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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Protocols and Devices | 20% | - Wireless hardware and software
|
| Topic 2: Radio Frequency (RF) Technologies | 20% | - RF fundamentals and behavior
|
| Topic 3: WLAN Troubleshooting and Management | 15% | - Performance and connectivity issues
|
| Topic 4: WLAN Network Architecture and Design Concepts | 15% | - WLAN deployment architectures
|
| Topic 5: WLAN Network Security | 15% | - Security threats and mitigation
|
| Topic 6: WLAN Regulations and Standards | 15% | - IEEE 802.11 standards and amendments
|
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16. Frage
When implementing PoE, what role is played by a switch?
Antwort: C
Begründung:
PoE stands for Power over Ethernet, which is a technology that allows network devices to receive power and data over the same Ethernet cable. PoE eliminates the need for separate power adapters or outlets for devices such as IP phones, cameras, or APs. PoE requires two types of devices: PSE (Power Sourcing Equipment) and PD (Powered Device). A PSE is a device that provides power to the Ethernet cable, such as a switch, injector, or splitter. A PD is a device that receives power from the Ethernet cable, such as an IP phone, camera, or AP. When implementing PoE, a switch plays the role of a PSE.
17. Frage
A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?
Antwort: D
Begründung:
To calculate the EIRP at the antenna element, we need to add the transmitter output power, subtract the cable loss, and add the antenna gain. All these values need to be converted to dBm first, if they are not already given in that unit. In this case, we have:
Transmitter output power = 50 mW = 10 log (50) dBm = 16.99 dBm Cable loss = 3 dB Antenna gain = 9 dBi EIRP = Transmitter output power - Cable loss + Antenna gain EIRP = 16.99 - 3 + 9 EIRP = 22.99 dBm Rounding up to the nearest integer, we get 23 dBm as the EIRP at the antenna element12. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page
92; CWNA-109Study Guide, Chapter 2: Radio Frequency Fundamentals, page 88.
18. Frage
What statement about 802.3, Clause 33 Power over Ethernet is true?
Antwort: B
Begründung:
The statement that the lowest voltage drop is achieved when using CAT6 cable instead of Cat5 or CAT5e is true about 802.3, Clause 33 Power over Ethernet. Power over Ethernet (PoE) is a technology that allows electrical power to be delivered over Ethernet cables along with data signals. PoE is defined by IEEE 802.3, Clause 33 and has several variants, such as PoE (802.3af), PoE+ (802.3at), and PoE++ (802.3bt). PoE works by using a device called PSE (Power Sourcing Equipment) that injects power into the Ethernet cable and a device called PD (Powered Device) that receives power from the Ethernet cable. The PSE can be either an endpoint device, such as a switch or a router, or a midspan device, such as an injector or a splitter, that is inserted between two Ethernet devices. The PD can be any device that requires power, such as an access point, a camera, or a phone. One of the factors that affects PoE performance is voltage drop, which is the reduction of voltage that occurs as current flows through a cable due to its resistance. Voltage drop can cause power loss and inefficiency in PoE systems, as well as damage to PDs if the voltage falls below their minimum requirement. To minimize voltage drop, it is recommended to use high-quality cables with low resistance and short length. Among the common types of Ethernet cables, CAT6 has the lowest resistance and therefore the lowest voltage drop compared to Cat5 or CAT5e. CAT6 also has higher bandwidth and data rate than Cat5 or CAT5e, making it more suitable for PoE applications.
19. Frage
What condition occurs when two or more APs operating on the same channel are within range of each other, causing them to share airtime through the CSMA/CA contention process?
Antwort: D
Begründung:
Co-channel interference (CCI) occurs when two or more APs, or BSSs, are configured on the same channel and are within range of each other. Because they operate on the same channel, they must share airtime using the CSMA/CA contention mechanism, meaning only one device can transmit at a time to avoid frame corruption. While technically not "interference" in the destructive sense of corrupting a signal, CCI reduces available airtime and overall network throughput as more devices compete for the same channel.
20. Frage
A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?
Antwort: D
Begründung:
PoE has different standards that define different power levels for PSEs and PDs. The original standard, IEEE
802.3af, defines two classes of PSEs: Class 3 (15.4 W) and Class 4 (30 W). The newer standard, IEEE 802.3 at, also known as PoE+, defines four classes of PSEs: Class 0 (15.4 W), Class 1 (4 W), Class 2 (7 W), and Class 3 (12.95 W). The power level received at the PD is always lower than the power level provided by the PSE, due to cable resistance and power dissipation. The IEEE standards specify the minimum power level that must be received at the PD for each class of PSE. For a Class 4 PSE, the minimum power level received at the PD is 25.5 W910. References: CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page
295; CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 289.
21. Frage
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