An engineer is configuring BGP as the routing protocol between the CE router of an enterprise and the PE router of the service provider. The interconnection between the CE and PE is direct and is…

BGP outbound route filters control which prefixes are advertised to peers but have no effect on protecting the TCP session itself from hijacking attempts.

GTSM (Generalized TTL Security Mechanism) configures the router to accept BGP TCP packets only if the IP TTL is 255 (or within a configured range), so any attacker not on the directly connected segment will have packets arrive with a decremented TTL and be dropped before the session can be hijacked.

AS path length limiting restricts the number of AS hops in received routes for policy purposes but does not authenticate or protect the BGP TCP session establishment.

BGP communities are route-tagging attributes used for policy decisions on route propagation and have no role in session-level security or authentication.