CWNA-108 PDF Dumps May 07, 2024 Exam Questions – Valid CWNA-108 Dumps
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NEW QUESTION # 62
You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming?
- A. FT
- B. Load balancing
- C. Band steering
- D. OKC
Answer: A
NEW QUESTION # 63
What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?
- A. Grid antennas at each endpoint
- B. A minimum antenna gain of 11 dBi at both endpoints
- C. Minimum output power level of 2 watts
- D. A Fresnel Zone that is at least 60% clear of obstructions
Answer: D
NEW QUESTION # 64
What statement about 802.3, Clause 33 Power over Ethernet is true?
- A. The lowest voltage drop is achieved when using CAT6 cable instead of Cat5 or CAT5e.
- B. When using CAT5 cabling, you increase the maximum draw available to the PD over that available with CAT6.
- C. Only endpoint PSEs are supported.
- D. Only midspan PSEs are supported.
Answer: A
Explanation:
Explanation
https://www.cablinginstall.com/articles/2012/08/cat-6a-vs-cat-5e-poe.html 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. References: 1, Chapter 7, page 263; 2, Section 4.4
NEW QUESTION # 65
What is primary metric of scanning can stations use to select the best AP for connectivity to the desired BSS?
- A. Throughput speed in Mbps.
- B. Signal strength of access point beacons received
- C. FCS errors in frames transmitted to and from the AP.
- D. PING latency when testing against an internet server
Answer: B
NEW QUESTION # 66
A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and connects to an
802.11ac AP. Both the client and AP are 2x2:2 devices. What is the likely cause of the low data rate issue?
- A. Too few spatial streams
- B. Weak signal strength
- C. Lack of support for 802.11n
- D. CAT5e cabling run to the AP
Answer: B
Explanation:
Explanation
Weak signal strength is the likely cause of the low data rate issue for the client that has a signal strength of -84 dBm and a noise floor of -96 dBm. The client is an 802.11ac client and connects to an 802.11ac AP. Both the client and AP are 2x2:2 devices. Signal strength is the measure of how strong the RF signal is at the receiver.
Signal strength can affect the reliability and performance of the wireless connection, as well as the data rate and throughput of the traffic. The higher the signal strength, the better the signal quality and the higher the data rate. The lower the signal strength, the worse the signal quality and the lower the data rate.
The data rate of an 802.11ac connection depends on several factors, such as channel bandwidth, modulation and coding scheme (MCS), spatial streams, guard interval, and beamforming. However, these factors are also influenced by the signal strength, as they require a certain signal-to-noise ratio (SNR) to operate properly.
SNR is the ratio of the signal strength to the noise floor, which is the measure of the background noise or interference in the RF environment. The higher the SNR, the more robust and efficient the communication.
The lower the SNR, the more prone and vulnerable to errors and retries.
According to the CWNA Official Study Guide , Table 3.7, page 112, an 802.11ac connection with a channel bandwidth of 80 MHz, an MCS of 9, two spatial streams, a short guard interval, and no beamforming can achieve a maximum data rate of 867 Mbps. However, this data rate requires a minimum SNR of 30 dB to maintain a sufficient signal quality. If the signal strength is -84 dBm and the noise floor is -96 dBm, then the SNR is only 12 dB (-84 dBm - (-96 dBm) = 12 dB), which is far below the required SNR for this data rate.
Therefore, the data rate will drop significantly to match the lower SNR and signal quality.
To solve this problem, the signal strength should be increased to improve the SNR and data rate. This can be done by adjusting the output power or channel assignment of the AP or client, relocating or reorienting some APs or antennas to reduce attenuation or interference, updating or replacing some faulty or outdated hardware or software components, etc. References: , Chapter 3, page 112; , Section 3.2
NEW QUESTION # 67
What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?
- A. An IBSS is used instead of a BSS.
- B. A single AP supports multiple BSSs with different SSIDs.
- C. An SCA network is in use.
- D. Multiple APs have been loaded with the same configuration from an image file.
Answer: A
Explanation:
Explanation
An IBSS is used instead of a BSS is a network configuration that would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses. An IBSS (Independent Basic Service Set) is a type of WLAN that does not use an AP but rather allows stations to communicate directly with each other in a peer-to-peer manner. An IBSS is also known as an ad-hoc network or a peer-to-peer network. In an IBSS, each station generates its own Beacon frames to announce its presence and capabilities to other stations within range. The Beacon frames have the same BSSID, which is randomly generated by one of the stations when creating the IBSS, but they have different source addresses, which are the MAC addresses of each station's radio interface. The BSSID is used to identify the IBSS and prevent stations from joining other IBSSs with different BSSIDs. References: , Chapter 1, page 25; , Section 1.1
NEW QUESTION # 68
A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and connects to an 802.11ac AP. Both the client and AP are 2x2:2 devices. What is the likely cause of the low data rate issue?
- A. Too few spatial streams
- B. Weak signal strength
- C. Lack of support for 802.11n
- D. CAT5e cabling run to the AP
Answer: B
Explanation:
Explanation/Reference:
NEW QUESTION # 69
What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS?
- A. Implementation of several other clients in the same BSS using 802.11g radios
- B. Increasing or decreasing the number of spatial streams in use by the client station and AP
- C. RF interference from more than 10 nearby Bluetooth transmitters
- D. Implementing Fast BSS Transition (FT) for roaming
Answer: D
NEW QUESTION # 70
When implementing PoE, what role is played by a switch?
- A. PSE
- B. Power splitter
- C. Midspan injector
- D. PD
Answer: A
Explanation:
Explanation
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 PSE910. References: CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 293; CWNA-108 Study Guide, Chapter 7: Power over Ethernet (PoE), page 287.
NEW QUESTION # 71
What phrase defines Equivalent Isotropically Radiated Power (EIRP)?
- A. Power supplied from the transmission line to the antenna input
- B. The power output from the radio into the RF cable
- C. The power output from the radio after cable losses
- D. The highest RF signal strength that is transmitted from a given antenna
Answer: D
NEW QUESTION # 72
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
- A. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low powerstate.
- B. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
- C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
- D. Legacy Power Save mode was removed in the 802.11ac amendment.
Answer: C
Explanation:
Until the end of the current TXOP, the client may enter the doze state under specific conditions, using some information such as the RXVECTOR parameter PARTIAL_AID (a TXOP SU PPDU that is addressed to another client, but not that client) or the RXVECTOR parameter GROUP_ID for MU-MIMO (a VHT MU PPDU that is not intended to that client).
https://dot11zen.blogspot.com/2018/02/80211-power-management-with-packet.html
NEW QUESTION # 73
You were previously onsite at XYZ's facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform a post-deployment validation survey.
When performing this type of post-deployment RF site survey for voice over Wi-Fi. what is an action that must be performed?
- A. Application analysis with an active phone call on a VoWiFi handset
- B. Frequency-band hopping analysis to detect improper RF channel implementations
- C. Protocol analysis to discover channel use on neighboring APs
- D. Spectrum analysis to locate and identity RF Interference sources
Answer: D
NEW QUESTION # 74
In a Wi-Fi client configuration utility, what feature is most likely to be user configurable?
- A. WMM-PS Dozing Interval
- B. SNMPv3 Users
- C. 802.1p to WMM mappings
- D. RADIUS Server IP Address
- E. EAP Authentication Type
Answer: E
NEW QUESTION # 75
During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-802.11 device?
- A. Airtime utilization
- B. Receive sensitivity
- C. Protocols utilized
- D. Channel occupied
Answer: A
Explanation:
Airtime Utilization is a per-channel statistic that defines what percentage of the channel is currently being used, and what percentage is therefore free. Airtime usage can come from: Data traffic to and from client devices. Interference from WiFi and non-WiFi sources. Management overhead from APs and client devices. https://wyebot.com/2019/06/06/understanding-airtime-utilization/
NEW QUESTION # 76
The OSI model is a 7-layer model for understanding the functions of a communication system.
What OSI sublayers are specifically addressed by the IEEE 802.11-2012 standard? (Choose 2)
- A. PLCP
- B. MAC
- C. Network
- D. IP
- E. PPDU
- F. Transport
Answer: A,B
NEW QUESTION # 77
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