VLANs can be assigned based on service types during campus network planning.

The statement is correct. In campus network design, VLANs (Virtual Local Area Networks) are a fundamental tool for logical network segmentation. A common and effective strategy for VLAN planning is to assign them based on service types. This involves creating separate VLANs for different kinds of traffic, such as a voice VLAN for VoIP phones, a data VLAN for user workstations, a management VLAN for network devices, and a guest VLAN for visitor access. This approach enhances security by isolating traffic, improves performance by controlling broadcast domains, and simplifies network management and the application of Quality of Service (QoS) policies.

This is a "True or False" question; therefore, there is no incorrect option to analyze.

1. Huawei HCIA-Datacom V1.0 Training Material. (2020). Chapter 3: VLAN Principles and Configuration. The material explains that VLANs can be divided based on ports, MAC addresses, IP subnets, protocols, and policies, which includes service-based division as a practical application of policy-based VLANs.

2. Comer, D. E. (2018). Computer Networks and Internets (6th ed.). Pearson. Chapter 20, Section 20.10, "VLANs, Virtualization, and VPNs," discusses the use of VLANs to create logically separate networks, often for different departments or purposes (services), over a single physical infrastructure.