ccna pdf notes download

ccna pdf notes download.Chapter 21 QoS .425 .2. traffic shaping (TrafficShaping)The typical role of traffic shaping is to limit the amount of traffic flowing out of a particular connection of a network with bursts of traffic so that such packets are sent outward at a more uniform rate. Traffic shaping is typically accomplished using buffers or queues and token buckets, where packets are first cached in a buffer or queue when they are sent too fast, and then the buffered packets are sent evenly under the control of the token bucket. Traffic shaping is usually done to match the packet transmission rate to the downstream device, and the technique usually used is Generic Traffic Shaping (GTS).GTS uses the same token bucket technique as traffic supervision to control traffic, the main difference is that traffic supervision discards packets that do not match the traffic characteristics, while GTS discards packets that do not match the GTS caches packets that do not match traffic characteristics, reducing packet discard and improving link utilization efficiency. The difference between traffic shaping and traffic supervision is shown in Figure 21-3.Figure 21-3 Difference between Traffic Shaping and Traffic Supervision21.4 Configuration Classification and Labeling21.4.1 Experiment 1: Configuration Classification and LabelingThis experiment enables you to master: the methods of classification and marking in QoS. Configuration of classification and marking in QoS..426.Cisco Networking Lab CCNA Lab Guide (Release 2) 2. Experimental TopologyThe experimental topology for configuring classification and marking is shown in Figure 21.4. Classify and mark on router R2: mark ICMP packets from R1 to R3 with IP priority 2; Telnet packets from R1 to R3 with DSCP AF11; HTTP packets from R1 to R3 with DSCP AF22: IP priority of other packets is set to 1, and the entire network runs 0SPFv2 to achieve network connectivity.172.16.12.0/24 172.1623.0/24 Lo0:172.16.3.3/24