Replacement of Cisco with Airport Express

Why would devices WiFi connected to a router (Cisco) eplaced by new router (Apple Airport Express) not automatically connect if the name and password were identical?
I replaced a Cisco EA4500 with and Airport Express.  I used the same name and password.  Nearly all my devices on the network including my Macbook and Brother printer did not communicate to the new Airport Express until I went through the setup procedure again on the Brother and manually selected the network name with my Macbook.  My old Dell computer did not have a problem.  It connected automatically to the new Airport router.
The only difference between the two routers was that the IP address was completely different.  Would that affect them connecting automatically?
My Macbook Pro had a problem reconnecting automatically at first until I went into the advanced network section and deleted the old network entry that was established by my Cisco router.  Then it connected automatically.

Why would devices WiFi connected to a router (Cisco) eplaced by new router (Apple Airport Express) not automatically connect if the name and password were identical?
Some devices "remember" more information about the router that they connect to than just the network name and password. Some devices "remember" the MAC Address....a unique device ID...as part of the connection.
Since the MAC Address is different on every device, even though you used the same wireless network name and password, some devices would not recognize the new router since it had a different MAC Address.
Once you set up a new connection on your MacBook Pro, for example, it remembers the information about the "new" router. If you change routers again, then you will have to set up a new connection again on the MacBook Pro and other devices that store more data about the connection.

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