Option A is false . When advertising a route to an IBGP peer, the BGP speaker does not modify the AS_Path. It simply advertises the route as-is , preserving the AS_Path learned from EBGP.
Clarification of the options:
B is correct: When a route is sent to an EBGP peer, the local AS is prepended to the AS_Path.
C is correct: The AS_Path begins with the local AS when a new route is advertised to an EBGP neighbor.
D is correct: IBGP does not modify AS_Path when passing routes within the same AS.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
“BGP speakers prepend their AS number to the AS_Path only when advertising to EBGP peers. IBGP peers do not alter the AS_Path.”
(Chapter: BGP Path Attributes – Section: AS_Path)
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