Canon MX450 Series Online Manual page 456

Restrictions
If you use a printer over the wireless LAN, the printer may recognize nearby wireless systems, you should set a network
key (WEP, WPA, or WPA2) to the access point to encrypt wireless transmission. Wireless communication with a product
that does not comply with the Wi-Fi standard cannot be guaranteed.
Connecting with too many computers may affect the printer performance, such as printing speed.
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