Thursday, 17 December 2020

Advanced network


Advanced network, is a system for linking two or more devices using one of the technologies of communication systems in order to exchange information, resources, and data between them available to the network, such as the printer or application software of any kind, as well as allowing direct communication between users.


Devices such as a computer may be very close to each other, such as being in one room. It can be a network consisting of a group of devices in remote places, such as networks between cities or countries and even continents, and such networks are often connected to the Internet or by satellites.


Imagine the huge amount of disks that we will need to transfer information, in the absence of a network, and how we will exchange information also in the case of a single printer in a site that has more than one terminal, how will that printer be used?


Computer networking standards

The Institute of Electrical and Electronics Engineers (IEEE) developed a set of global standards for local telecommunications networks through a sub-committee named IEEE 802, starting with the names ISO / IEC 8802-1 through ISO / IEC 8802-11.


The acronym IEC represents the initials of the International Electromechanical Commission, an electrical and mechanical standard-issuing body that includes representatives from all countries of the world).


1- IEEE 802.x standards, which include a set of specifications, including:


A- IEEE 802.3 specification for Ethernet networks operating with the CSMA / CD protocol, which deals with linear networks.


B- IEEE 802.4 specification for Token ring protocol dealing with linear networks.


C- IEEE 802.5 specification for Token ring protocol for ring infrastructure networks.


D- IEEE 802.6 specification. This group defines the protocol used in the stations sharing a duplex fiber optic path.


E - IEEE 802.7 This group defines technical guidelines for broadband communications (Cable TV).


And IEEE 802.8, which is the IEEE 802.3 to the IEEE 802.6 Committee Review Committee.


G - IEEE 802.9 This group deals with the integration of voice and data (ISDN) on LANs compatible with n802.x standards.


H- IEEE 802.10 This group deals with security and cryptography in computer networks.


I- IEEE 802.11 This group issues standards for wireless networks that employ radio waves, and those for spread spectrum and infrared rays.


A series of standards was issued from this standard, symbolized by the specification IEEE 802.11x, where x takes the values ​​b, ae, to express the advantages of networks operating according to these standards.


2- Protocol: 

TCP / IP is the Transmission Control Protocol / Internet Protocol, which is a package of very broad protocols and services that work with a huge variety of systems.


This protocol, which was developed in early 1970, is the most popular in the field of computer networks.

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