information system audit

When the number of classes of information system audit service has been determined, the details of the required marking, policing, and queuing policies can be addressed. When deciding where to enable such policies, keep in mind that QoS policies always should be performed in hardware instead of software whenever a choice exists

Cisco IOS routers perform QoS in software, which places incremental loads on the CPU (depending on the complexity and functionality of the policy). Cisco Catalyst switches, on the other hand, perform QoS in dedicated hardware ASICS and, as such, do not tax their main CPUs to administer QoS policies. This allows complex policies to be applied at line rates at even 1-Gbps or 10-Gigabit information system audit speeds