Firewall: A firewall is a security device that is used to monitor and control incoming and outgoing network traffic. Firewalls are used to protect networks from unauthorized access and other security threats.

The dots represent the nodes in the various topologies, and the lines represent the communication links. Network topologies include the following types:

In addition, many offices only have one printer or a few printers that are shared by everyone. Without a network, the IT department would have to connect every single computer to the printer, which is difficult to implement from a technical standpoint.

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The Domain Name System (DNS) is a critical component of computer networking. It converts easily recognizable domain names, such as , into numerical IP addresses that computers use to identify each other on the network.

The various devices in your home are wirelessly connected to the router, which acts as a central node (server) for the household. The router itself is connected to a much larger network: the Net.

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The links can be configured in different ways, both physically and logically, and the network topology dictates the manner in which links and nodes relate to each other.

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11 standard, or the LTE networks used for mobile devices and smartphones. Wired networks such as DSL are also known as broadband Net.

Computer networks first developed in 1950 for military and defense purpose. At that time they are mainly used to send data through telephone lines 男同网 and had limited use in business or science.

Local Area Network (LAN): Local area networks are among the most widespread networks and are used in households or small and medium-sized companies.