Exam 200-301 topic 1 question 951 discussion

Assured forwarding, look it up

Definitely "C" https://docs.oracle.com/cd/E19253-01/816-4554/ipqos-intro-10/index.html

The Assured Forwarding (AF) behavior is divided into subclasses based on drop probability, with traffic assigned different drop-precedence levels. A. Expedited (EF): No drop subclasses. B. Default (BE): No prioritization or drop classes. D. Class-Selector: No drop probability subclasses.

A is correct Expedited Forwarding (EF): Expedited Forwarding is a Per-Hop Behavior (PHB) in DiffServ that provides a high-priority, low-latency, and low-loss service. It's designed for real-time applications that require minimal delay and jitter, such as voice or video conferencing. EF packets are typically forwarded with minimal processing and queuing delays, ensuring a predictable and expedited delivery path through the network.

Its C Look up Jeremy's It Lab's CCNA course on YT, the dude got us covered

Expedited Forwarding (EF) The expedited forwarding (EF) per-hop behavior assures that any traffic class with EF's related DSCP is given highest priority and is not queued. EF provides low loss, latency, and jitter. The recommended DS codepoint for EF is 101110. A packet that is marked with 101110 receives guaranteed low-drop precedence as the packet traverses diffserv-aware networks en route to its destination. Use the EF DSCP when assigning priority to customers or applications with a premium SLA. Assured Forwarding (AF) The assured forwarding (AF) per-hop behavior provides four different forwarding classes that you can assign to a packet. Each forwarding class provides three drop precedences, as shown in Table 6–2. The various AF codepoints provide the ability to assign different levels of services to customers and applications. In the QoS policy you can prioritize traffic and services on your network when you plan the QoS policy. You can then assign different AF levels to the prioritized traffic.

A. Expedited The DSCP (Differentiated Services Code Point) per-hop forwarding behavior that is divided into subclasses based on drop probability is "Expedited Forwarding (EF)." Expedited Forwarding is typically used for high-priority traffic that requires low loss and low latency, such as voice and video traffic. It offers a higher level of assurance compared to other DSCP behaviors.

The DSCP (Differentiated Services Code Point) per-hop forwarding behavior that is divided into subclasses based on drop probability is the Assured Forwarding (AF) behavior. The AF behavior allows network administrators to assign packets into one of four classes (AF1, AF2, AF3, and AF4), and within each class, packets are further divided into three drop precedence levels: low drop probability (1), medium drop probability (2), and high drop probability (3).

The DSCP per-hop forwarding behavior that is divided into subclasses based on drop probability is the Assured Forwarding (AF) behavior. The AF behavior is divided into 4 subclasses (AF1, AF2, AF3, and AF4), each with 3 drop probabilities. Each forwarding class provides 3 drop precedences, which allow different levels of drop probability to be assigned to packets with different DSCP values. 3 . Therefore, the AF behavior is used to provide a differentiated quality of service for network traffic by dividing it into subclasses based on drop probability.

AF is right