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Exam 4A0-102 topic 1 question 23 discussion

Actual exam question from Alcatel-Lucent's 4A0-102
Question #: 23
Topic #: 1
[All 4A0-102 Questions]

A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following export policy. The "aggregate 192.168.0.0/16" command is executed. What is the effect of this configuration?

  • A. A single route for 192.168.0.0/16 is advertised.
  • B. BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.
  • C. BGP routes 192.168.1.0/27 and 192.168.2.0/27 are advertised, and 192.168.0.0/16 appears as a "Blackhole" route in the route table only.
  • D. The given export policy is invalid.
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Suggested Answer: C 🗳️
by M2I at April 13, 2022, 1:01 p.m.

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AmrMamdouh
1 year, 5 months ago
from protocol aggregate should be also mentioned in the policy: from protocol aggregate action accept, in order to be advertised by the export policy. since it is not mentioned, only the direct routes are exported.
upvoted 1 times
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M2I
2 years, 7 months ago
Can Someone please explain why C is the correct answer
upvoted 1 times
PRodri
1 year, 9 months ago
BGP routes 192.168.1.0/27 and 192.168.2.0/27 match on the policy, because RT type is "direct" for loopback, therefore advertised. /16 "aggregate" does not. Last is installed at local RT as blackhole (default).
upvoted 2 times
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