A Network
networking
Interconnected, networked
Just 1 speaker. If you need more you can get more than 1 and link them together.
Network
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This would be called the CPU the Central Processing Unit. I have added a link below in the related links section, which should explain this in more detail.
gateway
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The four fundamental parts of the computer are Processor, Memory, Input devices, and Output devices. Typically, they are tied together by something called a Bus (there may be more than one of any of the preceding).
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Two or more numbers that are multiplied together are called factors. The solution to a multiplication problem is called a product.
A computer that hosts, or rather "serves up" websites is called a Web Server.