In a NetApp storage solution, VLANs are commonly used to isolate different types of network traffic to improve security and performance. One reason to use VLANs is to isolate management traffic from other IP traffic. This isolation ensures that critical management activities are not disrupted by regular data traffic, enhancing security and overall network efficiency. Another reason is to isolate iSCSI traffic from NAS traffic. Segregating these storage protocols helps ensure optimal performance by reducing the likelihood of congestion and interference between the two different types of traffic.