Refer to the exhibit. The R1 and R2 configurations are:
The neighbor relationship is not coming up.
Which two sets of configurations bring the neighbors up? (Choose two.)
A.
B.
C.
D.
E.
300-410 Exam QuestionsBrowse all questions from this exam
300-410 Exam - Question 53
Show AnswerHide Answer
Correct Answer:
To establish a BGP neighbor relationship between R1 and R2 using their respective loopback addresses (10.1.1.1 and 10.1.1.2), you need to ensure that the routers can route packets to each other's loopback addresses and that the source of the BGP packets is the loopback interface. Additionally, BGP's check for direct connectivity has to be disabled since the loopbacks are not directly connected. The correct configurations are: 1) On R1: add a static route to R2's loopback, set the update-source to loopback 0, and disable the connected check. 2) On R2: add a static route to R1's loopback, set the update-source to loopback 0, and disable the connected check. These configurations ensure the proper packet routing and that the BGP session can establish. Therefore, the correct answers are D and E.
Discussion
11 commentsdrxz
May 3, 2023De and E is correct ; The disable-connected-check was created precisely for the purpose of peering two directly connected routers on their loopbacks without using the ebgp-multihop https://ipwithease.com/using-disable-connected-check-in-cisco-bgp/
examShark
Aug 3, 2021The given answer is correct
Carl1999
Feb 2, 2022・About the operation of disable-connected-check When disable-connected-check is set, regardless of the referenced route Send the packet with TTL = 1. With disable-connected-check not set, The router that is trying to send a packet with TTL = 1 has the referenced route If it is "C" (direct connection), send a packet. "S" (Statec route) or "O" (OSPF) ,do not send packets.
Hack4
Feb 10, 2022The given answer is correct
Huntkey
Sep 10, 2022I didn't lab this but I think "ttl-security hops" have to be at least 2 for it to work. Therefore, the answer is correct.
yonig
Apr 11, 2023the only problem i have is that the loopbakc is not directly connected - you need another hop. but the ttl security command works the opposite from the multi-hop command. so the value should be 254 or multu hop 2. am i wrong ? unless you have reachabiity using IGP.
HungarianDish
May 29, 2023Confirmed solution "D"+"E" in CML lab.
inteldarvid
Jul 11, 2023D and E anwser correct. I test in my lab. Its works
conft
Aug 24, 2023D and E is the correct.
vallzo
May 31, 2024D & E are correct. If you configure TTL mulithop 2+ it would also work, and it implicit configures the disable connected check
SeMo0o0o0
Jul 17, 2024D & E are correct