350-401 Question #1087: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Clients are reporting an issue with the voice traffic from the branch site to the central site. What is the cause of this issue?

Options

• AThere is a routing loop on the network
• BThere is a high delay on the WAN links
• CTraffic is load-balancing over both links, causing packets to arrive out of order
• DThe voice traffic is using the link with less available bandwidth

Explanation

Based on the exhibit (not provided), the issue with voice traffic from the branch to the central site is identified as a routing loop, which severely impacts real-time communication.

Common mistakes.

• B. While high delay on WAN links certainly impacts voice quality, it describes an effect rather than the root cause; a routing loop is a more fundamental network issue that directly causes such delays and prevents proper packet delivery.
• C. Traffic load-balancing over multiple links can cause out-of-order packets, which some voice applications can tolerate to a degree or correct, but a routing loop is a more catastrophic failure that prevents traffic from reaching its destination effectively.
• D. Voice traffic using a link with less available bandwidth would lead to congestion and potential packet loss, resulting in poor quality, but a routing loop implies a fundamental pathing problem rather than just a capacity issue.

Concept tested. Network troubleshooting, routing loops, and voice quality

Reference. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/200693-Troubleshoot-Routing-Loop-Issues-with-BGP.html

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