IEEE 802.11 Fundamentals Quiz

Wireless LAN Standards and Protocols

12 Questions Communication Engineering Undergraduate Level

Part A: Basic Questions (5 Questions)

1
What does IEEE 802.11 primarily define?
Basic
A. Wired Ethernet standards
B. Wireless Local Area Network (WLAN) standards
C. Bluetooth communication protocols
D. Cellular network specifications
2
Which frequency band is commonly used by IEEE 802.11b/g/n standards?
Basic
A. 900 MHz
B. 3.5 GHz
C. 2.4 GHz
D. 60 GHz
3
What is the maximum data rate of IEEE 802.11b?
Basic
A. 11 Mbps
B. 54 Mbps
C. 600 Mbps
D. 1 Gbps
4
Which access method does IEEE 802.11 use to manage medium access?
Basic
A. Token Passing
B. Polling
C. ALOHA
D. CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)
5
What is the primary purpose of the Beacon Frame in IEEE 802.11?
Basic
A. To encrypt data transmissions
B. To announce the presence of a wireless network
C. To acknowledge received data frames
D. To request channel access

Part B: Descriptive Questions (3 Questions)

6
Which IEEE 802.11 amendment introduced Multiple Input Multiple Output (MIMO) technology?
Descriptive
A. 802.11b
B. 802.11g
C. 802.11n
D. 802.11a
7
In IEEE 802.11, what is the function of the Distributed Coordination Function (DCF)?
Descriptive
A. To provide centralized scheduling by the access point
B. To provide distributed contention-based channel access using CSMA/CA
C. To handle encryption and authentication only
D. To manage power saving mechanisms exclusively
8
What is the primary difference between Infrastructure Mode and Ad-hoc Mode in IEEE 802.11?
Descriptive
A. Infrastructure Mode uses an Access Point (AP) while Ad-hoc Mode allows direct station-to-station communication without an AP
B. Infrastructure Mode operates only in 5 GHz while Ad-hoc operates only in 2.4 GHz
C. Infrastructure Mode uses CSMA/CA while Ad-hoc uses CSMA/CD
D. Infrastructure Mode supports only one station while Ad-hoc supports multiple stations

Part C: Analytical Questions (4 Questions)

9
An IEEE 802.11g network operates in the 2.4 GHz band with 22 MHz channel width. If three non-overlapping channels are available (1, 6, 11), what is the maximum number of co-located access points that can operate without interference if each AP must use a unique non-overlapping channel?
Analytical
A. 11
B. 6
C. 22
D. 3
10
In an IEEE 802.11n network using 40 MHz channel bonding with 2 spatial streams and 64-QAM modulation (5/6 coding rate), the theoretical maximum data rate is approximately 300 Mbps. If the modulation is changed to 16-QAM (3/4 coding rate) while keeping other parameters constant, what would be the approximate new data rate?
Analytical
A. 150 Mbps
B. 200 Mbps
C. 135 Mbps
D. 75 Mbps
11
A station in an IEEE 802.11 network detects the medium is busy during the DIFS interval. According to the CSMA/CA protocol, what must the station do next?
Analytical
A. Transmit immediately using the highest priority
B. Wait for the medium to become idle, then wait for DIFS plus a random backoff time before transmitting
C. Send a Request to Send (RTS) frame immediately to reserve the medium
D. Switch to a different channel and transmit there
12
In an ESS (Extended Service Set) with two BSS (Basic Service Sets) connected by a Distribution System (DS), Station A in BSS1 wants to send data to Station B in BSS2. Which MAC addresses are involved in the frame transmission from the AP in BSS1 to the AP in BSS2 across the Distribution System?
Analytical
A. Address 1: AP2 MAC, Address 2: AP1 MAC, Address 3: Station B MAC, Address 4: Station A MAC (4-address frame format)
B. Address 1: Station B MAC, Address 2: AP1 MAC, Address 3: AP2 MAC (3-address frame format)
C. Address 1: Station A MAC, Address 2: Station B MAC (2-address frame format)
D. Address 1: Broadcast MAC, Address 2: AP1 MAC, Address 3: AP2 MAC

Quiz Results

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