Which mode allows the configuration of a secure wireless guest network to isolate its traffic without additional changes to the network?

The option that allows the configuration of a secure wireless guest network to isolate its traffic without additional changes to the network is separate zones. When using separate zones, the firewall can create distinct segments for different types of traffic. This means that guest traffic can be isolated from the rest of the internal network effectively, ensuring that guests have limited access and do not interfere with or access sensitive areas of the network.

By utilizing separate zones, administrators can enforce specific security policies, control bandwidth usage, and monitor guest activities independently from internal users, leading to enhanced security and management. This approach also simplifies configurations since it does not require additional physical changes or equipment, such as switches or routers, making it an efficient solution for guest network isolation.

Other modes like bridge mode or VLAN configuration may require more complex configurations or changes to the infrastructure, which is not necessary when using separate zones for isolating guest traffic.