Answer: Install the latest firmware updates from the device manufacturer.
Verify that your network's existing security infrastructure is working properly
Step-by-step explanation:
Since the person is concerned about the security of these devices, in order to increase their security posture, the latest firmware updates should be installed fom the device manufacturer.
The firmware is the software program or set of instructions which is programmed on a hardware device. Installing the latest update is necessary in order to prevent third party use or hacking. Also, it's vital to check the network's existing security infrastructure in order to check if it's working properly.