Should You Buy a Router If Your ISP Gives You a Combined Router/Modem?: "Many Internet service providers are now giving their customers combined devices that function as both a modem and a wireless router. With these devices, you don’t have to buy a router — but you can, if you like.
While separate routers can be more powerful, configurable, and feature-filled, that isn’t necessarily a good thing for everyone. Whether you should get a separate router or not depends on what trade-offs you want to make."
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