H31-341_V2.5 · Question #921
Inconsistent FEC sending and receiving configurations will cause service interruption.
The correct answer is A. True. A (True) is correct because FEC (Forward Error Correction) must be symmetrically configured on both ends of a link. FEC works by the sender adding redundant data to transmissions so the receiver can detect and correct errors - but only if both sides agree on the same FEC mode…
Question
Inconsistent FEC sending and receiving configurations will cause service interruption.
Options
- ATrue
- BFalse
How the community answered
(34 responses)- A76% (26)
- B24% (8)
Explanation
A (True) is correct because FEC (Forward Error Correction) must be symmetrically configured on both ends of a link. FEC works by the sender adding redundant data to transmissions so the receiver can detect and correct errors - but only if both sides agree on the same FEC mode (e.g., RS-FEC, FC-FEC, or disabled). A mismatch means the receiver either tries to decode error-correction data that isn't there, or ignores error-correction data that is, resulting in a broken link or continuous errors that interrupt service.
B (False) is incorrect because FEC is not a "best effort" feature - it is a protocol-level agreement. Unlike some optional parameters that degrade gracefully, FEC mismatch directly corrupts the framing layer, so the link cannot stay up.
Memory tip: Think of FEC like a secret code between two people - if one person encrypts and the other doesn't know to decrypt (or vice versa), the message is gibberish. Both sides must speak the same FEC language, or the conversation (link) fails entirely.
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