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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IEEE 802.11 Regulations and Standards | 15% | - IEEE 802.11 Standards
|
| Topic 2: IEEE 802.11 Protocols and Devices | 20% | - 802.11 Frame Types
|
| Topic 3: IEEE 802.11 Network Operations | 15% | - Performance Optimization
|
| Topic 4: IEEE 802.11 Network Implementation | 20% | - Power over Ethernet (PoE)
|
| Topic 5: IEEE 802.11 Network Security | 15% | - Encryption and Authentication
|
| Topic 6: Radio Frequency (RF) Technologies | 15% | - RF Fundamentals
|
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NEW QUESTION # 146
What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS? (Choose 2)
Answer: C,D
Explanation:
The factors that will have the most significant impact on the amount of wireless bandwidth available to each station within a Basic Service Set (BSS) are:
A). The number of client stations associated to the BSS
More client stations sharing the same BSS will reduce the available bandwidth for each station, as all clients must share the available airtime.
C). The presence of co-located (10m away) access points on non-overlapping channels Even though the channels are non-overlapping, the presence of nearby access points can still impact performance due to contention for airtime, especially if the access points are close together. This can lead to interference and reduce overall efficiency.
NEW QUESTION # 147
ABC Company is planning to install a new 802.11ac WLAN, but wants to upgrade its wired infrastructure first to provide the best user experience possible. ABC Company has hired you to perform the RF site survey. During the interview with the network manager, you are told that the new Ethernet edge switches will support VoIP phones and 802.11 access points, both using
802.3 PoE.
After hearing this information, what immediate concerns do you note?
Answer: C
Explanation:
An immediate concern that you note after hearing this information is that the power budget in the edge switches must be carefully planned and monitored based on the number of supported PoE devices. PoE stands for Power over Ethernet and is a technology that allows Ethernet switches to deliver power along with data to devices such as VoIP phones and 802.11 access points. PoE devices are classified into different classes based on their power consumption and output. The edge switches have a limited power budget that determines how many PoE devices they can support simultaneously. If the power budget is exceeded, some PoE devices may not receive enough power or may shut down unexpectedly. Therefore, it is important to plan and monitor the power budget in the edge switches based on the number and class of PoE devices connected to them. Using Ether- channel, placing switches in optimal locations, or avoiding distortion are not immediate concerns related to PoE devices.
NEW QUESTION # 148
What cipher suite is specified by the 802.11-2016 standard and is not deprecated?
Answer: B
Explanation:
The cipher suite specified by the 802.11-2016 standard and is not deprecated is Counter Mode with CBC-MAC Protocol (CCMP). CCMP is an encryption protocol that uses Advanced Encryption Standard (AES) as the underlying cipher and provides confidentiality, integrity, and origin authentication for wireless data. CCMP is the mandatory encryption protocol for WPA2 and WPA3. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 295; [IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications], page 1560.
NEW QUESTION # 149
What can an impedance mismatch in the RF cables and connectors cause?
Answer: A
Explanation:
VSWR stands for Voltage Standing Wave Ratio, which is a measure of how well the impedance of the RF cable and connectors matches the impedance of the transmitter and the antenna. Impedance is the opposition to the flow of alternating current in an RF circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. A perfect impedance match would have a VSWR of 1:1, meaning that all the power is transferred from the transmitter to the antenna, and none is reflected back. However, in reality, there is always some degree of mismatch, which causes some power to be reflected back to the transmitter, creating standing waves along the cable. This reduces the efficiency and performance of the wireless system, and can also damage the transmitter. Excessive VSWR can be caused by using poor quality or damaged cables and connectors, or by using components that have different impedance ratings123. References: CWNA-
109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 90; CWNA-109 Study Guide, Chapter 2:
Radio Frequency Fundamentals, page 86; CWNP website, CWNA Certification.
NEW QUESTION # 150
You have implemented an 802.11ax WLAN for a customer. All APs are four stream HE APs. The customer states that it is essential that most of the clients can use the OFDMA modulation scheme. What do you tell the customer?
Answer: B
Explanation:
OFDMA is a new modulation scheme introduced in 802.11ax that allows multiple users to share the same channel by dividing it into smaller subchannels called resource units (RUs). This improves the efficiency and capacity of the WLAN by reducing contention and overhead. However, to use OFDMA, both the AP and the client must support 802.11ax and negotiate the parameters of the subchannel allocation. Therefore, the customer needs to upgrade the clients that require OFDMA to 802.11ax devices12.
The other options are not correct because they do not reflect the reality of OFDMA. Option B is incorrect because OFDMA is a mandatory feature of 802.11ax for both downlink and uplink transmissions, and all
802.11ax APs must support it1. Option C is incorrect because OFDM and OFDMA are different modulation schemes, and OFDM does not allow multiple users to share the same channel. Option D is incorrect because
802.11ac devices cannot support OFDMA through driver upgrades, as they lack the hardware and firmware capabilities to do so2.
References: 1:CWNA-109Official Study Guide, page 144 2: OFDMA
NEW QUESTION # 151
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