You have just purchased a new wireless router for your home. You first login to the admin console and start configuring the setting. From a security perspective, what is the first thing you should do?
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Answer Description
When you get any new piece of equipment, best practice should be to change default passwords. There is a possibility that these are standard passwords that are easily located online.
Wikipedia
Where a device needs a username and/or password to log in, a default password is usually provided to access the device during its initial setup, or after resetting to factory defaults.
Manufacturers of such equipment typically use a simple password, such as admin or password on all equipment they ship, expecting users to change the password during configuration. The default username and password are usually found in the instruction manual (common for all devices) or on the device itself.Default passwords are one of the major contributing factors to large-scale compromises of home routers. Leaving such a password on devices available to the public is a major security risk.Some devices (such as wireless routers) will have unique default router usernames and passwords printed on a sticker, which is more secure than a common default password. Some vendors will however derive the password from the device's MAC address using a known algorithm, in which case the password can also be easily reproduced by attackers.
Default_password - Wikipedia, the free encyclopedia 