A computer network is a collection of computers that share resources located or provided by network nodes. Computers use common communication protocols over digital interconnections to communicate with each other. These interconnections include telecommunication network technologies, based on physical, optical, and wireless radio frequency methods that can be organized in a number of network topologies.
Computer network nodes may include personal computers,
servers, network hardware, or other specialized or general purpose hosts. They
are identified by hostnames and network addresses. Hostnames serve as honorary
labels for nodes, which are rarely changed after the first assignment. Network
addresses are used to locate and identify nodes using communication protocols
such as the internet protocol.
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