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Exam 300-510 topic 1 question 19 discussion

Actual exam question from Cisco's 300-510
Question #: 19
Topic #: 1
[All 300-510 Questions]


Refer to the exhibit. R1 is directly connected to R2 and R3. R1 is in BGP AS 123, R2 is in BGP AS 2, and R3 is in BGP AS 3. Assume that there is no connectivity issue between R1, R2 and R1, R3. Which result between BGP peers R1, R2 and R1, R3 is true?

  • A. The BGP session does not come up between R1 and R2 and between R1 and R3.
  • B. The BGP session comes up between R1 and R2 and between R1 and R3.
  • C. The BGP session comes up between R1 and R3, but not between R1 and R2.
  • D. The BGP session comes up between R1 and R2, but not between R1 and R3.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by foxroot at March 29, 2021, 10:08 a.m.

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foxroot
Highly Voted 3 years, 2 months ago
I think that answer is D. Because we use alternate AS command
upvoted 9 times
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Examtogo
Highly Voted 2 years ago
The correct answer should D. Tested in the lab.
upvoted 6 times
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DUsoo
Most Recent 7 months, 2 weeks ago
Selected Answer: D
The alternate-as keyword is used only with the listen range peer groups, not with individual BGP neighbors!!!!
upvoted 1 times
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DeadHunter
11 months, 1 week ago
Selected Answer: D
Tested it in the lab. With the configuration provided R1 logs these messages: %BGP-3-NOTIFICATION: sent to neighbor 10.1.13.3 active 2/2 (peer in wrong AS) 2 bytes 0003 D is correct.
upvoted 1 times
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ijangulashvili
1 year, 8 months ago
Selected Answer: D
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-dynamic-neighbors.html reading this cisco whitepaper, the alternate-as feature needs dynamic range bgp neighbours, which isnt present in this document, so the answer would be D
upvoted 2 times
nolbi
1 year, 6 months ago
But the Withepaper say this: Note The alternate-as keyword is used only with the listen range peer groups, not with individual BGP neighbors. And the group TEST is the only requierment. So i think B is correct.
upvoted 1 times
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rickyrhcp
1 year, 11 months ago
The answer correct is D, due to is not configure the bgp listen range in the peer group. Test it
upvoted 2 times
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Refrag
1 year, 12 months ago
Selected Answer: B
BGP session comes up with both, but R3 is the alternative.
upvoted 2 times
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Gi0v4ne
2 years, 4 months ago
B is the correct one! https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-dynamic-neighbors.html
upvoted 2 times
ijangulashvili
1 year, 8 months ago
That would be correct if there was any configuration: "bgp listen range ..." In that document the neighbours are dynamically created, not via neighbour statement.
upvoted 1 times
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nolbi
1 year, 11 months ago
I think you are right "A third router—Router E in the figure below—also starts a BGP peering session with Router B. Router E is in the autonomous system 50000, which is the configured alternate autonomous system. Router B responds to the resulting TCP session by creating another dynamic BGP peer." i this example are 2 different AS established
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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