Câu 29: 642-883: Deploying Cisco Service Provider Network Routing (SPROUTE)

What is recursive lookup in BGP and how does it work?

1. A. The router looks up the EBGP route and the EBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the EBGP next hop using the IBGP.
2. B. The router looks up the IBGP route and the IBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the IBGP next hop using the EBGP.
3. C. The router looks up the BGP route and the BGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the BGP next hop using the IGP. — đáp án hiện tại
4. D. The routerlooks up the route and the next hop to reach a destination in the remote AS using the IGP. Then the router looks up the route to reach the next hop using BGP.
5. E. The router perform three routing lookups to determine the route to reach a destination in theremote AS. The first lookup is done using EBGP, the second lookup is done using IBGP, and the third lookup is done using the IGP.