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Quiz Bluetooth IoT

Description

based on two bluetooth/ioT PDF:s
Jason Burger
Quiz by Jason Burger, updated more than 1 year ago
Jason Burger
Created by Jason Burger about 2 years ago
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Resource summary

Question 1

Question
What is the range estimator demo?
Answer
  • A demo that shows how to estimate the range of a Bluetooth device
  • A demo that shows how to estimate the battery life of a Bluetooth device
  • A demo that shows how to estimate the data transfer speed of a Bluetooth device
  • A demo that shows how to estimate the signal strength of a Bluetooth device

Question 2

Question
What is a mesh network?
Answer
  • A style of computer networking where all network devices are connected directly to every other device.
  • A network design where all computers are connected in a circular fashion, with the last device connecting back to the first.
  • A type of network where all devices connect to a central hub or switch.
  • A network design where only one computer is connected to the internet and all other devices must go through it.

Question 3

Question
What is BLE?
Answer
  • Basic Language Extension
  • Binary Logic Encoding
  • Bluetooth Low Energy
  • Baseband Link Encryption

Question 4

Question
What is the maximum range of traditional/classic Bluetooth technology?
Answer
  • 10 meters
  • 50 meters
  • 100 meters
  • 500 meters

Question 5

Question
What is true about lossless compression?
Answer
  • Removing unnecessary or less important information
  • Huffman Encoding
  • Arithmetic encoding
  • LC3 codec for BLE 5.2
  • Zip files
  • Mp3 for audio files

Question 6

Question
Which 3 steps are part of Low Energy Bluetooth connection setup?
Answer
  • Device discovery
  • Slave sends the address to the master
  • Master connects to the slave
  • Data exchange

Question 7

Question
Mesh Networking Advantages
Answer
  • Mesh networks are less scalable than point-to-point networks.
  • Multiple paths to destination – greater flexibility against interference.
  • Allows overall network to grow to larger physical sizes than possible with point-to-point networks.
  • In a mesh network, each device can only connnect to one other device, limiting flexibility and resilience
  • Allows devices to communicate to multiple other devices in the network

Question 8

Question
Mesh characteristics
Answer
  • Self forming
  • Self-healing
  • Self-destructive
  • Self-broadcastive
  • Tjena allt bra eller?

Question 9

Question
What is true about bluetooth?
Answer
  • It is a wireless technology standard for exchanging data over short distances from fixed or mobile devices
  • It is Developed and managed by Bluetooth Special Interest Group (SIG)
  • It is Named after Harald Blåtand
  • It operates in the free 2.4 GHz band, with around 80 MHz bandwidth
  • Bluetooth technology was developed and is managed by the Wi-Fi Alliance.
  • Adaptive Frequency Hopping for robustness (Eighty 1MHz channels)
  • Bluetooth operates in the free 5 GHz band, similar to some Wi-Fi networks.
  • Bluetooth uses a static frequency for data transmission, rather than changing frequencies

Question 10

Question
What phrases is true about bluetooth low energy?
Answer
  • Simple and easy to use model, Small bursts of data (lower duty cycle), Impressive battery life
  • State of the Art encryption, Impressive battery life.
  • Unlimited number of slaves connected to a master, small bursts of data (lower duty cycle), requires constant recharging.
  • Unlimited number of masters, Unlimited number of slaves connected to a master, Able to discover thousands of devices in local area
  • Compatible with all major platforms (iOS, Android, Windows, Linux), Faster connection, Low cost.
  • Security including privacy/authentication/authorization

Question 11

Question
Which statement about IoT is true?
Answer
  • IoT refers to the capability of devices to communicate only over Bluetooth networks
  • IoT refers to the capability of devices to communicate with each other without any form of network
  • IoT refers to the capability of devices to communicate with each other
  • oT refers only to the capability of personal devices such as smartphones and tablets to communicate with each other over wireless networks

Question 12

Question
Which of the following wireless technologies are typically used for Internet of Things (IoT) communication? Select all that apply.
Answer
  • Bluetooth® Technology
  • Wi-Fi
  • IEEE 802.15.4-Based Technologies (Thread, Zigbee)
  • Infrared
  • Cellular Low-Power Wide Area Network Technologies (NB-IoT, LTE-M)
  • Non-Cellular Low-Power Wide Area Network (LP-WAN) Technologies (LoRaWAN, Sigfox)
  • Z-Wave

Question 13

Question
Half of these are true for Classic bluetooth (Basic rate/ Enhanced data rate) And half of these are true for Low Energy (LE) Which are true for Classic BT?
Answer
  • Continuous data streaming
  • 79 channels with 1 MHz spacing
  • Power consumption: 1
  • Power consumption: ~0.01x to 0.5x of reference (depending on use case)
  • Data rate: Basic Rate: 1 Mb/s (GFSK) Extended Data Rate: 2 Mb/s, 3 Mb/s (4-DPSK, 8 D-PSK)
  • Data rate: 125 Kb/s, 500 Kb/s, 1Mb/s or 2 Mb/s (Hamming codes or 4/8 DPSK)
  • Network topology: Point-to-Point (including piconet)
  • Network topology: Point-to-Point (including piconet) Broadcast Mesh
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