Just as we restarted the iPad, we should also restart the router itself. This can also cure the problem, but you will first want to make sure no one else is currently on the Internet. Restarting the router will also kick people off the Internet even if they have a wired connection.
Restarting a router is a simple matter of turning it off for a few seconds and then powering it back on. If you are unsure how to do this, refer to your router's manual. Most routers have an on/off switch in the back.
Once your router is powered on, it can take from several seconds to several minutes to fully come back up and be ready to accept network connections. If you have another device handy that connects to the network, such as your laptop or smartphone, test the connection on this device before checking to see if it solved the problem for your iPad.