Local area network - LAN: Introduce WAN network - Part V

Introduction to WAN In this article we will introduce different protocols and technologies used in wide area networks - WAN. Topics include point-to-point connection, switching - circuit switching, packet switching - what is packet switching, circuit o, and devices used in WAN WAN?

WAN is a long-distance data transmission network on a large geographic area and uses the facilities and services of providers of telephone companies. WAN technology is also located in the three lower layers of the OSI model: the physical layer, the data link layer, and the network layer. The figure illustrates the link between WAN and OSI model. . Point-to-point connection Point-to-point connection provides customers with a WAN connection to a remote network through the service provider's network. Point-to-point connection:

Also known as leased lines because it establishes a fixed connection for customers to remote networks through the convenience of the service provider. Service providers have stock links available for their own purposes. These connections are suitable for two modes of data transfer: - Data transfer - Datagram transmissions: Data transfer where data frames are addressed separately. Data-stream transmissions: Transfer a data stream where the address is only checked once. Switching - Circuit switching

Switching is a method that uses physical switches to establish, maintain, and end a session through the service provider's network of a WAN connection. Switching is suitable for two data transmission modes: Data transfer - Datagram transmissions and Data transmission - Data-transmission transmission. Widely used in telephone companies, switching works almost like a regular phone call. Packet Switching - Packet Switching

Switching is a WAN switching method, in which network devices share a point-to-point connection to transmit a packet from ni to the receiver via the service provider's network. Multiplexing techniques are used to allow devices to share connections. ATM (Asynchronous Transfer Mode: Asynchronous Transfer). Frame relay, SMDS-Switched Multimegabit Data Service, X.25 are examples of packet switching technology. Virtual Circuits A circuit is a logic circuit that is designed to compensate for the reliability of communication between two network devices. The circuit o has 2 types: Switched virtual circuit (SVC) and fixed circuit (permanent virtual circui - PVC) SVC is a circuit that is automatically set when required and ends when the transmission Data is completed. Communication through an SVC consists of three parts: Establishing a connection, transferring data, disconnecting. The connection establishment is responsible for establishing an o circuit between two transmitters and receivers. The data transmission part is responsible for transmitting data between devices through the established circuit and the end of the connection is responsible for canceling the circuit o. SVC is used in case the data transmission is intermittent and irregular because SVC increases the bandwidth used when setting up and disconnecting but reducing the cost compared to the continuous connection network. . PVC is a fixed and continuous circuit and only one mode is data transfer. PVC is used in case of continuous and steady data transmission. PVC tape bandwidth used due to non-set up and disconnection but increased cost due to continuous network connection. Network device used in WAN - WAN Devices WAN switch

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