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4A0-M01 · Question #112

4A0-M01 Question #112: Real Exam Question with Answer & Explanation

The correct answer is A. CSA1 moves traffic to the secondary spoke SDP, where it crosses to endpoint SAP and travels through ICB-PW spoke 3:100/MLS1.. See the full explanation below for the reasoning.

Question

Given the diagram shown and the following information:
  • Configured on CSA1 and the two MLS routers provide redundant ePipe 10
  • Interchassis Backup Pseudowires (ICB-PW) provide a path of last resort to the Customer Edge (CE) access points (SAPs)
  • A Multichassis Link Aggregation Group (MC-LAG) protects the CE access ports
  • The primary spoke Service Distribution Group (SDP) has failed How does the ePipe service ensure that traffic continues flowing to the CE devices?

Options

  • ACSA1 moves traffic to the secondary spoke SDP, where it crosses to endpoint SAP and travels through ICB-PW spoke 3:100/MLS1.
  • BCSA1 moves traffic to the secondary spoke SDP and the MLS1 MC-LAG control protocol switches the active LAG member to MLS2.
  • CCSA1 moves traffic to the secondary spoke SDP, where it enters endpoint SPOKE and travels through ICB-PW spoke 3:101/MLS1.
  • DCSA1 moves traffic to the secondary spoke SDP, where MLS2 drops the traffic on ingress since the configuration shown is incorrect.

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