While logged in to your home office router, you notice a log message describing that someone else has recently logged in to the administrative interface. This is a brand new router, and the only person you have given the WiFi credentials to is a guest that was visiting. You suspect that your guest has somehow figured out the password to your router. What important security step did you forget to complete when setting up the new home router?
Change the public IP address.
Change default usernames and passwords.
Download the new firmware.
Lock your router in a secured location.
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