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| Section | Weight | Objectives |
|---|---|---|
| IEEE 802.11 Network Implementation | 20% | - Site Survey and Design
|
| Radio Frequency (RF) Technologies | 15% | - RF Fundamentals
|
| IEEE 802.11 Network Security | 15% | - Security Basics
|
| IEEE 802.11 Network Operations | 15% | - Troubleshooting
|
| IEEE 802.11 Regulations and Standards | 15% | - IEEE 802.11 Standards
|
| IEEE 802.11 Protocols and Devices | 20% | - CSMA/CA
|
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NEW QUESTION # 139
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?
Answer: C
Explanation:
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.
NEW QUESTION # 140
You are managing a wireless access point in autonomous mode using the Web based interface. You capture traffic during this management task and notice that you can see the HTML code of the Web pages used for access point management. What error in administration could be the cause of this security concern?
Answer: B
Explanation:
The error in administration that could be the cause of this security concern is that HTTP is in use instead of HTTPS. HTTP is an unencrypted protocol that transfers data in plain text over the network. This means that anyone who captures the traffic can see the HTML code of the Web pages used for access point management, as well as any sensitive information such as passwords or configuration settings. HTTPS is an encrypted protocol that uses SSL/TLS to secure the data transmission between the Web browser and the Web server.
HTTPS prevents anyone from snooping on or tampering with the Web traffic. Therefore, HTTPS should always be used for Web based management of wireless access points, especially in autonomous mode where there is no centralized controller to enforce security policies. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 431; [HTTP vs HTTPS: What's The Difference And Why Should You Care?].
NEW QUESTION # 141
An IEEE 802.11 amendment is in the daft state. What impact does this draft amendment have on the 802.11 standard?
Answer: D
Explanation:
An IEEE 802.11 amendment is a proposed change or addition to the existing 802.11 standard, which defines the specifications and protocols for wireless LANs. An amendment goes through several stages of development, such as draft, sponsor ballot, and final approval, before it is ratified by the IEEE Standards Association and becomes part of the standard. Until then, it has no official impact on the standard, although some vendors may release products based on draft amendments to gain a competitive edge or to influence the final outcome of the amendment .
NEW QUESTION # 142
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?
Answer: C
Explanation:
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.
NEW QUESTION # 143
You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?
Answer: C
Explanation:
The data rate of a signal is the speed that the data bits in individual 802.11 data frames are sent, but it does not account for the actual amount of data that can be transmitted over time. The throughput of a connection is the flow of information over time, which is affected by various factors such as data encoding, modulation, encryption, airtime utilization, noise levels, interference, etc. Therefore, the throughput is always lower than the data rate. According to one of the web search results1, the actual throughput is normally 60-70 percent of the supported data rates. So, for a connection with a data rate of 150 Mbps, the expected throughput would be around 90-105 Mbps.
NEW QUESTION # 144
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