Wireless Sensor Networks Wsn Set 5 MCQs

Q1 | Similarities between WSNs and MANETs networks is.

nodes are densely deployed

the nodes communicate each other using multi-hop communication

topology changes very frequently

have global unique identification for nodes

Q2 | In which network access point is not required?

ad hoc network

infrastructure network

both a and b

none of the above

Q3 | As the number of nodes___________, every node spends almost all of its time forwarding packets of other nodes

decreases

increases

constant

none of the above

Q4 | In wireless sensor networks, some of the information defining the objective function and constraints is available only at___________

compile time

run time

ideal time

setup time

Q5 | To ensure the ___________of the system, the communication and computation should be localized to relevant sensors only

responsiveness

scalability

both a and b

neither a nor b

Q6 | Networking allows geographical distribution of the sensor nodes and their placement close to signal sources

does not depend on signal source

statement is correct

irrelavant corelation

away from signal source

Q7 | Within the coverage range, communication is done by__________

multicast

broadcast

unicast

all of the above

Q8 | ___________sub-layer manages access to the physical network medium, and its fundamental goal is to reduce or avoid packet collisions in the medium

mac

llc

application

session

Q9 | Following characteristics of wireless sensor networks point to the need for a specialized MAC protocol

the issues of fairness of the node level are much less important than overall application performance

most sensor nodes are idle much of the time

in-network processing can greatly improve bandwidth utilization

all of above

Q10 | Following MAC protocols have been developed for wireless voice and data communication networks

tdma

fdma

cdma

all of above

Q11 | The main goal of the ___________is to reduce energy waste caused by idle listening, collisions, overhearing and control overhead

s-mac protocol

ieee802.15.4 standard

a and b

none of these

Q12 | The S-MAC protocol includes following major components

periodic listen and sleep

collision avoidance

overheating avoidance

all of above

Q13 | In the S-MAC protocol, ___________is designed to reduce energy consumption during the long idle time when no sensing events happen, by turning off the radio periodically

message passing

periodic listen and sleep

topology control

link control

Q14 | Examples of data attributes may include

node\s location

node\s type of sensors

certain range of values in a certain type of sensed data

all of above

Q15 | It may be more economical to use a smaller transmission radius for nodes in areas of high node density, w/o sacrificing adequate network connectivity. This is the issue of___________

topology control

traffic control

protocol control

link control

Q16 | This describes how the Ethernet protocol regulates communication among connection points.

carrier sense multiple access/collision detect

discontinuous transmission

aggregator

wait and response

Q17 | 802.11 wireless networking uses what method as the media access method?

csma/cd

cts/rts

csma/ca

cscd/ca

Q18 | ____________ assigns a unique number to each IP network adapter called the MAC address.

media access control

metro access control

metropolitan access control

both b and c above

Q19 | In ________ each station sends a frame whenever it has a frame to send.

pure aloha

slotted aloha

both (a) and (b)

neither (a) nor (b)

Q20 | In pure ALOHA, the vulnerable time is ______ the frame transmission time.

the same as

two times

three times

none of the above

Q21 | In __________, each station is forced to send only at the beginning of the time slot.

pure aloha

slotted aloha

both (a) and (b)

neither (a) nor (b)