n the switch. Later, an employee e-mailed him and told him he saw a cable lying on the floor and SO plugged it into another port of the same switch. Virtual Local Area Networks for Specialized Treatment A Virtual Local Area Network (VLAN) comprises devices such as personal computers, physical servers, IP phones, and wireless telephones whose addresses are programmed as a group in Layer 2 switches to give them higher priority or special privileges, or to segregate them from the rest of the corporate network for higher security. Although they are programmed as a separate LAN and treated like a separate LAN in terms of privileges, they are not necessarily connected to the same switches. Some computers are put into VLANs SO that they can access secure files such as healthcare records. VLANs are used to provide special features to nodes. For example, video conferencing or LAN-connected telephones may receive priority over e-mail traffic www.TechnicalPDF.com because delays in video may result in distorted images whereas e-mails are not time sensitive and delays in sending or receiving messages are not noticeable. IP telephones and video conferencing units that send voice in packets over networks and wireless LAN devices are often programmed into their own VLANs. These devices allow only certain types of equipment, such as other telephones or video conferencing equipment, to communicate with them. Media-Connecting Nodes to LANs In information technology and telecommunications, media refers to cabling and wireless services that connect devices to each other, to buildings and ultimately to individuals. Examples of media are: copper, fiber-optic cabling, and wireless on cellular and Wi-Fi networks. Copper is used most often between individual wired computers and the wiring closet on each floor. Fiber is often used to transmit data between floors and within the data center to transport the heavy concentrations of traffic. Because of its light weight and large capacity, fiber is deployed where there is the heaviest amount of