Which of the following would be BEST to use to form an internal network?

A hub is an older device that forwards all incoming data to all connected devices, leading to network congestion and reduced efficiency, making it less suitable for modern internal networks.

A switch operates at Layer 2 of the OSI model and efficiently connects multiple devices within a local area network (LAN) by learning MAC addresses and forwarding data frames only to the specific port where the destination device is connected. This prevents unnecessary traffic on other ports, improving network performance and security.

A firewall is a security device used to control network traffic between different security zones (e.g., internal network and the internet), not primarily to form the core internal network connectivity.

A router connects different networks (e.g., a LAN to the internet or multiple LANs together) and routes traffic between them, rather than forming the internal network itself.