In public Wi-Fi environments, it's common to implement security measures that prevent clients from communicating directly with each other. This is achieved through peer-to-peer blocking, also known as client isolation. When enabled, this feature ensures that each client can communicate with the AP and access external networks but cannot interact with other clients on the same WLAN.
This setup enhances security by reducing the risk of attacks or unauthorized access between clients.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:
Let's calculate the total loss/gain step by step:
Cable Loss:Each meter reduces the signal by a factor of 4. Over 10 meters:
Total attenuation factor = 4^10 = 1,048,576
In dB: 10 * log10(1,048,576) # 60 dB loss
Amplifier Gain:Output is 8 times the input:
Gain in dB: 10 * log10(8) # 9 dB gain
Filter Loss:Given as 5 dB loss.
Total Loss/Gain:
Total = Cable Loss - Amplifier Gain + Filter Loss
Total = 60 dB - 9 dB + 5 dB = 56 dB loss
However, this calculation leads to 56 dB loss, which is not among the provided options. Let's reassess the cable loss calculation.
Upon reevaluation:
Each meter reduces the signal by a factor of 4, so per meter loss in dB: 10 * log10(4) # 6.02 dB Over 10 meters: 6.02 dB/m * 10 m = 60.2 dB loss Now, total loss/gain:
Cable Loss: 60.2 dB
Amplifier Gain: 10 * log10(8) # 9.03 dB
Filter Loss: 5 dB
Total = 60.2 dB - 9.03 dB + 5 dB # 56.17 dB loss
Rounded to the nearest whole number:56 dB loss
Reference:CWDP-305 Study Guide, Chapter on Infrastructure Design - Signal Loss and Gain Calculations.

PMK caching(Pairwise Master Key caching) is a roaming technology where the access point (AP) stores the PMK derived during the initial authentication of a client station (STA).If the client roams away and then returns to the same AP, the stored PMK allows for a quicker re-association without the need for a full authentication process.
This mechanism enhances roaming efficiency by reducing latency during re-association, which is particularly beneficial for applications sensitive to delays, such as VoIP.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis