
TDMA with centralized scheduling
CDMA-based contention resolution
In contention-based MAC protocols, the hidden node problem can lead to:
Increased throughput
Data packet collisions
Improved latency
Reduced control overhead
Which of the following is NOT a design challenge in transport layer protocols for WSNs?
Energy constraints
Congestion control
Reliable packet delivery
Frequency hopping synchronization
In IEEE 802.15.4, the superframe structure is used mainly to:
Increase throughput using FDMA
Enable node authentication
Provide a balance between contention and contention-free periods
Avoid packet fragmentation
In LEACH, the role of the cluster head is NOT to:
Aggregate data from member nodes
Route data between clusters
Assign time slots to member nodes
Communicate directly with the base station
The black hole attack in WSN primarily affects which layer?
Physical layer
MAC layer
Network layer
Application layer
During a jamming attack, the attacker targets which layer of the WSN?
To protect WSNs from tampering attacks, which of the following is the most effective measure?
Encrypting routing headers
Using TDMA scheduling
Implementing hardware-based tamper-resistant packaging
In WSN security, Sybil attack refers to:
A node that jams multiple frequencies simultaneously
A malicious base station that drops all incoming packets
A routing loop caused by node compromise
A node that assumes multiple fake identities within the network
Which of the following techniques can mitigate flooding attacks in WSNs?
Data aggregation at the sink only
Increasing transmission power
Limiting the number of route request messages per node
Using CDMA access
A wormhole attack occurs when:
Nodes refuse to forward packets to the sink
A compromised node sends false sensor data
A node floods the network with route requests
Two malicious nodes create a low-latency tunnel to replay packets
A flooding attack in WSNs mainly leads to:
Reduced channel bandwidth
Increased cluster head rotation
Reduced channel bandwidth
Improved packet delivery ratio
Which of the following is the most effective countermeasure against jamming?
Frequency hopping or spread spectrum
Packet encryption
Multi-path routing
The sinkhole attack differs from the black hole attack primarily because
Sinkhole is passive, while black hole is active
inkhole drops packets randomly; black hole drops selectively
Sinkhole attracts traffic using falsified routing metrics; black hole drops all packets
Sinkhole targets MAC layer; black hole targets application layer
In energy-efficient routing, a data-centric approach such as Directed Diffusion is used because:
