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As is often the case with computer security, you can’t 100% guarantee that your network will never be cracked. However, taking the security steps can protect you from most threats.
I found "Pure Networks Security Scan tool" an easy way to test the network's security.
Install and Run the scan, and the resulting scorecard provides a summary status of network devices, the router and network, wireless security, and the computer on which you ran the scan. It advises you of the number of issues tested for each category, alerts you to any worrisome issues found. Click View and it gives you a detailed look within each category.
I'm sure there are much more similar softwares that you can find by some googling.
Hope it could help.
We use LanGuard. Pricing is ok for what it is. But the peace of mind knowing that we've done due diligence to keep our users safe helps me to sleep at night. Nobody in IT wants to work nights and weekends fixing a hacked network if they can help it.