1 00:00:00,600 --> 00:00:06,960 The quality of service and guide is a really good guide to use for both study as well as for real world 2 00:00:06,960 --> 00:00:08,070 applications. 3 00:00:08,610 --> 00:00:12,510 It has, as an example, recommendations for classification and marketing. 4 00:00:12,990 --> 00:00:21,450 So as an example, voice traffic should use an IP precedence of five a per hop behaviour or FB, which 5 00:00:21,450 --> 00:00:30,990 is similar in concept to DHCP of F and DHCP of 46 a per hop behaviour essentially is a class. 6 00:00:30,990 --> 00:00:38,800 So what class of traffic will the traffic be put into and how will it be treated on a per hop behaviour? 7 00:00:38,850 --> 00:00:44,940 In other words, by each node in a network, how will your routers and switches treat the traffic? 8 00:00:45,120 --> 00:00:49,020 The physical marking would be 46, so that's the DHCP. 9 00:00:49,080 --> 00:00:56,340 And at layer two, your costs in your editor, the one Q header would be set to five and the MPLS experimental 10 00:00:56,370 --> 00:00:58,410 bits will be set to five as well. 11 00:00:58,620 --> 00:00:59,820 Call signalling. 12 00:00:59,820 --> 00:01:07,590 So a protocol such as CIP or HDD three may use an IP precedence of three per hop behaviour would be 13 00:01:07,590 --> 00:01:13,380 either a F 31 or KES three and the DHCP would be either 26 or 24. 14 00:01:13,410 --> 00:01:21,870 That's because there are differences in the way that phones mark traffic depending on how old they are. 15 00:01:24,050 --> 00:01:32,420 Bulk data, as an example, would have an IP precedence of one per hop behavior of AF 11, DCP of ten 16 00:01:32,420 --> 00:01:35,570 and a cost or experimental value of one. 17 00:01:37,340 --> 00:01:43,520 There are different ways to create classes depending on how close you are to the edge of the network. 18 00:01:43,970 --> 00:01:46,550 If you're at the edge of the network, in other words. 19 00:01:47,570 --> 00:01:51,710 You write here where your pieces and phones are connecting to the network. 20 00:01:52,850 --> 00:01:59,420 You may use multiple classes such as the quality of service baseline model, but in a lot of cases as 21 00:01:59,420 --> 00:02:01,920 you get closer and closer to the core. 22 00:02:01,970 --> 00:02:08,720 So in a core MPLS network as an example, they'll end up only having four or five classes. 23 00:02:08,990 --> 00:02:15,500 They will aggregate traffic classes into fewer classes as you get closer to the core of the network.