McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electronics and Telecommunication Engineering [ENTC] .
| 201. |
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» C. the internal clock of the nodes are not synchronized. | |
| 202. |
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» B. during their active periods. | |
| 203. |
Berkeley MAC (B-MAC) was developed to tackle the problems of |
| A. | t-mac |
| B. | s-mac |
| C. | lpl |
| D. | all of above |
| Answer» B. s-mac | |
| 204. |
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 |
| Answer» D. has variable length and may carry sender, receiver, and packet size information | |
| 205. |
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 |
| Answer» C. sleeping time | |
| 206. |
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 |
| Answer» B. does not guarantee that the transmission will be successful | |
| 207. |
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 |
| Answer» B. link quality indicator (lqi) positive number ranging from approximately 110 to 50 | |
| 208. |
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 |
| Answer» C. at long distance between nodes, the prr decreases | |
| 209. |
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% |
| Answer» B. almost impossible, but interference might still occur. | |
| 210. |
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 |
| Answer» D. a and b both | |
| 211. |
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 |
| Answer» A. should not try to prevent errors but only discover errors. | |
| 212. |
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 |
| Answer» D. attempts to prevent errors instead of only detecting them | |
| 213. |
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. |
| Answer» C. name does not reveal anything about the position of the node. reveal something about the role. | |
| 214. |
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. |
| Answer» B. address reveal about the position of the node, but not about the role. | |
| 215. |
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 |
| Answer» B. requires significant communication overhead | |
| 216. |
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. |
| Answer» C. more flexible, situation-aware | |
| 217. |
What is shadowing? |
| A. | direct signal |
| B. | undirect signal |
| C. | signal strength |
| D. | signal range |
| Answer» B. undirect signal | |
| 218. |
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 |
| Answer» C. multiple aps are inter-connected with each other | |
| 219. |
What device is the wireless equivalent of a wired hub? |
| A. | bridge |
| B. | repeater |
| C. | antenna |
| D. | access-point |
| Answer» D. access-point | |
| 220. |
The type of access used in GSM technology is |
| A. | tdma |
| B. | cdma |
| C. | ofdma |
| D. | none of the above |
| Answer» A. tdma | |
| 221. |
Uplinks are also knowns as |
| A. | reverse link |
| B. | bs link |
| C. | forward link |
| D. | ms link |
| Answer» A. reverse link | |
| 222. |
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 |
| Answer» A. can; cannot | |
| 223. |
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 |
| Answer» C. broadcast | |
| 224. |
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 |
| Answer» B. multicast | |
| 225. |
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 |
| Answer» A. unicast | |
| 226. |
While defining a unifying architecture for sensor networks is still an open problem, a key element of such an architecture is the principled interaction between the______ &_____layers |
| A. | application /network |
| B. | application/transport |
| C. | transport/network |
| D. | transport/ application |
| Answer» A. application /network | |
| 227. |
___________defines both the physical and MAC layer protocols for most remote monitoring and control as well as sensor network applications |
| A. | s-mac protocol |
| B. | ieee802.15.4 standard |
| C. | wifi |
| D. | bluetooth |
| Answer» B. ieee802.15.4 standard | |
| 228. |
___________is an industry consortium with the goal of promoting the IEEE802.15.4 standard |
| A. | bluetooth |
| B. | zigbee |
| C. | wifi |
| D. | nfc |
| Answer» B. zigbee | |
| 229. |
Following are features of ZigBee |
| A. | it is an industry consortium with the goal of promoting the ieee802.15.4 standard |
| B. | it ensures interoperability by defining higher network layers and application interfaces |
| C. | it is optimized for low data throughput up to 115.2 kbps, with simple or no qos support |
| D. | all of above |
| Answer» D. all of above | |
| 230. |
What networking structure do the 802.11 standards define? |
| A. | wlan |
| B. | bbs |
| C. | wpan |
| D. | wman |
| Answer» A. wlan | |
| 231. |
Which one of the IEEE 802 committees is tasked with the development of security standards? |
| A. | 802.1 |
| B. | 802.16 |
| C. | 802.15 |
| D. | 802.11 |
| Answer» A. 802.1 | |
| 232. |
Specifications for a wireless LAN are called |
| A. | standard 802.3z. |
| B. | standard 802.3u. |
| C. | project 802.3. |
| D. | ieee 802.11. |
| Answer» D. ieee 802.11. | |
| 233. |
What industry association develops, publishes, and maintains the standards for wireless networks? |
| A. | ieee |
| B. | ism |
| C. | unii |
| D. | fcc |
| Answer» A. ieee | |
| 234. |
What term is used to represent the physical layer of an 802.11x standard? |
| A. | pyc |
| B. | phy |
| C. | bss |
| D. | wlan |
| Answer» B. phy | |
| 235. |
What is the term used to represent the IEEE 802.11 layer that controls access to the medium? |
| A. | wlan |
| B. | phy |
| C. | mac |
| D. | bss |
| Answer» C. mac | |
| 236. |
What is the RF communications standard that can organize up to 8 devices into a piconet? |
| A. | bluetooth |
| B. | uwb |
| C. | zigbee |
| D. | irda |
| Answer» A. bluetooth | |
| 237. |
Which of the IEEE 802 standards defines the technologies used to form and manage personal area networks? |
| A. | 802.16 |
| B. | 802.11 |
| C. | 802.3 |
| D. | 802.15 |
| Answer» D. 802.15 | |
| 238. |
Which of the following is Bluetooth's Physical layer? |
| A. | ultra wideband |
| B. | baseband |
| C. | broadband |
| D. | wideband |
| Answer» B. baseband | |
| 239. |
The use of Ultra wideband (UWB) technology for WPANs is specified under the __________ standards. |
| A. | 802.15.1 |
| B. | 802.15.4 |
| C. | 802.15.3 |
| D. | 802.15.2 |
| Answer» C. 802.15.3 | |
| 240. |
___________is an industry consortium with the goal of promoting the IEEE802.15.4 standard |
| A. | bluetooth |
| B. | zigbee |
| C. | both |
| D. | none of above |
| Answer» B. zigbee | |
| 241. |
___________defines both the physical and MAC layer protocols for most remote monitoring and control as well as sensor network applications |
| A. | s-mac protocol |
| B. | b-mac protocol |
| C. | ieee802.15.4 standard |
| D. | none of above |
| Answer» C. ieee802.15.4 standard | |
| 242. |
Following is/are features of ZigBee |
| A. | it is an industry consortium with the goal of promoting the ieee802.15.4 standard |
| B. | it ensures interoperability by defining higher network layers and application interfaces |
| C. | it is optimized for low data throughput up to 115.2 kbps, with simple or no qos support |
| D. | all of above |
| Answer» D. all of above | |
| 243. |
Unlike_____, ______achieves its power efficiency from both the physical and MAC layers |
| A. | ieee802.15.4 standard , smac protocol |
| B. | smac protocol , ieee802.15.4 standard |
| C. | ieee802.15.4 standard , bmac protocol |
| D. | none of above |
| Answer» B. smac protocol , ieee802.15.4 standard | |
| 244. |
Protocol used for low data rate WPAN is |
| A. | ieee 802.15.1 standard |
| B. | ieee 802.15.2 standard |
| C. | ieee 802.15.3 standard |
| D. | ieee 802.15.4 standard |
| Answer» D. ieee 802.15.4 standard | |
| 245. |
Protocol used for high data rate WPAN is |
| A. | ieee 802.15.1 standard |
| B. | ieee 802.15.2 standard |
| C. | ieee 802.15.3 standard |
| D. | ieee 802.15.4 standard |
| Answer» C. ieee 802.15.3 standard | |
| 246. |
IEEE 802.15.4 standard has data rate of |
| A. | 20 kb/s, 40kb/s, 250kb/s |
| B. | 20 kb/s, 40kb/s, 80kb/s |
| C. | 20 kb/s, 80kb/s, 200kbs |
| D. | 40 kb/s, 80kb/s, 160kbs |
| Answer» A. 20 kb/s, 40kb/s, 250kb/s | |
| 247. |
IEEE 802.15.4 standard has ______ channels are in the 915MHz ISM band. |
| A. | 1 |
| B. | 10 |
| C. | 16 |
| D. | 24 |
| Answer» B. 10 | |
| 248. |
IEEE 802.15.4 standard has ______ channels are in the 2.4GHz ISM band. |
| A. | 8 |
| B. | 12 |
| C. | 16 |
| D. | 32 |
| Answer» C. 16 | |
| 249. |
IEEE 802.15.4 standard has ______ channels are in European 868MHz band. |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» A. 1 | |
| 250. |
Which of the following is not the job of IEEE 802.15.4 PHY standard |
| A. | packet generation |
| B. | packet reception |
| C. | channel acquisition |
| D. | power management |
| Answer» C. channel acquisition | |
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