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LANs Local Area Networks

  • Modeling can be key to capacity planning

    Planning for the future of your network sometimes requires rigorous planning and modeling. In this tip, Ed Tittel shows how a free modeling tool just may come to your rescue. Continue Reading

  • Introduction to IPv6 -- 'IPv6 Security,' Chapter 1

    Learn what the Internet Protocol version 6 (IPv6) is, know who has adopted it, understand the vulnerabilities causing security concerns, and learn methods used to protect networks against hacker attacks and tools. Continue Reading

  • How does a firewall work?

    A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks. An enterprise with an intranet that allows its workers access to the wider Internet ... Continue Reading

  • ping

    Ping is a basic Internet program that allows a user to verify that a particular IP address exists and can accept requests. The verb "ping" means the act of using the ping utility or command. Continue Reading

  • Seebeck effect

    The Seebeck effect describes the generation of electricity following the connection of two dissimilar electrical conductors or semiconductors that illustrates the thermoelectric effect.  Continue Reading

  • WAN technologies summarized

    This excerpt from 'The Shortcut Guide to Optimizing WAN Application Delivery' introduces current and existing WAN environments and technologies. Topics include point-to-point links, circuit and packet switching methodologies, virtual circuits, ...Continue Reading

  • port interface card (PIC)

    A port interface card (PIC) is a computer circuit board that provides multiple, diverse interfaces for connections to external networks. In effect, a PIC is an enhanced network interface card (NIC)... (Continued)Continue Reading

  • Class of Service (CoS)

    Class of Service (CoS) is a way of managing traffic in a network by grouping similar types of traffic (for example, e-mail, streaming video, voice, large document file transfer) together and treating each type as a class with its own level of ...Continue Reading

  • Internet Routing in Space (IRIS)

    Internet Routing in Space in Space, also known as (IRIS), is a project being conducted by the U.S. Department of Defense to place an IP (Internet protocol) router on a geostationary satellite... (Continued)Continue Reading

  • Trouble connecting to the VPN: Static and dynamic IP address issues

    For mobile or remote employees, a corporate VPN promises simple, secure access to privileged data and resources. But when that access fails, troubleshooting VPN connectivity issues can be frustrating for the end user and networking staff alike. In ...Continue Reading

  • phase-change cooling (vapor cooling)

    Phase-change cooling, also called vapor cooling, is a microprocessor-cooling technology that works according to the same principles as a conventional refrigerator, freezer or air conditioner. The principal components of a phase-change cooling system...Continue Reading

  • Best practices for securing your wireless LAN

    Perhaps the biggest network security concern for many enterprises is securing a wireless local area network (WLAN). This three-part expert lesson provides best practices for securing a WLAN in the enterprise. Lesson 1 focuses on methods of ...Continue Reading

  • cognitive radio (CR)

    Cognitive radio (CR) is a form of wireless communication in which a transceiver can intelligently detect which communication channels are in use and which are not, and instantly move into vacant channels while avoiding occupied ones... (Continued)Continue Reading

  • Peltier effect

    The Peltier effect is a temperature difference created by applying a voltage between two electrodes connected to a sample of semiconductor material. This phenomenon can be useful when it is necessary to transfer heat from one medium to another on a ...Continue Reading

  • thermoelectric cooling

    Thermoelectric cooling is a way to remove thermal energy from a medium, device or component by applying a voltage of constant polarity to a junction between dissimilar electrical conductors or semiconductors...(continued)Continue Reading