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An Ethernet switch can not fulfill the role of a router, unless it be a "layer 3 switch" also known as "multilayer switch", which has capabilities of both a switch and a router - and is more expensive than either (mainly because it is optimized for handling lots of traffic, quickly).

For a small network, you don't really need a router. Routers are used to divide larger networks into smaller subnets, for efficiency, security, and administration. Routers are also used to connect different branches of a company to headquarters, or to each other, via WAN technologies - the router's role, in this case, is to connect the Ethernet network of a company's branch, to a WAN technology.

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