What are the two ways to reduce overhead when using DHCP attributes for profiling?

Reducing overhead when using DHCP attributes for profiling is achieved through specific techniques that optimize data handling and reduce unnecessary load on the network. Using SPAN (Switched Port Analyzer) with VACL (VLAN Access Control List) Capture is effective in this context because it allows you to selectively capture DHCP packets without flooding the network with unnecessary data.

When SPAN is configured with VACL Capture, it ensures that only the relevant DHCP traffic is mirrored to the monitoring interface. This focused approach minimizes the amount of irrelevant traffic collected and processed, allowing for better resource utilization. By capturing only the essential DHCP attributes needed for profiling, network devices can operate more efficiently, reducing both bandwidth consumption and processing overhead for the profiling mechanism.

In contrast, other methods listed do not offer the same level of efficiency or are geared towards different functions. For instance, SPAN without VACL Capture would capture all traffic passing through a port, which could lead to an increase in overhead, as it includes unnecessary data. Meanwhile, using a Device Sensor on Cisco IOS devices is more related to device profiling rather than specifically focusing on reducing DHCP profiling overhead. DHCP helper serves a different purpose by aiding in the forwarding of DHCP packets on a network and does not relate to the optimization of profiling overhead.