Refer to the exhibit.
On the basis of the configuration that is provided, how would the BGP updates that come from
router R1 be replicated inside autonomous system 65200?
A.
All BGP updates that are received on router R2 will be sent to routers R3 and R4. Routers R3
and R4 will then forward those BGP updates to router R5.
B.
All BGP updates that are received on router R2 will not be sent to routers R3 and R4.
C.
All BGP updates that are received on router R2 will be sent directly to router R5.
D.
None of the BGP updates that are received on router R2 will ever be received by router R5.
Explanation:
All BGP updates that are received on router R2 will be sent to routers R3 and R4 but R3 & R4 will
not forward those BGP updates to R5. This is called the BGP split-horizon rule (which states that
a route learned from one IBGP neighbor will not be advertised to another IBGP neighbor) .
The BGP updates received on router R2 will be sent to R3 and R4 without violating the BGP splithorizon rule because R2 receives updates from an EBGP (R1), not IBGP.
From the configuration of R2, we learn that R2 did not establish neighbor relationship with R5 so
they are not neighbors -> no BGP updates will be sent from R2 to R5.
The BGP split-horizon rule prevents updates received on R2 from being sent to R5 is correct.