Objective

My home network is having Wi-Fi issues, and some older network devices are no longer working properly.
I want to resolve these issues and also better secure Wi-Fi access.
I also want to document the entire home network.

Result

After a complete review of my network topology, the problematic network devices were identified.
Migration of all connections from 1GbE to 2.5GbE is possible using the existing cabling,
and was tested after purchasing a new unmanaged switch with 8x 2.5GbE ports.

All Wi-Fi bridges, hubs, and extenders were outdated, problematic, and were removed.
They were replaced by a single, powerful Wi-Fi router (in bridge mode) centrally located in the house.
With the correct antenna orientation, there was excellent Wi-Fi reception everywhere (no mesh required).

The room with the new 2.5GbE switch is used as a workspace.
Various devices are used here: a Windows PC, a Linux notebook, and an NVR server for security cameras.
All these devices were connected to a newly purchased KVM device,
allowing them all to be controlled with a single shared screen, keyboard, and mouse.

The ISP’s gateway router only has four 1GbE ports, all of which are used for the wired network.
As a result, the network isn’t fully 2.5GbE, and I can’t connect any additional devices directly.
I also don’t have access to the configuration of this ISP-provided router.
This will be addressed in a future network upgrade.