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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IEEE 802.11 Network Security | 15% | - Security Basics
|
| Topic 2: IEEE 802.11 Network Operations | 15% | - Performance Optimization
|
| Topic 3: IEEE 802.11 Regulations and Standards | 15% | - Regulatory Bodies and Domains
|
| Topic 4: IEEE 802.11 Network Implementation | 20% | - Deployment Models
|
| Topic 5: Radio Frequency (RF) Technologies | 15% | - Antenna Concepts
|
| Topic 6: IEEE 802.11 Protocols and Devices | 20% | - 802.11 Frame Types
|
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質問 # 147
Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. Assuming no other APs are in the vicinity, is CCI still a possibility in this network and why?
正解：A
解説：
CCI is still a possibility in this network because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as clients connected to the other channel 1 AP. CCI stands for co-channel interference, which is a type of interference that occurs when two or more devices transmit on the same channel within range of each other. CCI reduces performance and capacity because it causes contention and collisions on the wireless medium, which leads to retransmissions and delays. CCI can be mitigated by increasing physical separation between devices using the same channel or by reducing transmit power levels to limit coverage area. In this scenario, three access points are used within a facility.
One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere with each other when they transmit frames. However, this does not prevent CCI from occurring between their client devices that are connected on channel 1. For example, if a client device connected to one of the channel
1 APs sends a frame to another device on the wired network or on another wireless network (such as an Internet server or a VoIP phone), that frame will be heard by both channel 1 APs as well as any other client devices connected to either of them on channel 1. This will cause CCI because these devices will have to wait for the channel to be clear before they can transmit their own frames. The answer that CCI only occurs in the
5 GHz frequency band is incorrect; CCI can occur in any frequency band where devices use the same channel.
The answer that channel 11 loops around and causes CCI with channel 1 is also incorrect; channel 11 does not loop around and it operates in a different frequency band than channel 1. References: CWNA-109 Study Guide, Chapter 5: Radio Frequency Signal and Antenna Concepts, page 147
質問 # 148
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?
正解：B
解説：
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-109 Study Guide, Chapter 2:
Radio Frequency Fundamentals, page 88.
質問 # 149
A network administrator wants to reduce co-channel interference in a high-density 2.4 GHz deployment. What is the recommended best practice for channel planning in this band?
正解：C
解説：
In the 2.4 GHz band, only three channels, 1, 6, and 11, are non-overlapping when using standard
20 MHz channel widths in regions like the United States. Using any other channels, or overlapping adjacent channels, results in adjacent channel interference, which degrades performance for all nearby devices. Best practice for 2.4 GHz deployments is to design the channel reuse pattern using only channels 1, 6, and 11, and to avoid 40 MHz channel bonding in this band due to the limited number of available channels.
質問 # 150
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?
正解：C
解説：
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.
質問 # 151
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain. What is the power level at the Intentional Radiator?
正解：C
質問 # 152
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