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R and D guide has a lot of examples that you can look at.

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So as an example in a campus environment we may have what's called conditionally trusted endpoints.

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So as an example a switch would trust the markings that it receives on a port when it sees a phone through

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CTP.

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Phones are trusted but pieces are not.

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So you'll only trust the markings that you receive when you see a phone connected to the switch.

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Port so with regards to trust again the switch will trust the marking from a phone but not the marking

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from a P.C..

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So the trust boundary ends at the phone the switch will say I see that you're a phone so I'll trust

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your costs but a piece costs will not be trusted.

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So if a phone makes its traffic with a costs of 5 for the voice and signalling set to 3 that will be

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accepted by the switch and may change those values to DCP a 46 and a DSP of 24.

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If a P.C. sets its costs to 5 The phone will automatically reset it to 0 and the switch will also not

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trust the traffic received by P.C.

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they saw indeed Guide covers many switch models and many options with regards to trusting certain traffic

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types but not trusting other traffic types as an example here.

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The switches trusting the costs of value that it receives from a phone it uses what are called Class

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maps a class map is a way to create groups or classes of traffic so in this example the order was VoIP

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RTP trust is matching traffic with a DSP of 46 that's voice traffic the VoIP control trust class is

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matching DSP is of 24 and 26 now based on those values something can be done with the traffic.

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And in this example various queuing options are set so traffic is poor terrorised on queues on the switch

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based on the traffic type that's received.

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There are different ways to queue traffic on a switch.

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The hardware switches will dictate how you can queue the traffic so the number of queues supported as

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an example is dependent on hardware.

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But essentially the idea is that you can pro try some traffic types over other traffic types by using

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a queue in the same way that first class passengers approach tries to over economy class passengers.