300-445 Question 184
Single answerA company’s network team has received complaints from users experiencing poor video call quality, including delays and interruptions. Using a network assurance tool, the team collects data showing intermittent packet loss and high jitter on a specific WAN link. What is the most likely root cause of the issue?
- A
Congestion on the WAN link due to insufficient bandwidth capacity
- B
A misconfigured routing protocol causing route flapping
- C
An improperly configured Quality of Service (QoS) policy
- D
A failed network interface card (NIC) on a video server
Show answer and explanation
Correct answer: A
Explanation
The symptoms described, packet loss and high jitter, are classic indicators of network congestion, especially on a specific link. When bandwidth capacity is insufficient to handle the traffic load, packets are delayed or dropped, leading to jitter and packet loss. Addressing congestion, such as by increasing bandwidth or optimizing traffic with QoS, would resolve the issue.
- A. Correct.
Congestion on the WAN link often leads to packet loss and high jitter, which are consistent with the reported symptoms of poor video call quality. This is the most likely cause.
- B. Incorrect.
Route flapping could cause intermittent connectivity issues but is less likely to result in high jitter or packet loss specifically on a single link.
- C. Incorrect.
A misconfigured QoS policy could degrade video call quality, but it would not directly explain high jitter and packet loss on a specific WAN link.
- D. Incorrect.
A failed NIC on a video server would likely cause connectivity loss, but it would not cause intermittent packet loss or jitter specifically on a WAN link.