Deck 5: Topics on Wireless Sensor Networks and Network Access Protocols

Question 1

Similarities between WSNs and MANETs networks is.

A)nodes are densely deployed
B)the nodes communicate each other using multi-hop communication
C)topology changes very frequently
D)have global unique identification for nodes

Answer 1

the nodes communicate each other using multi-hop communication

Question 2

In which network access point is not required?

A)ad hoc network
B)infrastructure network
C)both a and b
D)none of the above

Answer 2

ad hoc network

Question 3

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

A)decreases
B)increases
C)constant
D)none of the above

Answer 3

increases

Question 4

A central problem for WSN is to dynamically define and form sensor groups based on__________

A)task requirements
B)resource availability
C)both a and b
D)none of these

Question 5

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

A)compile time
B)run time
C)ideal time
D)setup time

Question 6

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

A)responsiveness
B)scalability
C)both a and b
D)neither a nor b

Question 7

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

A)does not depend on signal source
B)statement is correct
C)irrelavant corelation
D)away from signal source

Question 8

Within the coverage range, communication is done by__________

A)multicast
B)broadcast
C)unicast
D)all of the above

Question 9

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

A)mac
B)llc
C)application
D)session

Question 10

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

A)the issues of fairness of the node level are much less important than overall application performance
B)most sensor nodes are idle much of the time
C)in-network processing can greatly improve bandwidth utilization
D)all of above

Question 11

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

A)tdma
B)fdma
C)cdma
D)all of above

Question 12

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)a and b
D)none of these

Question 13

The S-MAC protocol includes following major components

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

Question 14

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

A)message passing
B)periodic listen and sleep
C)topology control
D)link control

Question 15

Examples of data attributes may include

A)node\s location
B)node\s type of sensors
C)certain range of values in a certain type of sensed data
D)all of above

Question 16

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___________

A)topology control
B)traffic control
C)protocol control
D)link control

Question 17

Which multiple access technique is used by iEEE 802.11 standard for wireless LAN?

A)cdma
B)cdma/cd
C)cdma/ca
D)none of the above

Question 18

This is what happens if two devices on the same Ethernet network determine the network is free, but attempt to transmit data at exactly the same time.

A)overlap
B)crossover
C)collision
D)none of the above

Question 19

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

A)carrier sense multiple access/collision detect
B)discontinuous transmission
C)aggregator
D)wait and response

Question 20

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

A)csma/cd
B)cts/rts
C)csma/ca
D)cscd/ca

Question 21

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

A)media access control
B)metro access control
C)metropolitan access control
D)both b and c above

Question 22

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

A)pure aloha
B)slotted aloha
C)both (a) and (b)
D)neither (a) nor (b)

Question 23

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

A)the same as
B)two times
C)three times
D)none of the above

Question 24

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

A)pure aloha
B)slotted aloha
C)both (a) and (b)
D)neither (a) nor (b)