Final answer:
The default Class of Service (CoS) value for Voice Data packets in VoIP is 5, ensuring prioritization over other network traffic for high-quality voice communication.
Step-by-step explanation:
CoS is used to prioritize different types of network traffic. In VoIP, a higher CoS value is assigned to voice packets to ensure their timely delivery and reduce latency. By default, CoS values range from 0 to 7, with 0 being the lowest priority and 7 being the highest. In this case, the correct answer to the question is b. 5.
The default Class of Service (CoS) value for Voice Data packets in Voice over IP (VoIP) communications is typically set to a value that ensures their prioritization over other types of network traffic. This prioritization is important because voice communication needs to be timely and consistent to avoid degradation in quality.
The correct default CoS value for Voice Data packets is 5, which corresponds to the 'Expedited Forwarding' (EF) Per Hop Behavior (PHB) under the Differentiated Services (DiffServ) protocol. These packets are given priority and are intended to experience low loss, low latency, and low jitter while being transported over the network.