Which routing protocol is used inside a transit AS to carry routes learned via EBGP?

ITExamAnswers Editorial Team Last Updated: Jun 29, 2026

IT Exam Items Repository › Category: CCNP ENARSI v9 › Which routing protocol is used inside a transit AS to carry routes learned via EBGP?

Which routing protocol is used inside a transit AS to carry routes learned via EBGP?

EIGRP
OSPF
IBGP
IS-IS

Explanation: IBGP is the only protocol used within a transit AS to carry external routes learned via EBGP because it can preserve all BGP attributes across the backbone. Other IGPs like OSPF or EIGRP cannot scale to handle the volume of Internet routes or carry BGP-specific attributes.

About The Author

ITExamAnswers Editorial Team

The ITExamAnswers Editorial Team is a dedicated group of certified IT professionals and network engineers. We rigorously review, verify, and update all exam materials to ensure you receive the most accurate and reliable resources for your certification journey.