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NEW QUESTION # 131
Which unit of measurement, as formally defined, is an absolute unit that is used to quantify received signal power levels on a logarithmic scale?
Answer: B
Explanation:
The unit of measurement that is an absolute unit and is used to quantify received signal power levels on a logarithmic scale is dBm. dBm stands for decibel-milliwatt and represents the power level relative to 1 milliwatt (mW). dBm is an absolute unit because it has a fixed reference point and does not depend on the input power level. dBm is used to measure the received signal power levels on a logarithmic scale because it can express large variations in power levels with small numbers and make calculations easier. For example, a
10 dB increase in power level means a 10-fold increase in power, and a 20 dB increase means a 100-fold increase in power. References: [CWNP Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 66; [CWNA: Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 56.
NEW QUESTION # 132
ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous)
802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator?
Answer: C
Explanation:
The device in the bridge implementation that acts as the 802.1X Authenticator is the root bridge. The root bridge is the bridge that connects to the wired network and acts as the central point for all other bridges in the point-to-multipoint topology. The root bridge authenticates the non-root bridges using 802.1X/EAP and forwards their authentication requests to the RADIUS server. The non-root bridges act as the 802.1X Supplicants and use EAP methods such as EAP-TLS or EAP-PEAP to authenticate with the root bridge. References: [CWNP Certified Wireless Network Administrator Official Study Guide:
ExamCWNA-109], page 459; [Cisco Aironet Wireless Bridges FAQ], question 29.
NEW QUESTION # 133
Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter. What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?
Answer: A
Explanation:
Return loss is a measure of how well the components of an RF system are matched in terms of their impedance. Impedance is the opposition to the flow of alternating current in a circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. When the impedance of the source, the transmission line, and the load are not equal, some of the power is reflected back to the source, causing a loss of forward power. This loss is expressed in decibels (dB) as return loss. The higher the return loss, the lower the reflection and the better the impedance matching. Conversely, the lower the return loss, the higher the reflection and the worse the impedance matching.
VSWR (Voltage Standing Wave Ratio) is another way of expressing the same concept. It is the ratio of the maximum voltage to the minimum voltage along a transmission line due to the interference of the incident and reflected waves. A VSWR of 1:1 means that there is no reflection and perfect impedance matching. A VSWR higher than 1:1 means that there is some reflection and impedance mismatch. The higher the VSWR, the higher the reflection and the lower the return loss. Therefore, a significant impedance mismatch between components in an RF system will cause high reflection, high VSWR, and low return loss.
NEW QUESTION # 134
A wireless engineer is troubleshooting a WLAN and observes a high number of retransmissions on a particular access point. What is a likely cause of this issue?
Answer: C
Explanation:
High retransmission rates typically indicate that frames are being corrupted or lost in transit, often due to RF interference, low signal-to-noise ratio (SNR), multipath issues, or co-channel/adjacent channel interference. When a frame is not properly received or fails its Frame Check Sequence (FCS), the receiver does not send an acknowledgment, prompting the sender to retransmit the frame. Excessive retransmissions consume airtime and reduce overall throughput and network capacity, and are a common symptom investigated during WLAN troubleshooting.
NEW QUESTION # 135
An RF signal encounters a wall as it propagates from a transmitter to a receiver, and some of the signal passes through the wall while losing strength. What is this behavior known as?
Answer: C
Explanation:
Absorption occurs when an RF signal passes through a material, such as a wall, and some of the energy is converted into another form, typically heat, resulting in a loss of signal strength. The amount of absorption depends on the material's composition and thickness; dense materials like concrete or metal cause significantly more absorption than materials like drywall or glass. This differs from reflection, where the signal bounces off a surface, and refraction, where the signal bends as it passes between materials of different densities.
NEW QUESTION # 136
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