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  • Saving money with used network hardware: Tricky but doable

    Buying used network hardware is a good way to save some money and to extend the life of your infrastructure, but it's tricky. It can sour your relationships with your key vendors, and finding good support for the equipment is a challenge. But the rig...  Article

  • How to upgrade Windows Server 2003 to Server 2008

    Use these resources recommended by our network administration expert to upgrade from Windows Server 2003 to Windows Server 2008, in this expert response.  Ask the Expert

  • Differences between WLANs, Wi-Fi and WiMax

    Wireless networking expert Lisa Phifer explains the differences between WLAN, WiMax and Wi-Fi and provides an excellent tutorial on what separates Wi-Fi from WLAN.  Ask the Expert

  • 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 s...  Definition

  • Why are patch panels required for cabling networks?

    When cabling networks, you may wonder why it's a requirement to have patch panels and why they aren't connected to switches. This expert response explains why and how they're used in a rack with multiple switches and ports.  Ask the Expert

  • FECN/BECN (forward explicit congestion notification/backward explicit congestion notification)

    In a frame relay network, FECN (forward explicit congestion notification) is a header bit transmitted by the source (sending) terminal requesting that the destination (receiving) terminal slow down its requests for data.  Definition

  • client/server

    Client/server describes the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfills the request.  Definition

  • CSU/DSU (Channel Service Unit/Data Service Unit)

    A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about the size of an external modem that converts a digital data frame from the communications technology used on a local area network (LAN) into a frame appropriate to a wide-ar...  Definition

  • TCP/IP (Transmission Control Protocol/Internet Protocol)

    TCP/IP (Transmission Control Protocol/Internet Protocol) is the basic communication language or protocol of the Internet  Definition

  • Can IP addresses of LANs that make up a WAN be the same?

    Our networking fundamentals expert answers whether the IP addresses of different physical locations (LANs) making up a WAN can be the same address. Find out if networks with the same IP address will overlap and create routing problems, in this expert...  Ask the Expert

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