My Netwok Dictionary

It is considered that the WAN is a data set of links connecting the routers on a LAN. The end user workstations and servers on the LAN exchange data. Routers transmit data between networks through data links.

Due to the costs and legal reasons, a provider of communications or a common communications company generally owns the data links that make up a WAN. Links are available to subscribers for a fee and are used to interconnect LANs or connect remote networks. The speed of data transmission over a WAN (wide band) is much less than 100 Mbps, which is common in a LAN.

The costs of providing bond are the most expensive element of the WAN and the design should seek to provide maximum bandwidth at an acceptable cost. With the pressure from users to gain greater access to the service at higher speeds and pressure from administrators to contain costs, to determine the optimal configuration of WAN is not an easy task. Read the rest of this entry »

For long distance communications, the WAN use serial transmission. This is a process by which bits of data sent over a single channel. This process provides long distance communication and reliable use of a specific range of optical or electromagnetic frequencies.

The frequencies are measured in terms of cycles per second expressed in hertz (Hz). The signals transmitted over telephone lines using voice-grade 4 kilohertz (kHz). The size range is often called bandwidth. In networking, the bandwidth is the measure of bits per second transmitted. Read the rest of this entry »

WANs are LANs connected with groups of communication links from a service provider. As communication links can not connect directly to the LAN, you should identify the various pieces of equipment that performs the interfaces.

LAN-based computers to transmit data, send data to a router that has both LAN and WAN interfaces. The router uses information from Layer 3 address to send data to the appropriate WAN interface. Routers are active and intelligent network devices and therefore may participate in the administration of a network. Routers manage network providing dynamic control over resources and supporting tasks and objectives of the networks. Some of these objectives are: connectivity, reliable performance, management control and flexibility. Read the rest of this entry »