Click the Exhibit button. Referring to the exhibit, which three statements are correct about route 10.0.0.0/16 when using the default BGP advertisement rules? (Choose three.)
A.
R2 will advertise 10.0.0.0/16 to R4 with 172.16.1.1 as the next hop.
B.
R2 will advertise 10.0.0.0/16 to R3 with 192.168.1.1 as the next hop.
C.
R1 will advertise 10.0.0.0/16 to R2 with 192.168.1.1 as the next hop.
D.
R1 will prepend AS 65531 when advertising 10.0.0.0/16 to R2.
E.
R4 will advertise 10.0.0.0/16 to R6 with 172.16.1.1 as the next hop.
B is incorrect, as an BGP router cannot send an IBGP route out to another IBGP peer (unless its configured as a route-reflector)
D is incorrect as the AS Path attribute only gets prepended when advertising over EBGP peerings.
A, C, E
A- R2 will advertise 10.0.0.0/16 to R4 with 172.16.1.1 as next-hop...Standard eBGP behavior changing the next hop to self when redistributing iBGP routes to eBGP
C - R1 will advertise 10.0.0.0/16 to R2 with 192.168.1.1 as next-hop. Basic iBGP behavior
E - R4 will advertise 10.0.0.0/16 to R6 with 172.16.1.1 as next-hop. When advertising routes learned from eBGP to iBGP neighbors, the next-hop is not changed by default.
Since R1 is connected to R2 and R3 with ibgp neighbor, next-hop is not changed and 192.168.1.1 is advertised.
R2 is connected to R4 with ebgp neigibor, so 172.16.1.1 is advertised as the next-hop.
R4 advertises nexthop 172.16.1.2 to R6.
By default, a router does not re-advertise to an IBGP neighbor a route that itself has learned from IBGP
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