Final Answer:
The default CoS (Class of Service) value for Voice Data packets in VoIP is c. 5.
Thus the correct option is (C).
Step-by-step explanation:
In Voice over Internet Protocol (VoIP) networks, the Class of Service (CoS) value plays a crucial role in prioritizing and managing different types of data packets. The default CoS value for Voice Data packets is set to 5. This prioritization ensures that voice data, being a real-time and latency-sensitive application, receives preferential treatment over other types of data to maintain high-quality audio during VoIP communication.
The CoS value is a mechanism used in Quality of Service (QoS) implementations to assign priority levels to packets. In the context of VoIP, giving Voice Data packets a higher CoS value, such as 5, helps in the efficient handling of these packets within the network infrastructure. The network devices, such as routers and switches, use the CoS value to make decisions on packet forwarding and queuing, ensuring that voice data is transmitted with minimal delay and jitter.
In summary, the default CoS value of 5 for Voice Data packets in VoIP networks reflects the prioritization of real-time communication. This prioritization is essential for maintaining a smooth and high-quality voice experience, emphasizing the significance of QoS mechanisms in the effective operation of VoIP systems.
Thus the correct option is (C).