300-445 Question 116
Select 2An enterprise VoIP application is experiencing significant call quality issues. Upon investigation, the network team identifies high packet loss and jitter in the network. Which of the following actions can most effectively address these issues in real-time for this application?
- A
Implement Quality of Service (QoS) to prioritize VoIP traffic over other traffic
- B
Increase the available bandwidth on the network by upgrading the WAN links
- C
Enable UDP-based traffic retransmissions for VoIP applications
- D
Configure traffic shaping to limit bandwidth usage of non-critical applications
- E
Switch the VoIP application to TCP to ensure reliable packet delivery
Show answer and explanation
Correct answers: A, D
Explanation
VoIP applications are sensitive to packet loss, jitter, and latency. Implementing QoS ensures that VoIP traffic is prioritized, reducing the likelihood of these issues. Traffic shaping further helps by controlling bandwidth usage of non-critical applications, preventing network congestion. While increasing bandwidth might help in some situations, it does not directly address jitter or packet loss. Using TCP for VoIP is not suitable due to its retransmission mechanisms, which can increase latency and degrade call quality.
- A. Correct.
Implementing QoS ensures VoIP traffic is given priority over other types of traffic, reducing jitter and packet loss for real-time applications.
- B. Incorrect.
Increasing bandwidth can help in some cases but does not directly address jitter or packet loss in real-time; prioritization is more effective for VoIP traffic.
- C. Incorrect.
UDP is a connectionless protocol and does not support retransmissions natively. Enabling retransmissions for VoIP would not be effective as it would increase latency.
- D. Correct.
Traffic shaping can prevent congestion by limiting bandwidth for non-critical applications, ensuring more consistent network performance for real-time VoIP traffic.
- E. Incorrect.
Switching to TCP for VoIP is not recommended because TCP retransmissions and acknowledgments introduce significant latency, which is detrimental to real-time applications like VoIP.