• Illinois State University

• IT 330

IT 377 Homework #5
Part I. (14%) Multiple Choice:
1. What is the min size of the 802.11 frame body
(payload)? A
a. 0
b. 16
c. 46
d. 64
e. depend on 802.11a or 802.11b
2. What are the two operational modes of 802.11-
based WLAN? D
a. point-to-point and group
b. point-to-point and broadcast
c. point-to-point and infrastructure
d. ad hoc and infrastructure
e. ad hoc and network
3. Which wireless access method is better at
supporting time-sensitive applications? D
a. ACF
b. DCF
c. ECF
d. PCF
e. XCF
4. Why is CSMA/CD not applicable to WLAN? B
a. There is no collision on WLAN.
b. Collision signal cannot be detected.
c. CSMA/CA chip is cheaper than
CSMA/CD chip.
d. CSMA/CA was standardized first and it
was too late to change.
e. Vendors preferred CSMA/CA over
CSMA/CD.
f.
5. Which of the following is NOT a control
message of 802.11 WLAN? E
a. RTS
b. CTS
c. ACK
d. POLL
e. Hello
6. What is Network Allocation Vector (NAV)? C
a. A WLAN control message
b. A WLAN equipment
c. A timer to inform other station to wait
d. A WLAN encryption protocol
e. A WLAN authentication protocol
7. Which of the following is the Bluetooth
standard? C
a. 802.1
b. 802.11
c. 802.15.1
d. 802.16a
e. 802.20
Part II- (20%) Complete the following table:
Standards Spread Spectrum
Transmission
Frequency
Band (GHz)
Distance (Indoor) Throughput
(Max)