12.2.2 - Range and Signal Strength

Flashcards covering key concepts related to range and signal strength in networking as discussed in CertMaster Perform Network+ 9.1.

Indoor Range for Wi-Fi

At least 30 meters (100 feet) for devices supporting the Wi-Fi standard.

Dynamic Rate Switching/Selection (DRS)

A mechanism that allows a station to select data rates based on signal quality.

RSSI (Received Signal Strength Indicator)

The strength of the signal from the transmitter measured at the client end.

Signal-to-Noise Ratio (SNR)

The comparative strength of the data signal to background noise, expressed in dB.

Effect of Noise on Signal

Closer values to zero in noise measurements represent higher noise levels.

Negative dBm Values

Indicate a fraction of a milliwatt; for example, -30 dBm is 0.001 mW.

802.11n and Later Standards

Improvements in Wi-Fi technology that enhance range compared to earlier standards.

Interference Sources

Devices like fluorescent lighting, microwave ovens, and cordless phones can cause interference.

200 dBm represents

A perfect signal strength for Wi-Fi, while -80 dBm indicates potential packet loss.

SNR Example Calculation

If signal is -65 dBm and noise is -90 dBm, SNR is 25 dB.