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| Certification Vendor: | CWNP |
|---|---|
| Exam Name: | CWNA-109 Certified Wireless Network Administrator Exam |
| Exam Number: | CWNA-109 |
| Exam Format: | Multiple Response, Multiple Choice |
| Exam Price: | USD 300 (approx.) |
| Passing Score: | 70% |
| Related Certifications: | CWDP CWNE CWSP CWAP |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 60-90 |
| Recommended Training: | CWNP Official CWNA Training CWNA Study Guide Resources |
| Exam Registration: | Pearson VUE Registration CWNP CWNA Certification Page |
| Sample Questions: | CWNP CWNA-109 Sample Questions |
| Exam Way: | Computer-based exam delivered via Pearson VUE testing centers or online proctored exam |
| Pre Condition: | No formal prerequisite required; basic networking knowledge recommended |
| Official Syllabus URL: | https://www.cwnp.com/certifications/cwna/ |
>> CWNA-109 Fragen Beantworten <<
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138. Frage
In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when other client stations are actively communicating in the same BSS?
Antwort: C
Begründung:
What prevents each station from using all the airtime when other client stations are actively communicating in the same BSS is CSMA/CA. CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance and is a media access control method used by WLAN devices to share the wireless medium. CSMA/CA works by having each station sense the medium before transmitting a frame. If the medium is busy (i.e., another station is transmitting), the station defers its transmission until the medium is idle. If the medium is idle, the station waits for a random backoff period before transmitting. This way, CSMA/CA reduces the chances of collisions and ensures fair access to the medium for all stations. CSMA/CA also uses positive acknowledgements to confirm successful transmissions and retransmissions to recover from errors.
CSMA/CD, DOS prevention, and OFDMA are not used by WLAN devices in a BSS. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 108; [CWNA:
Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 98.
139. Frage
When considering data rates available in HT and VHT PHY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?
Antwort: C
Begründung:
The guard interval is a short period of time inserted between the symbols of an OFDM signal to prevent inter- symbol interference and improve the robustness of the transmission1. The guard interval can have different values depending on the 802.11 standard and the configuration of the device. For example, 802.11n supports two guard intervals: 800 ns (normal) and 400 ns (short)2. 802.11ac supports the same guard intervals as
802.11n, plus an optional 200 ns guard interval for 80 MHz and 160 MHz channels3. 802.11ax supports three guard intervals: 800 ns, 1600 ns, and 3200 ns4.
The guard interval affects the data rate because it determines the duration of each symbol. A shorter guard interval means more symbols can be transmitted in a given time, resulting in a higher data rate. However, a shorter guard interval also means less protection against inter-symbol interference, which may degrade the signal quality and increase the error rate. Therefore, there is a trade-off between data rate and reliability when choosing the guard interval.
The MCS tables for HT and VHT PHY devices show the data rates for different combinations of modulation, coding, channel width, spatial streams, and guard intervals. For example, for a VHT device using MCS 9 with QAM-256 modulation, 5/6 coding rate, 80 MHz channel width, and one spatial stream, the data rate is 433.3 Mbps with a normal guard interval (800 ns) and 486.7 Mbps with a short guard interval (400 ns)2. Therefore, the guard interval impacts the data rate according to the MCS tables.
140. Frage
You are deploying a WLAN with the access points configured for 10 mW of output power on the
2.4 GHz radios and 20 mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described?
Antwort: D
Begründung:
A high-density deployment is a wireless network that is designed to support a large number of users and devices in a relatively small area. This type of deployment is often used in enterprise environments, such as offices, schools, and hospitals. The use of semi-directional antennas in the deployment described in the question is a good indication that it is a high-density deployment.
Semi-directional antennas can be used to focus the signal from an access point in a specific direction. This can help to reduce interference and improve performance in high-density environments.
The other answer choices are less likely to be correct for the following reasons:
SOHO (small office/home office) deployments are typically smaller and less complex than high- density deployments.
Residential deployments are typically even smaller and less complex than SOHO deployments.
Standard office deployments may be high-density, but they may also be lower-density. It is important to note that the type of deployment is not determined solely by the output power of the access points. However, the use of 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5GHz radios is also consistent with a high-density deployment. Here are some additional tips for deploying a high-density wireless network:
Use a site survey to determine the optimal placement of access points. Configure the access points to use non-overlapping channels. Use semi-directional or directional antennas to focus the signal and reduce interference. Implement a wireless intrusion prevention system (WIPS) to detect and mitigate rogue access points and other security threats.
141. Frage
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?
Antwort: B
Begründung:
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.
142. Frage
An RF signal sometimes bends as it passes through a material rather than around an obstacle.
What is the RF behavior that this statement best describes?
Antwort: B
Begründung:
Refraction is the bending of an RF signal as it passes through a material of different density.
Refraction can cause the signal to change its direction and angle of arrival. For example, when a light beam passes from air to water, it bends because of the difference in the refractive index of the two mediums. Similarly, when an RF signal passes from one medium to another, such as from air to glass, it can bend due to the change in the dielectric constant of the materials.
143. Frage
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