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Question 44

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.)

    Correct Answer: A, C, E

    Considering the default BGP advertisement rules: R1 will advertise the route 10.0.0.0/16 to R2 with 192.168.1.1 as the next hop, which aligns with basic IBGP behavior where the next hop does not change. R2 will then advertise the route 10.0.0.0/16 to R4 with 172.16.1.1 as the next hop, which is standard eBGP behavior where the next hop address is updated to the router itself. R4, when advertising this route to R6, will use the next hop of 172.16.1.2, not changing the next hop within the same AS. Therefore, A, C, and E are correct.

Discussion
ce57f43Options: ACE

A,C, E is correct. Next Hop Self rule is for incoming routes, not when you are advertising.

141f14b

C - this answer is still tricky because next-hop-self is not a default behavior on IBGP. But with B,D clearly wrong this seems the way to go.

M80TOptions: ACE

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.

antigel8Options: ACE

ACE is the correct answer

marius2Options: ACE

ACE is correct.

stewegOptions: ACE

I agree with M80T

Bob_SmithOptions: ACE

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.

tsukasa123Options: ABC

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.

a65ecbc

By default R2 does not advertise to R3 because it is learned by IBGP.

Bob_Smith

By default, a router does not re-advertise to an IBGP neighbor a route that itself has learned from IBGP

fukJUNIPEROptions: ACE

R2 will not send the route to R3