200-301 Question #1029: Real Exam Question with Answer & Explanation

Question

A network engineer is upgrading a small data center to host several new applications, including server backups that are expected to account for up to 90% of the bandwidth during peak times. The data center connects to the MPLS network provider via a primary circuit and a secondary circuit. How does the engineer inexpensively update the data center to avoid saturation of the primary circuit by traffic associated with the backups?

Options

• AAssign traffic from the backup servers to a dedicated switch.
• BConfigure a dedicated circuit for the backup traffic.
• CPlace the backup servers in a dedicated VLAN.
• DAdvertise a more specific route for the backup traffic via the secondary circuit.

Explanation

To cost-effectively offload high-bandwidth backup traffic, advertise a more specific route for that traffic through the existing secondary circuit.

Common mistakes.

• A. Assigning traffic to a dedicated switch only provides LAN-side isolation and does not control the traffic's egress path over the WAN circuits.
• B. Configuring a new dedicated circuit would be a costly solution, which directly contradicts the question's requirement for an inexpensive update.
• C. Placing backup servers in a dedicated VLAN provides Layer 2 segmentation but does not inherently direct their Layer 3 traffic over a specific WAN circuit.

Concept tested. Route specificity for traffic engineering

Reference. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/200782-BGP-Best-Path-Selection-Algorithm.html

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