Chapter 5Review Questions
1. A Bluetooth channel consists of ____________.
a.
b.
c.
d.
a specific frequency channel
an IEEE 802.15.1 channel
a hopping sequence including up to 79 frequencies
a frequency range that the signal spreads across
2. Which of the following is not an example of a Bluetooth communication?
a.
b.
c.
d.
smartphone phone to headset
laptop computer to smartphone
hard drive to memory
laptop computer to GPS
3. Which of the following is not a feature of Bluetooth?
a.
b.
c.
d.
power-saving
master and slave changing roles
slave authenticates master
asymmetric transmission
4. What is the name of the organization that develops and promotes Bluetooth products and
consists of over 14,000 hardware and software vendors?
a.
b.
c.
d.
Bluetooth SIG
IEEE 802.15.1 Task Group
Bluetooth TIA
Bluetooth Standards Organization
5. The lower layers of a Bluetooth WPAN protocol stack are implemented in the
____________.
a.
b.
c.
d.
software
hardware
IR
data link layer
6. At the lowest level of the Bluetooth protocol stack is the ____________ layer.
a.
b.
c.
d.
RF
L2CAP
TCP/IP
Link Manager
7. Which of the following is a feature of WPAN devices?
a.
b.
c.
d.
They can transmit signals at a great distance.
They are usually small and can operate on batteries.
They transmit signals that do not penetrate walls.
Their users cannot roam.
8. The ____________ is when ZigBee devices have time reserved for priority transmissions.
a.
b.
c.
d.
contention access period
GTS
beacon period
time synchronization period
9. Which method of Bluetooth transmission uses two different frequencies to indicate whether
the bit is a 1 or a 0?
a.
b.
c.
d.
DSSS
FHSS
GFSK
DPSK
10. The amount that the Bluetooth frequency varies, which is between 280 KHz and 350 KHz, is
called the ____________.
a.
b.
c.
d.
direct sequence
modulation index
hopping sequence
i-phase
11. 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
12. A ZigBee coordinator cannot allocate guaranteed time slots for devices to transmit data. True
or False?
13. Bluetooth has seven different power classes. True or False?
14. Objects (such as walls) and interference from other sources do not usually affect the range of
Bluetooth transmissions. True or False?
15. Bluetooth devices are usually small and mobile, so conserving power is necessary. True or
False?
16. What is the maximum data-transmission rate in ZigBee WPANs?
a.
b.
c.
d.
2 Mbps
721 Kbps
250 Kbps
40 Kbps
17. Which frequency band(s) can ZigBee networks utilize?
a.
b.
c.
d.
e.
ISM
U-NII
3.1 GHz
60 GHz
All of the above
18. Which of the following topologies are supported by ZigBee?
a.
b.
c.
d.
scatternet and SCO
tree, star, and mesh
inverted tree and ACL
piconet and master/slave
19. Which of the following topologies are supported by Bluetooth?
a.
b.
c.
d.
scatternet and piconet
ACL and SCO
WMAN and WLAN
star and cluster tree
20. What type of security is provided for in the ZigBee specification?
a.
b.
c.
d.
e.
encryption
MIC
short-range communications
ACLs
All of the above
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