"Classification: FortiSwitch maps packets with a given CoS or DSCP marking to an egress queue. There are eight egress queues on each port: queues 0 to 7." In Quality of Service (QoS) mechanisms, the process of mapping packets with specific CoS (Class of Service) or DSCP (Differentiated Services Code Point) markings to an egress queue involves two key steps: classification and queuing .
Classification : This occurs on the ingress side (incoming traffic). The switch examines the packet headers (e.g., CoS or DSCP values) to determine how the traffic should be treated. Based on this classification, the switch assigns the packet to a specific priority level or queue.
Queuing : Once the packet is classified, it is mapped to an egress queue based on its priority level. The egress queues are used to manage how traffic is transmitted out of the switch.
Option A (Queuing for egress traffic) refers to managing how packets leave the switch, but it does not involve the initial mapping of CoS/DSCP values to a queue.
Option C (Rate limiting for egress traffic) is about controlling the rate of outgoing traffic, which is unrelated to CoS/DSCP mapping.
Option D (Marking for ingress traffic) involves modifying the CoS or DSCP values of packets as they enter the switch, but it does not map them to an egress queue.
Thus, classification for ingress traffic is the mechanism that identifies and maps packets with specific CoS or DSCP markings to an appropriate egress queue.