© 2006 Cisco Systems, Inc. All rights reserved.ONT v Module Summary DiffServ allows packet classification based on DSCP values. Layer 2 and Layer 3 have different methods for packet classification and marking. NBAR is a tool for class-based packet classification and marking. Queuing algorithms like FIFO, PQ, and round robin are basic packet dispatcher systems. Queuing algorithms like WFQ, CBWFQ, and LLQ combine several queuing techniques into advanced packet dispatcher systems. Congestion-avoidance mechanisms like RED, WRED, and CBWRED monitor network traffic loads to anticipate and avoid congestion before it becomes a problem.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v Module Summary (Cont.) Traffic policing and traffic shaping are used to protect the network resources from malicious connections and to enforce the compliance of every connection to its negotiated SLA. Compression is the process of encoding information using fewer bits. Packets entering IPsec or GRE tunnels need to be preclassified for QoS to work. End-to-end QoS is the strategy to deploy full QoS coverage.

© 2006 Cisco Systems, Inc. All rights reserved.ONT v1.04-3