Deck 9: Wireless Mac Protocols and Network Topology Control

Question 1

An inherent problems with S-MAC is

A)it does not allow sensor nodes to sleep for extensive amounts of time.
B)internal clocks are not present.
C)the internal clock of the nodes are not synchronized.
D)the internal clock of the nodes are synchronized.

Answer 1

the internal clock of the nodes are not synchronized.

Question 2

Timeout-MAC (T-MAC) letting the nodes timeout when nothing happens

A)during their sleep periods.
B)during their active periods.
C)before the active period.
D)after the active period.

Answer 2

during their active periods.

Question 3

Berkeley MAC (B-MAC) was developed to tackle the problems of

A)t-mac
B)s-mac
C)lpl
D)all of above

Answer 3

s-mac

Question 4

Long preamble used in Berkeley MAC (B-MAC) has long preamble consist of

A)application data
B)other payloads
C)has fixed length and may carry sender, receiver, and packet size information
D)has variable length and may carry sender, receiver, and packet size information

Question 5

Long preamble used in Berkeley MAC (B-MAC) has to be send at least for duration of

A)wakeup time
B)less than wakeup time
C)sleeping time
D)less than sleeping time

Question 6

The MAC protocol,

A)guarantee that the transmission will be successful
B)does not guarantee that the transmission will be successful
C)guarantee that the retransmission will be successful
D)none of above

Question 7

incorrect statement is

A)the lower the received signal strength indicator -rssi, better the signal.
B)link quality indicator (lqi) positive number ranging from approximately 110 to 50
C)link quality indicator (lqi) positive number ranging from approximately 0 to 100
D)packet reception ratio measured in fraction

Question 8

The packet reception ratio (PPR) is depicted against the distance

A)at long distance between nodes, the prr increases
B)at short distance between nodes, the prr decreases
C)at long distance between nodes, the prr decreases
D)ppr is independent of distance between nodes

Question 9

In the clear communication zone communication is

A)at least a 90%
B)almost impossible, but interference might still occur.
C)interference free.
D)from almost 100% to 0%

Question 10

The purpose of error control is to

A)guarantee communication is error-free & in-sequence,
B)guarantee communication is duplicate-free, and loss-free
C)guarantee communication is error-free and loss-free
D)a and b both

Question 11

Backward Error Control -

A)should not try to prevent errors but only discover errors.
B)should try to prevent errors
C)should try to prevent errors and avoid discovery of errors
D)none of the above

Question 12

Forward Error Control-

A)should not try to prevent errors but only discover errors.
B)should try to prevent errors only
C)should try to prevent errors and avoid discovery of errors
D)attempts to prevent errors instead of only detecting them

Question 13

Select correct statement for naming

A)name reveal a about the position of the node and its role.
B)name reveal about the position of the node, but not about the role.
C)name does not reveal anything about the position of the node.reveal something about the role.
D)name does not reveal anything about the position of the node as well as its role.

Question 14

Select correct statement for addressing of node

A)address reveal a about the position of the node and its role.
B)address reveal about the position of the node, but not about the role.
C)address does not reveal anything about the position of the node.reveal something about the role.
D)address does not reveal anything about the position of the node as well as its role.

Question 15

Centralized Topology Control

A)is very hard to perform
B)requires significant communication overhead
C)react well in case of changes.
D)all are leading nodes

Question 16

Distributed Topology Control

A)is very simple to perform
B)requires less time to stabilize
C)more flexible, situation-aware
D)less precise than centralized control.

Question 17

What is shadowing?

A)direct signal
B)undirect signal
C)signal strength
D)signal range

Question 18

In wireless distribution system

A)there is no access point
B)there is no repeater in wireless network
C)multiple aps are inter-connected with each other
D)none of the above

Question 19

What device is the wireless equivalent of a wired hub?

A)bridge
B)repeater
C)antenna
D)access-point

Question 20

The type of access used in GSM technology is

A)tdma
B)cdma
C)ofdma
D)none of the above

Question 21

Uplinks are also knowns as

A)reverse link
B)bs link
C)forward link
D)ms link

Question 22

The RTS and CTS frames in CSMA/CA ____ solve the hidden station problem. The RTS and CTS frames in CSMA/CA ____ solve the exposed station problem.

A)can; cannot
B)cannot; can
C)can; can
D)cannot; cannot

Question 23

A one-to-all communication between one source and all hosts on a network is classified as a _______ communication.

A)unicast
B)multicast
C)broadcast
D)none of the above

Question 24

A one-to-many communication between one source and a specific group of hosts is classified as a _______ communication.

A)unicast
B)multicast
C)broadcast
D)none of the above

Question 25

A one-to-one communication between one source and one destination is classified as a _______ communication.

A)unicast
B)multicast
C)broadcast
D)none of the above