350-401 Question #369: Real Exam Question with Answer & Explanation

Question

Which two network problems indicate a need to implement QoS in a campus network? (Choose two)

Options

• Aport flapping
• Bexcess jitter
• Cmisrouted network packets
• Dduplicate IP addresses
• Ebandwidth-related packet loss

Explanation

QoS Network Problems Explanation

Why B and E are correct: QoS (Quality of Service) is specifically designed to manage traffic prioritization and bandwidth allocation. Excess jitter (B) refers to variable delays in packet delivery, which severely degrades real-time applications like voice and video - a core problem QoS solves through traffic shaping and prioritization. Bandwidth-related packet loss (E) occurs when congestion causes packets to be dropped, and QoS mechanisms like queuing and traffic policing directly address this by ensuring critical traffic gets preferential treatment.

Why the distractors are wrong:

• Port flapping (A) is a Layer 1/2 physical or switching issue (unstable link) - resolved through STP tuning or hardware fixes, not QoS
• Misrouted packets (C) indicate a routing protocol misconfiguration or incorrect routing tables - solved through routing fixes, not QoS
• Duplicate IP addresses (D) are an addressing/DHCP configuration problem - resolved through IP address management (IPAM) tools, not QoS

Memory Tip: Think of QoS as solving "too slow or too lossy" problems - jitter = inconsistent speed, packet loss = data loss from congestion. If the problem is about where packets go or physical link stability, QoS won't help. QoS only manages how traffic is handled, not where it's sent or how links behave.

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