CompTIA Network+

The correct choice is to add a layer 3 switch and create a VLAN. VLANs (Virtual Local Area Networks) allow for logical segmentation of a network, where each VLAN acts as its own broadcast domain, thereby reducing broadcast traffic. A layer 3 switch is capable of routing between these VLANs, thus allowing different network segments to communicate with each other. While routers and layer 3 switches both handle inter-VLAN routing, a layer 3 switch is specifically designed for this purpose in a switched network environment.

Traffic shaping is used to define how much bandwidth can be allocated to different protocols on the network. By prioritizing certain types of traffic and delaying others, it ensures that the network bandwidth is used efficiently, optimizing the performance of critical applications.

To authenticate remote workers who connect from offsite, RADIUS and 802.1x are commonly used. RADIUS is a protocol that centralizes authentication, authorization, and accounting for users accessing a network. It is often employed by ISPs and enterprises to manage remote access. 802.1x is a standard for network access control that provides an authentication mechanism for devices wishing to connect to the network, ensuring that only authenticated clients can access the network resources. These two options complement each other in providing secure authentication for remote users.