As previously mentioned, trusting end users and their PCs is generally a bad idea because computer network assessment or newer operating systems such as Windows XP and Linux make it relatively easy to set CoS or DSCP markings on PC NICs. Such markings can be set deliberately or even inadvertently. In either case, improperly set QoS markings could affect the service levels of multiple users within the enterprise and make troubleshooting a nightmare. Also, marking application traffic on server NICs has disadvantages (discussed in the previous section) that might make it preferable to treat these as untrusted devices.
Although client PCs and data center servers are related and complimentary, they also have unique considerations that affect their classification and marking policies, so they are examined individually next.
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