the first two are probably connections to the home network. the first one should provide DHCP to the home network. default gateway is 192.168.1.1 and then whatever the computers are. the broadband connection is for the external network so that the router can communicate with the outside world. the third one wireless provides connectivity wireless to the home. I am not sure if people are still using PPoE. ppoe is kinda old now. Verizon does not use it anymore.
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