adhoc and wireless sensor network nptel assignment answers (1).pdf

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Courses » Wireless Adhoc And Sensor Networks
Unit 2 - Week 1:
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Week 1:
Week 2
Week 3
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Week 5
Week 6
Lecture 1:
Introduction:
Wireless Ad
Hoc Networks-
Part- I
Lecture 2:
Introduction:
Wireless Ad
Hoc Networks-
Part- II
Lecture 3: Self-
organizing
Behaviour of
Wireless Ad
Hoc Networks
Lecture 4:
Cooperation in
Mobile Ad Hoc
Networks- Part-
I
Lecture 5:
Cooperation in
Mobile Ad Hoc
Networks- Part-
II
Week 1 Lecture
Material
Quiz :
Assignment
Week 1
Assignment
Solution Week 1
Due on 2018-02-21, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 1
The due date for submitting this assignment has passed.
As per our records you have not submitted this assignment.
A wireless network without a centralized access point may be:
An infrastructure network
An ad hoc network
All of these
None of these
No, the answer is incorrect.
Score: 0
Accepted Answers:
An ad hoc network
Which of the following technologies enable wireless ad-hoc networking
ZigBee
4G(LTE)
All of the above
None of these
Score: 0
Accepted Answers:
ZigBee
The self-properties of self-organization networks are known by the acronym
Self-POT
Self-CHOP
Self-CHAP
Self-COAT
Score: 0
Accepted Answers:
Self-CHOP
The main source of power consumption in wireless sensor networks is due to
Sensing
Transmitting
Processing
None of these
EC8702 Ad hoc and Wireless Sensor Networks
Multiple Choice Questions
NPTEL - Online Assignments
EC8702 - MCQ Page: 1

27/07/2020 Wireless Adhoc And Sensor Networks - - Unit 2 - Week 1:
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Transmitting
Throughput in wireless ad hoc networks with N nodes decreases at a rate of
√N
N^2
N^3
2N
Score: 0
Accepted Answers:
√N
In Sprite, a selfish node may save a receipt but does not forward the message. What is the
countermeasure for this selfish action?
The CCS charges the sender an extra amount of credit
The CCS gives more credit to a node that forwards a message than the node which does not
The credit of each node is multiplied by a fraction r, where r < 1
The non-forwarding node is charged with an extra amount of credit
Score: 0
Accepted Answers:
The CCS gives more credit to a node that forwards a message than the node which does not
The nodes which are unable to perform an operation because of either power failure or
environmental events are termed as
Selfish node
Failed nodes
Dead node
Malicious node
Score: 0
Accepted Answers:
Failed nodes
The types of reputations used in the CORE are
Objective, direct, and functional
Subjective, indirect, and functional
Subjective, indirect, and non-functional
Subjective, direct, and non-functional
Score: 0
Accepted Answers:
Subjective, indirect, and functional
Sprite is a system based on credit, which is used to provide ___________ for mobile nodes
to cooperate and report actions honestly.
Penalty
Bit coin
Incentives
Acknowledge
Score: 0

27/07/2020 Wireless Adhoc And Sensor Networks - - Unit 2 - Week 1:
1 point
10)
Accepted Answers:
Incentives
Nodes which deliberately disrupt the correct operation of the routing protocol are known as:
Selfish nodes
Failed nodes
Badly failed nodes
Malicious nodes
Score: 0
Accepted Answers:
Malicious nodes
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27/07/2020 Wireless Adhoc And Sensor Networks - - Unit 3 - Week 2
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Unit 3 - Week 2
Course
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Week 1:
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Lecture 6: MAC
Protocols in
MANETs- Part- I
Lecture 7: MAC
Protocols in
MANETs- Part-
II
Lecture 8:
Routing in
MANETs- Part- I
Lecture 9:
Routing in
MANETs- Part-
II
Lecture 10:
Routing in
MANETs- Part-
III
Week 2: Course
Material
Quiz :
Assignment
Week 2
Assignment
Solution Week 2
Due on 2018-02-21, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 2
RTS/CTS period is called
Waiting period
Contention period
Running period
None of these
Score: 0
Accepted Answers:
Contention period
Existing MAC protocols cannot be used in MANETs because of --
Resource constrained nodes
Limited bandwidth
Lack of centralized control
All of the above
Score: 0
Accepted Answers:
All of the above
FPRP is a –
Synchronous and contention based protocol
Asynchronous and contention based protocol
Contention based protocol without reservation mechanism
Contention based Protocols with scheduling mechanism
Score: 0
Accepted Answers:
Synchronous and contention based protocol
In MACAW, Data Sending (DS) frame is of size
120 Bytes
30 Bytes
23 Byte
35 Byte

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30 Bytes
Which is a hybrid routing protocol:
DSR
AODV
ZRP
None of the above
Score: 0
Accepted Answers:
ZRP
An example of mesh-based routing protocol is:
QAMNET
QMR
ODMRP
All the above
Score: 0
Accepted Answers:
All the above
When a group of nodes are required to contact, which type of the following routing is useful?
Multicast
Unicast
Broadcast
None of these
Score: 0
Accepted Answers:
Multicast
Join query and join reply are used by which of the following multicast routing protocol?
ODMRP
QAMNET QMR ZMR
QMR
ZMR
Score: 0
Accepted Answers:
ODMRP
The routing scheme which use both the mask and destination address as 0.0.0.0 is:
Network-specific
Default
Host-specific
None of the above
Score: 0
Accepted Answers:
Network-specific

1 point
10)
MARCH exploits the properties of ___________ antennas and overhearing properties of
MANETs.
Single directional
Bi-directional
Omnidirectional
None of these
Score: 0
Accepted Answers:
Omnidirectional
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Unit 4 - Week 3
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Week 1:
Week 2
Week 3
Week 4
Week 5
Week 6
Lecture 11:
Multicasting in
MANETs
Lecture 12:
Mobility Models
for MANETs
Lecture 13:
Transport
Protocols for
MANETs- Part- I
Lecture 14 :
Transport
Protocols for
MANETs- Part-
II
Lecture 15:
Opportunistic
Mobile
Networks- Part-
I
Week 3 Lecture
Material
Feedback for
week 3
Quiz :
Assignment
Week 3
Assignment
Solution Week 3
Due on 2018-02-28, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 3
In TCP-ELFN, CWND = 1 causes No significant change, because –
Optimal window is relatively small
It is similar to No change
Default value of RTO is small
All of these
Score: 0
Accepted Answers:
Optimal window is relatively small
Stochastic mobility models are
Less complex
Highly diversified
Hard to realize
All of these
Score: 0
Accepted Answers:
Less complex
For testing the performance of the ad-hoc network, most accurate approach is
Simulated
Analytics
Test bed
None of these
Score: 0
Accepted Answers:
Test bed
Complexity is a measure of the ______________ required to produce the traces for the
simulation.
Driver
Electricity
Computational resources
None of these

Week 7
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Computational resources
When ATCP encounters 3 duplicate ACKs, it puts TCP in ______________.
Active mode
Persist mode
Idle mode
Waiting mode
Score: 0
Accepted Answers:
Persist mode
When ATCP is in the lossy state, reception of an ECN or ICMP message will move ATCP into
which of the following state?
Free
Congested
Forward
None of these
Score: 0
Accepted Answers:
Congested
After receiving 3 duplicate ACKs, following incident occurs --
ATCP puts TCP into persist mode
ATCP into loss state
ATCP into congested state
ATCP puts TCP into persist mode and ATCP into loss state
Score: 0
Accepted Answers:
ATCP puts TCP into persist mode and ATCP into loss state
In TCP-F, when a routing agent detects the disruption of a route, it explicitly sends a
_________ packet to the sender.
Route Failure Notification
Route Formations Notification
Route Disruption Notification
Transmission Success Notification
Score: 0
Accepted Answers:
Route Failure Notification
In TCP-BuS, to avoid timeout events during the route re-construction (RRC) phase, the
timeout values for buffered packets from source to PN will be
Set to one
Doubled
Same
Half
Score: 0

1 point
10)
Accepted Answers:
Doubled
ELFN works based on __________________the network (Choose most appropriate)
Selecting
Probing
Distributing
None of these
Score: 0
Accepted Answers:
Probing
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Unit 5 - Week 4
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Week 1:
Week 2
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Week 5
Week 6
Week 7
Week 8
Lecture 16:
Opportunistic
Mobile
Networks- Part-
II
Lecture 17:
Opportunistic
Mobile
Networks- Part-
III
Lecture 18: UAV
Networks- Part-
I
Lecture 19: UAV
Networks- Part-
II
Lecture 20: UAV
Networks- Part-
III
Week 4: Lecture
Material
Quiz :
Assignment
Week 4
Assignment
Solution Week 4
Due on 2018-03-07, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 4
UAV-SDN aims to achieve –
Autonomous UAV control
Remote UAV control
Remote control and configuration of network of UAVs
Swarm of UAVs
Score: 0
Accepted Answers:
Remote control and configuration of network of UAVs
What does the presence function in a time-varying graph indicate?
Whether or not a given node was present at a given location at a given time instant
Whether or not it belongs to the cut set
Characterizes a node via which all communication must pass
Whether or not a given edge was present at a given time instant
Score: 0
Accepted Answers:
Whether or not a given edge was present at a given time instant
What does a Protocol Translation Unit do?
Allows two different routing protocols to communicate
Allows devices with heterogeneous MAC layers to communicate
Provides backward compatibility to older versions of a given protocol
Collects messages from highly mobile nodes similar to throwboxes
Score: 0
Accepted Answers:
Allows two different routing protocols to communicate
Which is not a typical requirement for reputation/trust management schemes for OMNs, in
general?
Tamper-proof hardware
Huge network bandwidth
Use of cryptographic hashes
Presence of certifying authorities

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Huge network bandwidth
OMNs are very similar to MANETs in the sense that they both lack in network infrastructure.
However, their primary difference is the lack of ____
End-to-end communication
Storage
Processing power
All of these
Score: 0
Accepted Answers:
End-to-end communication
Multi-UAV systems have preferably ____________ antennas, whereas single UAV systems
have omni-directional antennas.
Omni-directional
Bi-directional
Directional
None of these
Score: 0
Accepted Answers:
Directional
Similar to vehicular networks, which are termed VANETs, UAV networks are popularly termed
as:
UANETs
FANETs
WINETs
All of these
Score: 0
Accepted Answers:
FANETs
Yaw, Pitch and Roll values are determined from which sensor?
Accelerometer
Gyroscope
Magnetometer
Barometer
Score: 0
Accepted Answers:
Gyroscope
An UAV SDN implementation encompasses data and ________ planes of communication.
Process
Resource
Control
Display
Score: 0

1 point
10)
Accepted Answers:
Control
In ProPHET, the use of ___ allows to update the contact probability with a node with whom
there has been no contact lately
Paging
Aging
Indexing
Casing
Score: 0
Accepted Answers:
Aging
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Unit 6 - Week 5
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Week 1:
Week 2
Week 3
Week 4
Week 5
Lecture 21:
Introducation:
Wireless Sensor
Networks- Part-
I
Lecture 22:
Introducation:
Wireless Sensor
Networks- Part-
II
Lecture 23:
WSN Coverage
& Placement-
Part-I
Lecture 24:
WSN Coverage
& Placement-
Part-II
Lecture 25:
Topology
Mangement in
Wireless Sensor
Networks
Week 5 Lecture
Material
Feedback for
week 5
Quiz :
Assignment
Week 5
Assignment
Solution Week 5
Due on 2018-03-14, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 5
Solution for optimal coverage includes the important parameters as:
Coverage requirement
Detection time
Number of sensors
All of the above
Score: 0
Accepted Answers:
All of the above
Typically, ratio between transmission range and sensing range is:
2:1
1:1
1:2
None of the above
Score: 0
Accepted Answers:
2:1
Adequate placement of sensor node is important to ensure
Adequate power consumption
Adequate transmission
Adequate coverage
None of these
Score: 0
Accepted Answers:
Adequate coverage
An example of coverage algorithm is
CoRD
OGDC
OMN
All of these

Week 6
Week 7
Week 8
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5)
1 point
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1 point
7)
1 point
8)
1 point
9)
Score: 0
Accepted Answers:
OGDC
Which of the following algorithms is known for establishing the connectivity in the presence of
dumb nodes?
INTSEM
CoRD
OGDC
None of the above
Score: 0
Accepted Answers:
CoRD
Which statement is false in context of the LEACH protocol?
In the setup phase, clusters are created and cluster heads are determined
The nodes join the cluster nearest to them with the strongest signal
In the steady state phase, CSMA-based solutions are used for inter-cluster communication
In the steady state phase, TDMA-based solutions are used for inter-cluster communication
Score: 0
Accepted Answers:
Which statement is false with respect to the EMACs protocol?
EMACs is a fully centralized algorithm
The active nodes periodically transmit short control messages
The dormant nodes are the nodes which run critically low in energy
None of the above
Score: 0
Accepted Answers:
EMACs is a fully centralized algorithm
K-barrier coverage requires a barrier to be covered by:
At least k sensors
At least 1 sensors
At least 2 sensors
At least 3 sensors
Score: 0
Accepted Answers:
At least k sensors
Which statement is true with respect to the LMAC protocol?
The control messages transmitted are of fixed length
LMAC ensures collision-free communication
A node may transmit either a control message or a data frame during any time slot
All of the above
Score: 0
Accepted Answers:
All of the above

1 point
10)
Which is not a variant of S-MAC?
Timeout MAC (TMAC)
Dynamic sensor MAC (DSMAC)
Input-Output MAC (IOMAC)
Data gathering (DMAC)
Score: 0
Accepted Answers:
Input-Output MAC (IOMAC)
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Unit 7 - Week 6
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Week 1:
Week 2
Week 3
Week 4
Week 5
Week 6
Lecture 26:
Mobile Wireless
Sensor
Networks
Lecture 27:
Medium Access
Control in
Wireless
Networks- Part-I
Lecture 28:
Medium Access
Control in
Wireless
Networks- Part-
II
Lecture 29:
Routing in
Wireless Sensor
Networks- Part-
I
Lecture 30:
Routing in
Wireless Sensor
Networks- Part-
II
Week 6: Lecture
Material
Feedback for
week 6
Quiz :
Assignment
Due on 2018-03-21, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 6
1. Which of the following statements does not describe the S-MAC protocol correctly?
Energy dissipation is reduced in S-MAC through idle listening
Implementation of the algorithm is simple
The sleep and listen vary constantly based on the network traffic conditions
All of the above
Score: 0
Accepted Answers:
The sleep and listen vary constantly based on the network traffic conditions
Which is not a protocol of SPIN family?
SPIN-PP
SPIN-PC
SPIN-EC
SPIN-BC
Score: 0
Accepted Answers:
SPIN-PC
The goal of participatory sensing is/are
Only collect data
Allow people to access data
Share knowledge
All of the above
Score: 0
Accepted Answers:
All of the above
Why is implementation of MAC protocols important in context of WSNs?
Supports multi-hop communication, alongside single-hop
Special design for energy-constrained environments
Support for Ad-hoc node deployment
All of the above

Week 7
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Assignment
Solution Week 6
1 point
5)
1 point
6)
1 point
7)
1 point
8)
1 point
9)
Score: 0
Accepted Answers:
All of the above
Which is not a cause for undesired energy wastage in WSNs?
Sensing of events
Idle listening
Overhearing in case of densely deployed sensor networks
Collision of transmitted frames
Score: 0
Accepted Answers:
Sensing of events
Which of the following is the example of flat routing?
SPIN
CFFR
All of these
None of these
Score: 0
Accepted Answers:
SPIN
LEACH uses dynamic _______ cycles.
CDMA
FDMA
TDMA
OFDMA
Score: 0
Accepted Answers:
TDMA
Which is a negotiation based routing scheme?
Directed Diffusion
SPIN
SPEED
TTDD
Score: 0
Accepted Answers:
SPIN
What is the difference between the 3-color and 4-color topdisc mechanisms? a. 4-color
topdisc mechanism does not have a cluster head node b. Unlike the 3-color topdisc, nodes may have
red or blue color in 4-color topdisc mechanism c. Grey color is not present in 3-color topdisc mechanism
d. Dark grey color is not present in 3-color topdisc mechanism
4-color topdisc mechanism does not have a cluster head node
Unlike the 3-color topdisc, nodes may have red or blue color in 4-color topdisc mechanism
Grey color is not present in 3-color topdisc mechanism
Dark grey color is not present in 3-color topdisc mechanism
Score: 0

1 point
10)
Accepted Answers:
Dark grey color is not present in 3-color topdisc mechanism
Which statement is false in context of the LEACH protocol?
In the setup phase, clusters are created and cluster heads are determined
The nodes join the cluster nearest to them with the strongest signal
In the steady state phase, TDMA-based solutions are used for inter-cluster communication
Score: 0
Accepted Answers:
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Unit 8 - Week 7
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Week 1:
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Lecture 31:
Congestion and
Flow Control-
Part- I
Lecture 32:
Congestion and
Flow Control-
Part- II
Lecture 33:
Underwater
Sensor
Networks- Part-
I
Lecture 34:
Underwater
Sensor
Networks- Part-
II
Lecture 35:
Underwater
Sensor
Networks- Part-
III
Week 7: Lecture
Material
Feedback for
week 7
Quiz :
Assignment
Due on 2018-03-28, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 7
In Congestion Control, a bit can be set in a packet moving in the direction opposite to
congestion in
Implicit Signaling
Backward Signaling
Source Signaling
Data Signaling
Score: 0
Accepted Answers:
Backward Signaling
There is no communication between congested node or nodes and source in the
Implicit Signaling
IP Signaling
Source Signaling
Data Signaling
Score: 0
Accepted Answers:
Implicit Signaling
In Congestion, formula to calculate Average Data Rate (ADR) is
Amount of Data/Stream
Amount of Data/Protocol
Amount of Data/Time
Packet
Score: 0
Accepted Answers:
Amount of Data/Time
In Congestion Control and Quality of Services, our main focus is on
Data Protocol
Data Layer
Data Congestion
Data Traffic

Week 8
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Week 7
Assignment
Solution Week 7
1 point
5)
1 point
6)
1 point
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1 point
8)
1 point
9)
Score: 0
Accepted Answers:
Data Traffic
________________ is the best suitable ranging technique among these? (Consider no time-
synchronization among nodes.)
ToA (one-way message transfer)
Euclidean distance propagation technique
ToA (two-way message transfer)
All of the above
Score: 0
Accepted Answers:
ToA (two-way message transfer)
For achieving network-wide localization, which are the important parameters for evaluating
any localization algorithm?
Localization coverage
Average localization accuracy
Average energy consumption
All of these
Score: 0
Accepted Answers:
All of these
Underwater mobility affects
Topology
Link between nodes
Coverage
All of these
Score: 0
Accepted Answers:
All of these
Which statement is true for UWSN
High spatio-temporal variability of communication channel
Less transmission power required
No memory required for data caching
None of these
Score: 0
Accepted Answers:
High spatio-temporal variability of communication channel
The UWSN network could be
Star topology
Cluster topology
Mesh topology
All of these
Score: 0
Accepted Answers:

1 point
10)
All of these
No. of reference points required for localizing a node in 3D coordinate systems is ______.
4
3
5
None of these
Score: 0
Accepted Answers:
4
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Unit 9 - Week 8
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Week 1:
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Lecture 36:
Underwater
Sensor
Networks- Part-
IV
Lecture 37:
Security of
Wireless Sensor
Networks- Part-
I
Lecture 38:
Security of
Wireless Sensor
Networks- Part-
II
Lecture 39:
Hardware
Design of
Sensor Node
Lecture 40:
Real Life
Deployment of
WSN
Week 8: Lecture
Material
Feedback for
week 8
Due on 2018-04-04, 23:59 IST.
1 point
1)
1 point
2)
1 point
3)
1 point
4)
Assignment Week 8
Which of the following jamming attacks is time specific?
Constant jamming
Intermittent jamming
Deceptive jamming
Reactive jamming
Score: 0
Accepted Answers:
Intermittent jamming
The primary challenges of embedded operating system are
Small memory footprint
Efficient in power and computation
Lack hardware parallelism
All of these
Score: 0
Accepted Answers:
All of these
Advantages of Event-Driven Model operating system in WSN are
Concurrency with low resources
Complements the way networking protocols work
Inexpensive scheduling technique
All of these
Score: 0
Accepted Answers:
All of these
Example of Event-Driven Model operating system (OS) in WSN is
Mantis OS
RETOS
TinyOS
None of these

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Solution Week 8
1 point
5)
1 point
6)
1 point
7)
1 point
8)
1 point
9)
Score: 0
Accepted Answers:
TinyOS
A Bluetooth network consists of one primary device(s) and up to ____ secondary devices.
Five
Two
Seven
Nine
Score: 0
Accepted Answers:
Seven
Radar is one kind of ________ sensor
Passive
Active
Dead
None of these
Score: 0
Accepted Answers:
Active
One malicious node behaves like multiple nodes, this type of attack is known as
Byzantine attack
Sybil attack
DoS attack
Spoofing
Score: 0
Accepted Answers:
Sybil attack
The flash memory of microcontroller in a sensor node is used to
Hold a data base
Hold a data sheet only
Hold a program code
Hold program variables only
Score: 0
Accepted Answers:
Hold a program code
An example of Selective forwarding attack is:
Forwarding attack
Sinkhole attack
Selectivity attack
None of these
Score: 0
Accepted Answers:
Sinkhole attack

1 point
10)
Traditional cryptographic algorithms cannot be used directly in WSN, because sensor nodes
are
Resource constrained.
Memory-less
Clock-less
Processor-less
Score: 0
Accepted Answers:
Resource constrained.
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