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400-007 · Question #402

400-007 Question #402: Real Exam Question with Answer & Explanation

The correct answer is B: Advertise a longer AS PATH to ISP 2. Increase the MED to ISP 2.. To implement a primary and backup link design, a common approach is to manipulate BGP attributes such as AS PATH and MED (Multi-Exit Discriminator). By advertising a longer AS PATH to ISP 2, the primary link (ISP 1) is preferred due to its shorter AS PATH. Increasing the MED to I

Question

Refer to the exhibit. A customer needs to implement a connectivity model by using one active link for inbound and outbound traffic and a second link for backup. The backup link is low speed and is required only during outages of the primary link. Which design solution should be implemented?

Exhibit

400-007 question #402 exhibit

Options

  • AAdvertise a higher local preference to ISP 2. Increase the AS PATH inbound from ISP 1.
  • BAdvertise a longer AS PATH to ISP 2. Increase the MED to ISP 2.
  • CAdvertise more specific routes to ISP 1. Increase the local preference attribute of inbound BGP
  • DAdvertise less specific routes to ISP 2. Increase the AS PATH inbound from ISP 1.

Explanation

To implement a primary and backup link design, a common approach is to manipulate BGP attributes such as AS PATH and MED (Multi-Exit Discriminator). By advertising a longer AS PATH to ISP 2, the primary link (ISP 1) is preferred due to its shorter AS PATH. Increasing the MED to ISP 2 also helps in making it less preferred unless the primary link fails, thereby making ISP 2 the backup link.

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