Question 1

At the lowest level of the Bluetooth protocol stack is the ______ layer.
A) RF
B) LMP
C) TCP/IP
D) IR

Accepted Answer

The RF (Radio Frequency) layer is the lowest level of the Bluetooth protocol stack, responsible for managing the radio frequency communication between Bluetooth devices. The LMP (Link Manager Protocol) layer is a higher level protocol that handles the management of the Bluetooth link, but is not the lowest level. TCP/IP (Transmission Control Protocol/Internet Protocol) is a protocol used for internet communication and is not directly related to Bluetooth. IR (Infrared) is a communication protocol that uses light waves and is not used in Bluetooth technology.

Question 2

What type of security is provided for in the ZigBee specification?
A) encryption
B) MIC
C) short-range communications
D) ACLs
E) All of the above

Accepted Answer

The ZigBee specification provides all of the security measures listed, including encryption, MIC (Message Integrity Check), short-range communications, and ACLs (Access Control Lists).

Question 3

Which of the following is not an example of a Bluetooth communication?
A) cellular phone to PDA
B) notebook computer to PDA
C) hard drive to memory
D) notebook computer to GPS

Accepted Answer

Bluetooth communication is used for wireless data exchange between devices like phones, PDAs, computers, and GPS units, but not for internal data transfer within a device like a hard drive to memory.

Question 4

The _________ period is when ZigBee devices have time reserved for priority transmissions.
A) contention access
B) guaranteed time slot
C) beacon
D) time synchronization

Accepted Answer

The guaranteed time slot (GTS) period is when ZigBee devices have time reserved for priority transmissions. The contention access period (CAP) is when ZigBee devices contend for access to the communication channel. The beacon period is when the coordinator device broadcasts beacon frames to synchronize with other devices in the network. Time synchronization refers to the process of synchronizing the clocks of different devices in the network.

Question 5

A Bluetooth channel consists of _____________.
A) a specific frequency channel
B) an IEEE 802.15.1 channel
C) a hopping sequence including up to 79 frequencies
D) a frequency range that the signal spreads across

Accepted Answer

A Bluetooth channel is defined by a hopping sequence that includes up to 79 frequencies. This means that Bluetooth devices rapidly change frequencies within a frequency range to avoid interference and ensure reliable connections. The specific frequency channel or range that the signal spreads across is not fixed and can vary depending on the hopping sequence. While Bluetooth is based on the IEEE 802.15.1 standard, this does not necessarily define the specific channel used.

Question 6

What is the maximum data-transmission rate for ZigBee?
A) 2 Mbps
B) 723.5 Kbps
C) 250 Kbps
D) 40 Kbps

Accepted Answer

The answer of What is the maximum data-transmission rate for...

Question 7

Which frequency band(s) can ZigBee networks utilize?
A) ISM
B) U-NII
C) 3.1 GHz
D) 60 GHz
E) All of the above

Accepted Answer

ZigBee networks can utilize the ISM (Industrial, Scientific, and Medical) frequency band, which includes 2.4 GHz and 900 MHz frequencies. These frequencies are unlicensed and widely available, making them a good choice for low-power, low-data rate wireless communication. The other frequency bands listed (U-NII, 3.1 GHz, and 60 GHz) are not commonly used for ZigBee networks.

Question 8

Bluetooth divides the 2.4 GHz frequency into 79 frequencies that are spaced how far apart?
A) 5 MHz
B) 22 MHz
C) 11 MHz
D) 1 MHz

Accepted Answer

Bluetooth divides the 2.4 GHz frequency into 79 frequencies that are spaced 1 MHz apart.

Question 9

What is the name of the organization that develops and promotes Bluetooth products and consists of over 2,500 hardware and software vendors?
A) Bluetooth SIG
B) IEEE 802.15.1 Task Group
C) Bluetooth TIA
D) Bluetooth Standards Organization

Accepted Answer

The organization that develops and promotes Bluetooth products and consists of over 2,500 hardware and software vendors is Bluetooth SIG (Special Interest Group). Option B is incorrect because it refers to a specific task group within IEEE (Institute of Electrical and Electronics Engineers) that focuses on Bluetooth standards. Option C and D are not valid organizations.

Question 10

The lower levels of the WPAN protocol stack are implemented in the _____.
A) software
B) hardware
C) IR
D) data link layer

Accepted Answer

The lower levels of the WPAN protocol stack, such as physical layer and medium access control, are typically implemented in hardware.

Question 11

Which of the following is not a feature of Bluetooth?
A) power-saving
B) master and slave changing roles
C) slave authenticates master
D) asymmetric transmission

Accepted Answer

Bluetooth does not inherently feature a mechanism where the slave device authenticates the master. In Bluetooth technology, the master device typically initiates the connection and may authenticate the slave devices, but not the other way around.

Question 12

Which of the following topologies are supported by Bluetooth?
A) scatternet and piconet
B) ACL and SCO
C) WMAN and WLAN
D) star and cluster tree

Accepted Answer

Bluetooth supports scatternet and piconet topologies. ACL and SCO refer to different types of links used in Bluetooth communication, and WMAN and WLAN are different wireless network technologies unrelated to Bluetooth. Star and cluster tree are also not supported topologies in Bluetooth.

Question 13

The amount that the Bluetooth frequency varies, which is between 280 KHz and 350 KHz, is called the ________.
A) direct sequence
B) modulation index
C) hopping sequence
D) i-phase

Accepted Answer

The amount that the Bluetooth frequency varies is called the modulation index. Direct sequence refers to the method used for spreading signals and hopping sequence refers to the sequence of frequency hops used in frequency hopping spread spectrum (FHSS) technology. i-phase is not a term related to Bluetooth technology.

Question 14

Which method of Bluetooth transmission uses two different frequencies to indicate whether the bit is a 1 or a 0?
A) DSSS
B) FHSS
C) GFSK
D) DPSK

Accepted Answer

GFSK (Gaussian frequency shift keying) uses two different frequencies to indicate a 1 or a 0, by shifting the frequency of the carrier wave based on the data being transmitted. DSSS (Direct sequence spread spectrum) spreads a signal across a range of frequencies, FHSS (Frequency-hopping spread spectrum) switches rapidly between different frequencies, and DPSK (Differential phase shift keying) encodes data based on changes in the phase of the carrier wave. However, none of these methods use two different frequencies like GFSK.

Question 15

Which of the following topologies are supported by ZigBee?
A) scatternet and SCO
B) tree, star, and mesh
C) inverted tree and ACL
D) piconet and master/slave

Accepted Answer

ZigBee supports tree, star, and mesh topologies.

Question 16

Which of the following is a feature of WPAN devices?
A) They can transmit signals at a great distance.
B) They are small and can operate on batteries.
C) They transmit signals that do not penetrate walls.
D) Their users cannot roam.

Accepted Answer

WPAN devices are designed to be small and portable, often powered by batteries, making them convenient for personal use. They typically have a short range and their signals are easily blocked by walls or other obstacles. The lack of roaming ability is not necessarily a feature of all WPAN devices but rather a limitation of their range. Therefore, option B is the best choice for a feature of WPAN devices.

Quiz 5: Low Rate Wireless Personal Area Networks

At the lowest level of the Bluetooth protocol stack is the ______ layer.

What type of security is provided for in the ZigBee specification?

Which of the following is not an example of a Bluetooth communication?

The _________ period is when ZigBee devices have time reserved for priority transmissions.

A Bluetooth channel consists of _____________.

What is the maximum data-transmission rate for ZigBee?

Which frequency band(s) can ZigBee networks utilize?

Bluetooth divides the 2.4 GHz frequency into 79 frequencies that are spaced how far apart?

What is the name of the organization that develops and promotes Bluetooth products and consists of over 2,500 hardware and software vendors?

The lower levels of the WPAN protocol stack are implemented in the _____.

Which of the following is not a feature of Bluetooth?

Which of the following topologies are supported by Bluetooth?

The amount that the Bluetooth frequency varies, which is between 280 KHz and 350 KHz, is called the ________.

Which method of Bluetooth transmission uses two different frequencies to indicate whether the bit is a 1 or a 0?

Which of the following topologies are supported by ZigBee?

Which of the following is a feature of WPAN devices?