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Your company has established a hybrid cloud environment using FastConnect to connect your on-premises network to your OCI VCN. You are advertising on-premises network prefixes to OCI via BGP. You want to ensure that OCI only learns routes from your on-premises network that are within a specific range, and that any other prefixes advertised are rejected to prevent routing conflicts. Which BGP attribute and configuration on the OCI side should you use to achieve this?
Correct Answer: D
* Objective:Filter BGP routes on OCI to accept only specific on-premises prefixes. * BGP Attributes Overview: * AS Path Prepending:Lengthens AS path to influence route preference, not filtering. * MED:Influences exit point selection, not route acceptance. * RD/RT:Used in MPLS VPNs for tenant isolation, not simple prefix filtering. * Prefix Lists:Directly filter prefixes based on IP ranges. * Evaluate Options: * A:AS Path Prepending affects preference, not filtering; unsuitable. * B:MED influences path selection, not route rejection; incorrect. * C:RD/RT is for VPN contexts, not applicable here. * D:Prefix Lists explicitly allow/deny prefixes, meeting the requirement. * Conclusion:Prefix Lists on the FastConnect virtual circuit provide precise control over accepted routes. Prefix Lists are the most effective BGP tool for filtering routes in OCI. The Oracle Networking Professional study guide notes, "Prefix Lists can be applied to FastConnect virtual circuits to filter BGP advertisements, ensuring only approved prefixes are learned by OCI" (OCI Networking Documentation, Section: FastConnect and BGP). This prevents routing conflicts by rejecting unwanted prefixes, aligning with the security and control requirements.
