ESAT Forouzan - Chapter 15: Wireless Lans Flashcards
A wireless LAN using FHSS hops 10 times per cycle. If the bandwidth of the original signal is 10 MHz, the spread spectrum is _____ MHz.
a. 10
b. 100
c. 1000
d. 10,000
b. 100
A wireless LAN using FHSS hops 10 times per cycle. If the bandwidth of the original signal is 10 MHz and 2 GHz is the lowest frequency, the highest frequency of the system is _____ GHz.
a. 1.0
b. 2.0
c. 2.1
d. 3.0
c. 2.1
An FHSS wireless LAN has a spread spectrum of 1 GHz. The bandwidth of the original signal is 250 MHz, and there are _____ hops per cycle.
a. 1
b. 2
c. 3
d. 4
d. 4
A wireless LAN using DSSS with an 8-bit chip code needs _____ MHz for sending data that originally required a 10-MHz bandwidth.
a. 2
b. 8
c. 20
d. 80
d. 80
A wireless LAN using DSSS with _____-bit chip code needs 320 MHz for sending data that originally required a 20-MHz bandwidth.
a. A 2
b. An 8
c. A 16
d. A 32
c. A 16
A wireless LAN using DSSS with a 4-bit chip code needs 10-MHz for sending data that originally required a _____-MHz bandwidth.
a. 2.5
b. 20
c. 25
d. 40
a. 2.5
In an ESS the _____ station is not mobile.
a. AP
b. Server
c. BSS
d. None of the above
a. AP
In an ESS the _____ stations are part of a wired LAN.
a. AP
b. Server
c. BSS
d. All of the above
a. AP
A station with _____ mobility can move from one BSS to another.
a. No-transition
b. BSS-transition
c. ESS-transition
d. B and C
b. BSS-transition
A station with _____ mobility can move from one ESS to another.
a. No transition
b. BSS-transition
c. ESS-transition
d. B and C
c. ESS-transition
A station with _____ mobility is either stationary or moving only inside a BSS.
a. No-transition
b. BSS
c. ESS
d. A and B
a. No-transition
A _____ frame usually precedes a CTS frame.
a. DIFS
b. SIFS
c. RTS
d. Any of the above
c. RTS
A _____ frame usually precedes an RTS frame.
a. DIFS
b. CIFS
c. CTS
d. None of the above
d. None of the above
Stations do not sense the medium during _____ time.
a. RTS
b. CTS
c. SIFS
d. NAV
d. NAV
Wireless transmission is _____ prone to error than/as wired transmission.
a. More
b. Less
c. Half as
d. None of the above
a. More
Which MAC sublayer does IEEE 802.11 define?
a. LLC
b. PCF
c. DCF
d. B and C
d. B and C
What is the basic access method for wireless LANs as defined by IEEE 802.11?
a. LLC
b. DCF
c. PCF
d. BFD
b. DCF
The access method for wireless LANs as defined by IEEE 802.11 is based on ______.
a. CSMA
b. CSMA/CD
c. CSMA/CA
d. Token passing
c. CSMA/CA
FHSS, DSSS, and OFDM are ______ layer specifications.
a. Physical
b. Data link
c. Network
d. Transport
a. Physical
In the ______ method, the sender hops from frequency to frequency in a specific order.
a. FHSS
b. DSSS
c. OFDM
d. HR-DSSS
a. FHSS
A wireless LAN uses ______ frames for acknowledgement.
a. Management
b. Control
c. Data
d. None of the above
b. Control
A wireless LAN uses ______ frames for the initial communication between stations and the access points.
a. Management
b. Control
c. Data
d. None of the above
a. Management
A Bluetooth network can have ______ meter(s).
a. One
b. Two
c. Three
d. Eight
a. One
______ combine to form a scatternet.
a. BSSs
b. ESSs
c. APs
d. Piconets
d. Piconets
