Which IEEE 802.11 WLAN standard specifies both spread spectrum RF and IR transmission technologies?

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Multiple Choice

Which IEEE 802.11 WLAN standard specifies both spread spectrum RF and IR transmission technologies?

Explanation:
The key idea here is that the earliest IEEE 802.11 specification defined multiple physical-layer options, including spread-spectrum RF methods and infrared (IR) transmission. Spread-spectrum RF, using techniques like FHSS or DSSS, allows wireless communication in shared radio bands with resilience to interference. Infrared provides a completely different medium that does not use radio frequencies. Later 802.11 standards focus on RF technologies (different bands, modulation schemes, and features like OFDM or MIMO) and do not include IR as part of their defined PHY layers. So only the original 802.11 standard specifies both spread-spectrum RF and IR.

The key idea here is that the earliest IEEE 802.11 specification defined multiple physical-layer options, including spread-spectrum RF methods and infrared (IR) transmission. Spread-spectrum RF, using techniques like FHSS or DSSS, allows wireless communication in shared radio bands with resilience to interference. Infrared provides a completely different medium that does not use radio frequencies. Later 802.11 standards focus on RF technologies (different bands, modulation schemes, and features like OFDM or MIMO) and do not include IR as part of their defined PHY layers. So only the original 802.11 standard specifies both spread-spectrum RF and IR.

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