Which method can be used to separate broadcast domains in a network?

Utilizing VLANs (Virtual Local Area Networks) is an effective method for separating broadcast domains within a network. VLANs allow network administrators to create distinct logical networks that operate independently, even if they share the same physical infrastructure. Each VLAN acts as its own broadcast domain, meaning that broadcast traffic sent by devices in one VLAN won’t affect devices in another. This reduction in unnecessary broadcast traffic enhances overall network efficiency and performance, which is especially important in environments with a high volume of network traffic.

By configuring VLANs, network administrators can enhance security, manageability, and scalability. Devices assigned to the same VLAN can communicate freely with each other, while communication across different VLANs can be controlled through Layer 3 devices like routers. This makes VLANs a powerful tool for organizing network resources and isolating traffic based on function, department, or any other criteria deemed necessary.

The other methods listed do not effectively separate broadcast domains like VLANs do. For instance, installing separate routers for each device creates a complex and expensive scenario without the efficiency gained from VLANs. Creating additional multicast groups pertains to managing multicast traffic rather than defining broadcast domains, and implementing a star topology speaks to the physical arrangement of the network rather than the logical segmentation of broadcast communications.