300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ527

Layer 3 Technologies

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Refer to the exhibits. A company using autonomous system number AS65401 obtained the IP address block 209.165.200.224/27 from ARIN. The company required additional IP addresses and was assigned block 209.165.202.128/27 by ISP2. An engineer at ISP1 reports receiving ISP2 routes from AS65401.

Which configuration on R1 resolves this issue?

  • A
  • B
  • C
  • D
Explanation

Both static Null0 routes are redistributed into BGP, so R1 advertises the ISP2-assigned 209.165.202.128/27 route to ISP1 unless it is filtered. A standard ACL denying that prefix and permitting all other routes, applied with neighbor 209.165.201.1 distribute-list 10 out, suppresses only the ISP2 route in updates sent to ISP1. Cisco documents that a neighbor distribute list with the out direction filters outbound BGP updates.

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