400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ214

Network Design

A large enterprise customer uses a single router with two active/active 10-Mbps Internet links in one office. Each link presently carries approximately 7 Mbps of traffic, close to its full capacity. If one link fails, all applications experience significantly degraded performance. Static routing is in use, and the current ISP cannot provide additional bandwidth on the existing links.

The customer requires a failure-resistant network design without increasing CAPEX. Which solution should be proposed?

  • 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.
Explanation

QoS manages congestion by classifying traffic into queues and scheduling packets according to assigned priorities. When a link failure leaves only 10 Mbps available for roughly 14 Mbps of demand, QoS on the existing links can preserve performance for critical applications without adding a circuit or router. Dynamic equal-cost multipath can distribute traffic but cannot provide the missing capacity after a link fails.

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