Cisco ENCOR Practice Exam 2026 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

The Expedited Forwarding (EF) Per-Hop Behavior (PHB) is specifically designed to provide low-latency and low-jitter services, which are critical for applications such as voice over IP (VoIP) and real-time video conferencing. The primary characteristic associated with EF is its low-delay requirement, making it ideal for time-sensitive data.

This PHB works by prioritizing certain types of traffic over others, ensuring that EF-marked packets receive preferential treatment in the network. The goal is to minimize delays, thereby enhancing the user experience for applications where timely delivery is essential. In contrast, the other options describe characteristics that do not align with the purpose of EF.

For instance, while high bandwidth may benefit EF traffic, it is not a defining characteristic; instead, it's more about the timely processing of packets. EF also does not imply high loss tolerance, as it is designed to minimize packet loss for critical traffic. Lastly, EF is not associated with best-effort service conditions, which lack the guarantees for latency and loss that EF aims to deliver. Overall, the focus of the EF PHB is on achieving low-delay, making option B the accurate choice.