Which of the following should a network administrator deploy to control all preventive security measures?

An administrator recently implemented new SOHO routers for a company's teleworking employees. Before deploying the routers, the administrator changed the default credentials and disabled unnecessary services.
Within a few days of deployment, hackers gained access to the routers. Which of the following is the MOST important thing the administrator forgot to do?

A user checks an IP address using an external website. The address is different than the one the user sees when opening a command prompt and typing in ipconfig/all. The user does not understand why the two tools show different IP addresses. This is BEST explained by the interworking of:

A wireless administrator has configured a secure wireless network that can only be associated to specific domain accounts. This was done to help mitigate any risks associated with the wireless signal propagating outside of the facility. Which of the following has the administrator implemented?

A network technician installed a new host on the network. The host is not connecting to the company's cloud servers. The technician attemtps to ping a server using the AP address with no success. Checking the IP address using ipconfing displays:

Which of the following should the technician perform NEXT to determine where the issue is located?