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Exam 350-501 topic 1 question 221 discussion

Actual exam question from Cisco's 350-501
Question #: 221
Topic #: 1
[All 350-501 Questions]


Refer to the exhibit. An administrator working for large ISP must connect its two POP sites to provide internet connectivity to its customers. Which configuration must the administrator perform to establish an iBGP session between routers PE1 on POP site 1 and PE2 on POP site 2?

  • A. PE2#configure terminal PE2(config)#router bgp 65111 PE2(config-router)#no neighbor 172.18.10.1 shutdown PE2(config-router)#end
  • B. PE1#configure terminal PE1(config)#router bgp 65111 PE1(config-router)#no neighbor 172.19.10.10 shutdown PE1(config-router)#end
  • C. PE1#configure terminal PE1(config)#router bgp 65111 PE1(config-router)#address-family ipv4 unicast PE1(config-router-af)#neighbor 172.19.10.10 activate PE1(config-router-af)#end
  • D. PE2#configure terminal PE2(config)#router bgp 65111 PE2(config-router)#address-family ipv4 unicast PE2(config-router-af)#neighbor 172.18.10.1 activate PE2(config-router-af)#end
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Suggested Answer: D 🗳️
by AlirezaNetWorld at Sept. 8, 2022, 9:30 a.m.

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nottoday2077
Highly Voted 2 years, 4 months ago
Answer is D. If you shutdown the neighbor it is shutdown for all AF, so A and B can not be the solution as both would have to be IDLE if the peer was shutdown on PE2. Since the configuration is from the perspective of PE1, if it was no active under the IPv4 AF on PE1, it would not show up in a 'sh bgp * all sum" output, IPv4 would be missing. Meaning it is active on PE1 and not active on PE2 and needs to be neighbor active on PE2.
upvoted 7 times
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5b4b7da
Most Recent 6 months, 1 week ago
Selected Answer: A
Its A, if you use no neighbor x.x.x.x activate. the show bgp will only show the ipv6 session. if you simply do shutdown both session will be shown.
upvoted 1 times
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sushil_bhattacharjee
1 year, 3 months ago
Selected Answer: D
Once I enable the ipv4-addfam-in R2, then it resolves the probelm I had the lab. if iPv4 is not activated at R2: then result in R1 as given below- R1(config-router)#do sh bgp * all summary For address family: IPv4 Unicast BGP router identifier 172.18.10.1, local AS number 1 BGP table version is 1, main routing table version 1 Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 172.19.10.10 4 1 0 0 1 0 0 00:02:06 Idle For address family: IPv6 Unicast BGP router identifier 172.18.10.1, local AS number 1 BGP table version is 1, main routing table version 1 Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 172.19.10.10 4 1 6 6 1 0 0 00:01:59 0
upvoted 2 times
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sushil_bhattacharjee
1 year, 3 months ago
Answer: D I have done the lab and simulated the scenerio. R2#sh run | s router bgp router bgp 1 bgp router-id 172.19.10.10 bgp log-neighbor-changes neighbor 172.18.10.1 remote-as 1 neighbor 172.18.10.1 update-source Loopback0 ! address-family ipv4 no neighbor 172.18.10.1 activate exit-address-family ! address-family ipv6 neighbor 172.18.10.1 activate exit-address-family R2#sh bgp * all summary For address family: IPv6 Unicast BGP router identifier 172.19.10.10, local AS number 1 BGP table version is 1, main routing table version 1 Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 172.18.10.1 4 1 5 5 1 0 0 00:01:30 0 --------------------------------------------------------------------------------------------------------------------------------
upvoted 2 times
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thejag
2 years, 3 months ago
Selected Answer: D
Agree with below discussion, D is correct.
upvoted 1 times
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DUsoo
2 years, 3 months ago
Selected Answer: D
Should be D
upvoted 1 times
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ccie_race
2 years, 7 months ago
D is correct Since R1 is trying to connect IPv4 adjacency, it means it has 'address-family ipv4 activated". This needs to be activated on R2
upvoted 3 times
cname404
2 years, 6 months ago
if an address family is activated only on one of the BGP peers, the output will show nothing for that AF on the peer where is not activated, and "noneg" on the peer where is activated. Also if a the BGP session is in shut down, all AFs will be idle, shut down can be cfg only per peer, not per AF. I guess something is wrong in the output.
upvoted 1 times
cname404
2 years, 6 months ago
I did the initial test in gns3 on some old IOS, I did the test again in "IOS-XE" and te state "idle" not "noneg", so for newer IOS-XE ver .. D is corect
upvoted 3 times
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mohdema
2 years, 7 months ago
Selected Answer: A
Answer is A If Sesssion is shut down on PE1 the command will show nothing as a result If Session is shut down on PË2 the command will show Active If Session is NO Activate on PE2 the command will show Idle If session is No Activate on PE1 the command will show Idle (Admin)
upvoted 1 times
thejag
2 years, 3 months ago
You mean D from what you are saying, not A from the answers showing now.
upvoted 4 times
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gilgo23
2 years, 7 months ago
Selected Answer: D
Las modificaciones se deberian de hacer en el P2, ya que en PE1 si no lo tiene configurado como shutdown, apareceria en estatus "idle (admin)" y en caso de que no tuviera el comando "activate" no apareceria el vecino en el output, por lo que la acciones deberia de realizarse en el PE2. Analizando mejor, la respuesta correcta deberia de ser la D, ya que si pones el comando shutdown al vecino, no deberia de ver la sesion ipv6 up, por lo que solo deberia de activar al vecino debajo de la address family de ipv4
upvoted 2 times
jospinales
1 year, 10 months ago
You are absolutely right. If we shutdown the neighbor on PE2, both address families will be in adle state, however in this case just address familiy ipv4 it is in addle state, meaning that address familiy ipv4 it is not activated. A tested it in a lab and realized it was true.
upvoted 1 times
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gilgo23
2 years, 7 months ago
Las modificaciones se deberian de hacer en el P2, ya que en PE1 si no lo tiene configurado como shutdown, apareceria en estatus "idle (admin)" y en caso de que no tuviera el comando "activate" no apareceria el vecino en el output, por lo que la acciones deberia de realizarse en el PE2. Analizando mejor, la respuesta correcta deberia de ser la D, ya que si pones el comando shutdown al vecino, no deberia de ver la sesion ipv6 up, por lo que solo deberia de activar al vecino debajo de la address family de ipv4
upvoted 1 times
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gilgo23
2 years, 7 months ago
Las modificaciones se deberian de hacer en el P2, ya que en PE1 si no lo tiene configurado como shutdown, apareceria en estatus "idle (admin)" y en caso de que no tuviera el comando "activate" no apareceria el vecino en el output, por lo que la acciones deberia de realizarse en el PE2. Creo que la opcion correcta deberia de ser A o D
upvoted 1 times
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rvolfoni
2 years, 9 months ago
With B, we would have "Idle (Admin)" With C, we wouldn't have the status Idle With A & D, we could have Idle status to PE1.
upvoted 2 times
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AlirezaNetWorld
2 years, 9 months ago
I think, the right answer is supposed to be "C"
upvoted 3 times
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C (25%)
B (20%)
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