Star Topology

Correct Answer: Check if the connection between the user's device and the switch is functioning properly.

In a network set up with a star topology, all devices are connected to a central device, usually a hub, switch or modem. When a user cannot access the internet, the most likely problem lies in the connection between the user's device and this central switch. Hence the first step to problem solving is to check if the connection between the user's device and the switch is functioning properly. Replacing the user's device may not necessarily solve the issue as the problem might not be with their device. Reconfiguring the entire network is an unnecessary first step when the problem might be with a single connection. Testing the switch's power source isn't the best solution either, as if the switch had no power, no devices in the network would be able to connect to the internet, not just one user.

Correct Answer: Switch with at least 9 ports

A star topology requires a central device to manage the network. As there are 8 computers that need to be connected, the correct option is a switch with at least 9 ports. This allows each computer to have a dedicated port, and also leaves one port for uplink or connecting further devices if needed. Using a Hub with 4 ports would not be sufficient because it provides less than the required number of connections. A Router with 2 ports also cannot provide enough connections. Moreover, both routers and hubs do not have the intelligence that a switch has to manage data traffic most effectively. A Switch with only 5 ports is also insufficient due to the number of computers to be connected is more than what it can provide.

Correct Answer: Check the wiring and connection of the affected user

In a star topology network, all devices are individually connected to a central point, like the 'star' of the network. If only one user is unable to access the internet, then it's highly likely that the issue lies with their individual connection. Hence, the network technician should check the wiring and connection of the affected user. The other answers are flawed because they would not directly address or potentially even identify the problem at hand; replacing the central switch, rebooting all user devices, or updating the router's firmware would likely be unnecessary actions if only one user is affected. They might also potentially disrupt the network for other users - which is currently functioning properly. Therefore, the first step would be to check the individual connection of the affected user.