Cisco Enterprise Network Core Technologies (ENCOR) Practice Exam

The primary feature of Differentiated Services (DiffServ) in networking is to deliver specific types of services based on Quality of Service (QoS) requirements. This approach allows for the prioritization of various types of traffic by distinguishing between different classes of service. In a DiffServ-enabled network, packets are classified and marked according to their QoS needs, which facilitates various treatment levels throughout the network. For example, mission-critical applications like VoIP or video conferencing may receive higher priority compared to standard data traffic, ensuring that time-sensitive information is transmitted with minimal delay and jitter.

This selective handling of traffic types is essential in maintaining network performance and user experience, especially in environments with diverse application requirements. By applying different levels of service based on the specific needs of each traffic class, DiffServ effectively manages bandwidth utilization and enhances overall network efficiency.

The other options do not encapsulate the primary capability of DiffServ. Providing a single unified service level overlooks the essence of differentiation, while support for only real-time traffic does not accurately reflect the flexibility offered by DiffServ to cater to both real-time and non-real-time traffic. Classifying all packets as best-effort contradicts the very principle of differentiating services since it does not establish any form of QoS