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

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QuestionQ58

Layer 3 Technologies

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Refer to the exhibit. R1 must receive 10.16.2.0/24 from R2. Which action resolves the issue?

  • A Add prefix-list seq 1 on R1 to permit 10.16.0.0/22.
  • B Add prefix-list seq 1 on R1 to permit 10.16.2.0/24.
  • C Modify prefix-list seq 5 on R2 to permit 10.16.0.0/22.
  • D Modify prefix-list seq 5 on R2 to permit 10.16.0.0/23.
Explanation

R2’s outbound prefix list permits only routes within the 10.16.0.0/23 range at prefix lengths through /24, so 10.16.2.0/24 falls through to the deny-all entry. Modifying sequence 5 to permit 10.16.0.0/22 expands the permitted range to include 10.16.2.0/24 while retaining the /24 maximum-length constraint. Cisco documents that le sets the maximum prefix length matched by a prefix-list entry.

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