AS_Path is a well-known mandatory attribute (not discretionary).
AS_Path characteristics:
A. TRUE → When advertising to IBGP peers, AS_Path remains unchanged to prevent routing loops.
B. TRUE → BGP uses AS_Path to detect loops (if a router sees its own AS in the path, it rejects the route).
C. FALSE → AS_Path is well-known mandatory, not discretionary.
D. TRUE → BGP ignores AS_Confed_Sequence and AS_Confed_Set when calculating the AS_Path length.
???? Reference: Huawei HCIA-Datacom Study Guide, BGP Path Attributes and Loop Prevention.
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