Wide Area Network Technologies - Design and Implement High-quality WAN Networks
Edraw Network Diagram is ideal for network engineers and network designers who need to draw wide area network diagrams.
Wide Area Network Technologies Overview
A Wide Area Network ( WAN) is a computer network
covering multiple distance areas, which may spread across the entire world. WANs
often connect multiple smaller networks, such as local area networks (LANs) or
metro area networks (MANs). The world's most popular WAN is the Internet. Some
segments of the Internet are also WANs in themselves. The key difference between
WAN and LAN technologies is scalability. C WAN must be able to grow as needed to
cover multiple cities, even countries and continents.
A set of switches and routers are interconnected to form
a Wide Area Network. The switches can be connected in different topologies such
as full mesh and half mesh. A wide area network may be privately owned or rented
from a service provider, but the term usually connotes the inclusion of public
(shared user) networks.
Both packet switching and circuit switching technologies
are used in the WAN. Packet switching allows users to share common carrier
resources so that the carrier can make more efficient use of its infrastructure.
In a packet switching setup, networks have connections into the carrier's
network, and many customers share the carrier's network. The carrier can then
create virtual circuits between customers' sites by which packets of data are
delivered from one to the other through the network.
Circuit Switching allows data connections to be
established when needed and then terminated when communication is complete. This
works like a normal telephone line works for voice communication. Integrated
Services Digital Network (ISDN) is a good example of circuit switching. When a
router has data for a remote site, the switched circuit is initiated with the
circuit number of the remote network.
WAN Diagram Software
Edraw Network Diagram is ideal for network engineers and network
designers who need to draw wan diagrams. It had defined some commonly used WAN
symbols in drawing WAN diagrams. Just drag and drop pre-drawn shapes
representing computers and network devices. Double click and set equipment data.
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Examples of Wide
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Virtual private network (VPN) is a technology widely used
in a public switched network (PSTN) to provide private and secured WAN for an
organization. VPN uses encryption and other techniques to make it appear that
the organization has a dedicated network, while making use of the shared
infrastructure of the WAN.
WAN technologies generally function at the lower three
layers of the OSI reference model: the physical layer, the data link layer, and
the network layer. Key technologies often found in WANs include SONET, Frame
Relay, X.25, ATM and PPP.
- ATM: A dedicated-connection switching technology
that organizes digital data into 53-byte cell units. Individually, a cell is
processed asynchronously relative to other related cells and is queued
before being multiplexed over the transmission path. Speeds on ATM networks
can reach 10 Gbps.
- Frame Relay: (FR). A high-speed packet-switched
data communications service, similar to X.25. Frame relay is widely used for
LAN-to-LAN interconnect services, and is well suited to the bursty demands
of LAN environments.
- SONET/SDH: Synchronous Optical Network is an
international standard for high speed communication over fiber-optic
networks. The SONET establishes Optical Carrier (OC) levels from 51.8 Mbps
to 10 Gbps (OC-192) or even higher. Synchronous Digital Hierarchy (SDH) is a
European equivalent of SONET.
- X.25: The X.25 protocol allows computers on
different public networks to communicate through an intermediary computer at
the network layer level.
- PPP: A point-to-point link provides a
single, pre-established WAN communications path from the customer premises
through a carrier network, such as a telephone company, to a remote network.
Point-to-point lines are usually leased from a carrier and thus are often
called leased lines. For a point-to-point line, the carrier allocates pairs
of wire and facility hardware to your line only.
IP can also be considered as a WAN technology in the
packet switching environment.
Symbols of Network Architecture
Some network mapping symbols for network engineer.
Provide a Common Graphics Technology for Network Mapping.
You can find more symbols for WAN diagrams
Some examples of Wide Area Network
WAN Diagrams Software
Local Area Network