Networking Topologies

The main advantage of using a mesh topology is high reliability. In a mesh network, each device is connected to several others. If one communication path fails, the network can use an alternative path for data transfer, thereby providing network stability and continuous data transmission. Therefore, mesh topology is highly reliable. The other options don't indicate advantages of mesh topology. While a mesh topology may be manageable, it is not inherently easy to install or manage due to complexity in setup and maintenance as each device must be interconnected. Furthermore, inherent to this interconnectivity and redundancy, mesh topology isn't typically considered low cost.

The correct answer is 'Complex to manage'. This is indeed a major disadvantage of a mesh topology. In a mesh topology, every device is connected to every other device on the network via a separate cable. This makes it very complex to set up, manage and troubleshoot. Additionally, it requires a significant amount of cabling, which can add to the cost. The other options presented are not necessarily true. 'Limited cable length' is not inherently a problem with mesh topology. A mesh network can cover a wide area, particularly with the use of wireless technology. 'Not suitable for small networks' also isn't inherently true, as a mesh network could be useful for a small network where high availability and redundancy are crucial. However, it might be overkill due to the management complexity. Lastly, 'Data collisions are frequent' is not accurate, as a mesh network far reduces the chances of data collision because each connection is direct and separate.

In a star topology network, the central switch is the key component that connects all devices. If users are experiencing slow internet connectivity, the first thing a network technician should investigate is the central switch for any performance issues. This is due to the fact that any problem with the switch could affect the entire network's performance. The other options are not the most immediate steps to take. Before replacing all Ethernet cables - which can be costly and time-consuming - it is more logical to check if the central switch is functioning properly. Changing the network topology to a bus topology is not an optimal solution, as it doesn't specifically address the reported issue and could lead to further complications. And lastly, increasing the Internet plan bandwidth might not solve the problem if the issue is not with the bandwidth itself but rather with the network's internal components.