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| Section | Objectives |
|---|---|
| Topic 1: WLAN Network Design | - Design principles and planning
|
| Topic 2: WLAN Security and Management | - Security mechanisms and monitoring
|
| Topic 3: WLAN Infrastructure and Devices | - Access points and client devices
|
| Topic 4: WLAN Regulations and Standards | - Wireless standards and amendments
|
| Topic 5: 802.11 Protocol and MAC Layer | - Frame types and communication process
|
| Topic 6: RF Technologies and Fundamentals | - Radio frequency principles and behavior
|
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NEW QUESTION # 89
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
Answer: C
Explanation:
The short guard interval is an optional feature of 802.11n and 802.11ac that reduces the time between OFDM symbols from 800 ns to 400 ns. This can increase the data rate by about 11%, but also requires more precise timing and synchronization between the transmitter and the receiver. The short guard interval is only used when both the AP and the client support it and agree to use it.
NEW QUESTION # 90
A wireless engineer wants to enable both legacy 802.11b clients and modern 802.11ax clients to associate with the same 2.4 GHz SSID. What is a drawback of enabling this level of backward compatibility?
Answer: C
Explanation:
When a BSS supports both legacy 802.11b clients and newer high-throughput clients like
802.11ax, protection mechanisms such as RTS/CTS or CTS-to-Self must be used to prevent collisions between devices using different modulation schemes that cannot always detect each other's transmissions. These protection mechanisms consume additional airtime and overhead, reducing the overall throughput and efficiency available to all clients in the BSS, including the newer, faster devices. For this reason, many administrators choose to disable 802.11b data rates entirely on modern networks.
NEW QUESTION # 91
What term describes the geographic area within which two or more BSSs on the same channel can hear each other's transmissions and must therefore share airtime?
Answer: B
Explanation:
A co-channel contention domain refers to the collection of all BSSs and stations operating on the same channel that are within range of one another and must therefore share the same airtime through the CSMA/CA contention process. As more APs and clients are added to the same co- channel contention domain, available airtime per device decreases, which is why careful channel planning and AP density design are important in minimizing unnecessary overlap between same- channel cells.
NEW QUESTION # 92
What term is used to describe multiple RF signal copies arriving at a receiver at slightly different times due to reflection, refraction, scattering, and diffraction?
Answer: D
Explanation:
Multipath occurs when an RF signal takes multiple paths to reach the receiving antenna due to reflection, refraction, diffraction, and scattering. Because each path has a different length, the signal copies arrive at slightly different times with different phases and amplitudes. Multipath can cause data corruption in legacy systems, but modern 802.11n/ac/ax devices use MIMO technology, including techniques like Maximal Ratio Combining and spatial multiplexing, to take advantage of multipath rather than being negatively affected by it.
NEW QUESTION # 93
What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?
Answer: B
Explanation:
TVHT stands for Television Very High Throughput and it is a PHY defined by the 802.11af amendment. It uses the TV white space (TVWS) spectrum in the VHF and UHF bands between 54 and 790 MHz, which are not in use by broadcast video signals at the time. It can provide long-range and low-power connectivity for WLAN devices.
NEW QUESTION # 94
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