Wireless Sensor Networks Wsn Set 9
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This set of Wireless Sensor Networks (WSN) Multiple Choice Questions & Answers (MCQs) focuses on Wireless Sensor Networks Wsn Set 9
Q1 | An inherent problems with S-MAC is
- it does not allow sensor nodes to sleep for extensive amounts of time.
- internal clocks are not present.
- the internal clock of the nodes are not synchronized.
- the internal clock of the nodes are synchronized.
Q2 | Timeout-MAC (T-MAC) letting the nodes timeout when nothing happens
- during their sleep periods.
- during their active periods.
- before the active period.
- after the active period.
Q3 | Berkeley MAC (B-MAC) was developed to tackle the problems of
- t-mac
- s-mac
- lpl
- all of above
Q4 | Long preamble used in Berkeley MAC (B-MAC) has long preamble consist of
- application data
- other payloads
- has fixed length and may carry sender, receiver, and packet size information
- has variable length and may carry sender, receiver, and packet size information
Q5 | Long preamble used in Berkeley MAC (B-MAC) has to be send at least for duration of
- wakeup time
- less than wakeup time
- sleeping time
- less than sleeping time
Q6 | The MAC protocol,
- guarantee that the transmission will be successful
- does not guarantee that the transmission will be successful
- guarantee that the retransmission will be successful
- none of above
Q7 | incorrect statement is
- the lower the received signal strength indicator -rssi, better the signal.
- link quality indicator (lqi) positive number ranging from approximately 110 to 50
- link quality indicator (lqi) positive number ranging from approximately 0 to 100
- packet reception ratio measured in fraction
Q8 | The packet reception ratio (PPR) is depicted against the distance
- at long distance between nodes, the prr increases
- at short distance between nodes, the prr decreases
- at long distance between nodes, the prr decreases
- ppr is independent of distance between nodes
Q9 | In the clear communication zone communication is
- at least a 90%
- almost impossible, but interference might still occur.
- interference free.
- from almost 100% to 0%
Q10 | The purpose of error control is to
- guarantee communication is error-free & in-sequence,
- guarantee communication is duplicate-free, and loss-free
- guarantee communication is error-free and loss-free
- a and b both
Q11 | Backward Error Control –
- should not try to prevent errors but only discover errors.
- should try to prevent errors
- should try to prevent errors and avoid discovery of errors
- none of the above
Q12 | Forward Error Control-
- should not try to prevent errors but only discover errors.
- should try to prevent errors only
- should try to prevent errors and avoid discovery of errors
- attempts to prevent errors instead of only detecting them
Q13 | Select correct statement for naming
- name reveal a about the position of the node and its role.
- name reveal about the position of the node, but not about the role.
- name does not reveal anything about the position of the node. reveal something about the role.
- name does not reveal anything about the position of the node as well as its role.
Q14 | Select correct statement for addressing of node
- address reveal a about the position of the node and its role.
- address reveal about the position of the node, but not about the role.
- address does not reveal anything about the position of the node. reveal something about the role.
- address does not reveal anything about the position of the node as well as its role.
Q15 | Centralized Topology Control
- is very hard to perform
- requires significant communication overhead
- react well in case of changes.
- all are leading nodes
Q16 | Distributed Topology Control
- is very simple to perform
- requires less time to stabilize
- more flexible, situation-aware
- less precise than centralized control.
Q17 | What is shadowing?
- direct signal
- undirect signal
- signal strength
- signal range
Q18 | In wireless distribution system
- there is no access point
- there is no repeater in wireless network
- multiple aps are inter-connected with each other
- none of the above
Q19 | What device is the wireless equivalent of a wired hub?
- bridge
- repeater
- antenna
- access-point
Q20 | The type of access used in GSM technology is
- tdma
- cdma
- ofdma
- none of the above
Q21 | 34. Uplinks are also knowns as
- reverse link
- bs link
- forward link
- ms link
Q22 | A one-to-all communication between one source and all hosts on a network is classified as a _______ communication.
- unicast
- multicast
- broadcast
- none of the above
Q23 | A one-to-many communication between one source and a specific group of hosts is classified as a _______ communication.
- unicast
- multicast
- broadcast
- none of the above
Q24 | A one-to-one communication between one source and one destination is classified as a _______ communication.
- unicast
- multicast
- broadcast
- none of the above