350-701 · Question #433
Which CoA response code is sent if an authorization state is changed successfully on a Cisco IOS device?
The correct answer is C. CoA-ACK. CoA-ACK (Acknowledgment) is the response code Cisco IOS sends when a Change of Authorization request is processed and the session's authorization state is updated successfully - it is the standard positive confirmation defined in RFC 5176 for RADIUS dynamic authorization. Why…
Question
Which CoA response code is sent if an authorization state is changed successfully on a Cisco IOS device?
Options
- ACoA-NCL
- BCoA-NAK
- CCoA-ACK
- DCoA-MAB
How the community answered
(24 responses)- C96% (23)
- D4% (1)
Explanation
CoA-ACK (Acknowledgment) is the response code Cisco IOS sends when a Change of Authorization request is processed and the session's authorization state is updated successfully - it is the standard positive confirmation defined in RFC 5176 for RADIUS dynamic authorization.
Why the distractors are wrong:
- CoA-NAK (B): NAK means Negative Acknowledgment - this is sent when the CoA request is rejected or cannot be processed, the opposite of a success response.
- CoA-NCL (A): Not a valid CoA response code; likely a fabricated distractor. Standard CoA responses are only ACK and NAK.
- CoA-MAB (D): MAB stands for MAC Authentication Bypass, which is an authentication method used when a device lacks 802.1X capability - it has no relation to CoA response codes.
Memory tip: Think of ACK as a "thumbs up" - you've seen it in TCP handshakes too. If the change works, you get an ACK; if it fails, you get a NAK. The pattern is consistent across networking protocols: ACK = success, NAK = failure.
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