Which IFF transponder mode is associated with selective addressing and digital data link?

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Multiple Choice

Which IFF transponder mode is associated with selective addressing and digital data link?

Explanation:
Mode S adds selective addressing and digital data link to IFF. Selective addressing means each aircraft has a unique 24‑bit address, so only the specific aircraft being interrogated replies, reducing clutter and letting ground systems target one aircraft at a time. The digital data link lets more information be exchanged beyond a simple code—things like identity, altitude, velocity, and other flight data—improving surveillance and communications between aircraft and ground stations. The other modes provide basic replies to general interrogations and don’t offer the same targeted addressing or data‑link capabilities.

Mode S adds selective addressing and digital data link to IFF. Selective addressing means each aircraft has a unique 24‑bit address, so only the specific aircraft being interrogated replies, reducing clutter and letting ground systems target one aircraft at a time. The digital data link lets more information be exchanged beyond a simple code—things like identity, altitude, velocity, and other flight data—improving surveillance and communications between aircraft and ground stations. The other modes provide basic replies to general interrogations and don’t offer the same targeted addressing or data‑link capabilities.

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