Name the four IFF responses?

• A. Not Interrogated
• B. No Response
• C. Invalid
• D. Valid

Answer: (A)

When you think about IFF identification, there are four possible states that describe what can happen after an interrogation: a valid, authentic reply; a reply that is invalid or fails the checks; no reply at all after an interrogation; and the target not having been interrogated yet. The option Not Interrogated is one of these four recognized states, which is why it is the correct pick in this item. It shows you know the terminology used to describe every outcome in the IFF process. The other states—No Response, Invalid, and Valid—complete the same four-state set: No Response means the interrogator received nothing back, Invalid means the reply failed validation, and Valid means a proper, authenticated reply was received.