CCDE: Cisco Certified Design Expert (Practical) — Question 190

A large enterprise customer has a single router that uses two active/active 10-Mbps internet links in one of its offices. Each link currently handles approximately 7 Mbps of traffic, which is close to the full link capacity. When a link fails, the failure leads to significantly degraded performance of all applications. Static routing is used. The current ISP cannot deliver additional bandwidth capacity on the existing links. The customer needs a network design that is resistant to failure, but does not increase CAPEX. Which solution should be proposed to the customer?

Answer options

• A. Implement quality of service on the current links.
• B. Add a third link to the current router.
• C. Add an additional edge router connected to a second ISP.
• D. Use dynamic routing for equal-cost multipath.

Correct answer: A

Explanation

Implementing quality of service (QoS) on the current links can prioritize critical traffic, ensuring that even in the event of a link failure, essential applications maintain functionality. Adding a third link would increase capital expenditures, which the client wants to avoid. An additional edge router connected to a second ISP also incurs higher costs and does not address the immediate issue of link performance. Dynamic routing for equal-cost multipath could improve link utilization but does not provide the immediate solution to the performance degradation during failures.