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See how Cisco TrustSec takes the complexity out of network security at http://cs.co/6054BPj4O. Subscribe to Cisco's YouTube channel: http://cs.co/6054QiQr.

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A virtual private network (VPN) is an overlay network in which some of the links between nodes are carried by open connections or virtual circuits in some larger network (e.g., the Internet) instead of by physical wires. The data link layer protocols of the virtual network are said to be tunneled through the larger network when this is the case. One common application is secure communications through the public Internet, but a VPN need not have explicit security features, such as authentication or content encryption. VPNs, for example, can be used to separate the traffic of different user communities over an underlying network with strong security features.

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Network security consists of provisions and policies adopted by the network administrator to prevent and monitor unauthorized access, misuse, modification, or denial of the computer network and its network-accessible resources. Network security is the authorization of access to data in a network, which is controlled by the network administrator. Users are assigned an ID and password that allows them access to information and programs within their authority. Network security is used on a variety of computer networks, both public and private, to secure daily transactions and communications among businesses, government agencies and individuals.

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The Internet is the largest example of an internetwork. It is a global system of interconnected governmental, academic, corporate, public, and private computer networks. It is based on the networking technologies of the Internet Protocol Suite. It is the successor of theAdvanced Research Projects Agency Network (ARPANET) developed by DARPA of the United States Department of Defense. The Internet is also the communications backbone underlying the World Wide Web (WWW).

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An intranet is a set of networks that are under the control of a single administrative entity. The intranet uses the IP protocol and IP-based tools such as web browsers and file transfer applications. The administrative entity limits use of the intranet to its authorized users. Most commonly, an intranet is the internal LAN of an organization. A large intranet typically has at least one web server to provide users with organizational information. An intranet is also anything behind the router on a local area network.

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A network interface controller (NIC) is computer hardware that provides a computer with the ability to access the transmission media, and has the ability to process low-level network information. For example, the NIC may have a connector for accepting a cable, or an aerial for wireless transmission and reception, and the associated circuitry.

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A computer network or data network is a telecommunications network which allows computers to exchange data. In computer networks, networked computing devices exchange data with each other using a data link. The connections between nodes are established using either cable media or wireless media. The best-known computer network is the Internet.

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How DNS translates domain names to IP addresses

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dynamic host configuration protocol (internet protocol)

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Automatic IP Address Assignment: How DHCP Works

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Explains the concept of DHCP, an application-layer protocol that your own computer probably uses to get an IP address from your network. Here's a list of the sections in this video and their time codes: 00:14 - A world without DHCP 01:26 - DHCP to the rescue 02:15 - The four-step process My DHCP video was originally uploaded on September 7th 2013, but I made a new version after an attentive viewer pointed out some inaccuracies.

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Hub, Switch or Router? Network Devices Explained

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How Packet Travels in Network ( 3D Animation )

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See how packet travels in a network, How Router works and how switch works. How proxy server works, How firewall works. This video will help you in learning about Computer Networks. Original Website here: www.warriorsofthe.net

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The File Server stores the file, the client device accesses the file with client software such as Windows Explorer.

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The Web Server runs server software and clients use their browser software, such as Windows Internet Explorer, to access web pages on the server.

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The Email Server runs server software and clients use their mail client software, such as Microsoft Outlook, to access Email on the server.