Which symptom is associated with misconfigured AS numbers?

• A. The AS numbers may be misconfigured.
• B. The neighbor's interface fails.
• C. The BGP delay increases.
• D. The router automatically fixes AS.

Answer: (A)

In BGP, the AS numbers exchanged with a neighbor identify the two neighboring autonomous systems and must align for a session to form. When AS numbers are misconfigured, the most noticeable symptom is that the AS numbers themselves appear incorrect, signaling a config error that prevents the BGP neighbor relationship from coming up. This direct link makes it the best answer, because it points to a problem at the AS configuration level rather than a generic or unrelated issue. By contrast, a neighbor’s interface fault is a hardware/link problem, increased BGP delay can arise from many factors, and a router cannot automatically fix an AS misconfiguration.