Deck 7: Wireless Networking and Radio Communication

Question 1

Since a wireless ad-hoc network is decentralized and its topology is dynamic, each of the wireless nodes must perform its own message __________.

A)forwarding
B)protocols
C)switching
D)range

Answer 1

forwarding

Question 2

What is the networking device used to forward packets on a packet-switching network?

A)hub
B)lan switch
C)nap
D)router

Answer 2

router

Question 3

What signal transmission method intersperses message segments from multiple sessions into a single medium?

A)dsss
B)multiplexing
C)modulation
D)fhss

Answer 3

multiplexing

Question 4

What is the term used to describe the height of a radio wave?

A)frequency
B)amplitude
C)wavelength
D)modulation

Question 5

Which of the RF multiplexing methods uses times slices to carry multiple data streams on a single carrier?

A)fdm
B)fm
C)tdm
D)am

Question 6

The general rule of __________ is the inverse-square law, which measures an electromagnetic wave's strength relative to the distance over which it is transmitted.

A)intensity
B)frequency
C)amplitude
D)propagation

Question 7

The __________ is designed to radiate the aura of the electromagnetic field created by the electric current.

A)intensity
B)antenna
C)radio
D)phase

Question 8

__________ communications mode means that it can both transmit and receive, but only one action at a time.

A)radio
B)multiplexing
C)full duplex
D)half duplex

Question 9

The radio communication spectrum is divided into bands based on ______.

A)frequency
B)cost and hardware
C)transmission media
D)amplitude

Question 10

Which of the following is a type of wireless network interference that can originate from a nearby radio wave transmitter?

A)snr
B)rfi
C)emi
D)crosstalk

Question 11

What type of interference is emitted by nearby electrical motors, appliances, or faulty connections?

A)snr
B)rfi
C)crosstalk
D)emi

Question 12

What is the receive signal strength indicator used to measure?

A)the ssid of the access point with the strongest signal.
B)the weakest signal on any channel within the range of an access point.
C)the strongest signal on a particular channel at a specific location.
D)the channel which the least signal to noise ratio.

Question 13

What is the measurement used to indicate the amount of interference to a particular location?

A)crosstalk
B)snr
C)rfi
D)emi

Question 14

Which of these is not true for Time-Division Duplex (TDD)?

A)tdd uses different time slots for transmission and reception paths
B)single radio frequency can be used
C)it increases the battery life of mobile phones
D)a duplexer is required

Question 15

Densor sensor field---------- the odds of detecting a signal source within the range

A)increases
B)decreases
C)not affect
D)independent of

Question 16

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

A)decreases
B)increases
C)goes down
D)remains same

Question 17

select the incorrect statement

A)networking allows geographical distribution of the sensor nodes and their placement close to signal sources
B)radio communication is the less expensive operation a node performs in terms of energy usage
C)sensor networks are typically deployed in an adhoc manner
D)wireless communication between nodes utilizes radio links

Question 18

select the incorrect statement

A)networking allows geographical distribution of the sensor nodes and their placement close to signal sources
B)radio communication is the most expensive operation a node performs in terms of energy usage
C)sensor networks are typically deployed in an adhoc manner
D)wireless communication between nodes utilizes optical link links

Question 19

select the incorrect statement

A)networking allows geographical distribution of the sensor nodes and their placement close to signal sources
B)radio communication is the most expensive operation a node performs in terms of energy usage
C)sensor networks are typically deployed in structured manner
D)wireless communication between nodes utilizes radio links

Question 20

Within the coverage range, nodes communication is by__________

A)multicast
B)broadcast
C)both
D)none of above

Question 21

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

A)llc
B)physical
C)mac
D)baseband

Question 22

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

A)most sensor nodes are idle much of the time
B)in-network processing can greatly improve bandwidth utilization
C)issues of energy efficiency, scalability and robustness remain paramount
D)all of above

Question 23

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

A)s-mac protocol
B)iEEE 802.15.4 standard
C)both
D)iEEE 802.15.3 standard

Question 24

The S-MAC protocol includes following major component

A)periodic listen and sleep
B)collision avoidance
C)message passing
D)all of above

Question 25

The S-MAC protocol includes following major component

A)periodic listen and sleep
B)message passing
C)a and b both
D)none of above