A file server is a computer attached to a network that has the primary purpose of providing a location for the shared storage of computer files.
A firewall is an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system. It is also a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all computer traffic between different security domains based upon a set of rules and other criteria.
A network switch is a computer networking device that connects network segments.A modem is an internal or external computer hardware device that connects your computer to a phone line and, if you wish, to an Internet Service Provider (ISP) that can link you to the Internet.
A network interface card, more commonly referred to as a NIC, is a device that allows computers to be joined together in a LAN, or local area network.
A hub is a small, simple, inexpensive device that joins multiple computers together.
A network operating system (NOS) is software that controls a network and its message (e.g. packet) traffic and queues, controls access by multiple users to network resources such as files, and provides for certain administrative functions, including security.
The Physical Layer is the first level in the seven-layer OSI model of computer networking. It translates communications requests from the data.Routers are physical devices that join multiple wired or wireless networks together.
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