Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

The command used to configure VLAN filtering in a SPAN session is indeed focused on the filter parameter. When you use the command that specifies the filter VLAN option, you are defining which VLANs should be monitored and which ones should be excluded from that monitoring process within the SPAN session. This allows for more specific traffic capture, which can be crucial for analyzing network performance or troubleshooting issues related to particular VLANs without the need to capture everything.

In the context of SPAN (Switched Port Analyzer), filtering is important for optimizing the data that is sent to the destination interface. By specifying a VLAN range, the SPAN session can effectively reduce the amount of unnecessary traffic processed, enabling better performance and easier analysis of the relevant VLANs.

The other options involve setting up the session in different ways, such as designating the source and destination ports or specifying VLANs for monitoring, but they do not directly configure the filtering of specific VLAN traffic, which is pivotal when trying to focus on particular traffic patterns or troubleshooting specific VLANs within a network.