Why is it crucial to change the default SSID, username, and password on a router?

• A. Default SSIDs and their accompanying usernames and passwords are easily found
• B. It improves signal range
• C. It makes firmware update automatic
• D. It ensures device supports IPv6

Answer: (A)

The key point is security. Default SSIDs and admin credentials are widely published and easy to guess. If you leave them as they came from the box, someone nearby could log into your router using those known defaults, change settings, and gain control over your network. That could let them monitor traffic, redirect you to malicious sites, or disable your security entirely. Changing the SSID helps keep your network distinct and less prone to impersonation, and changing the admin password blocks unauthorized access even if someone knows the SSID. Together, they dramatically reduce the chance of someone taking over your router.

These changes don’t directly affect wireless signal range, automatic firmware updates, or IPv6 support, which is why those options aren’t the right reason for making the change.