Computer network ccna course related

Computer network explained

 

A computer network is a telecommunications network that enables sharing of resources and information. Nodes in a network are connected with each other using either cable or  wireless media and use a system of digital rules for data exchange.

Data is transferred in the form of a packet, a formatted unit of data.



When you are browsing the Internet, your computer is a part of the biggest network in the world – the Internet. If yohave access to the Internet at home, your devices  are part of a LAN (Local Area Network). Here is how a simple LAN looks like:

 

In the picture above you can see that the computer is connected to the router which is then connencted to the Internet. The computr can send and receive data on the Internet using Internet protocols such as HTTP and DNS.

To connect two computers together, we would use a device called aswitch. Switches serve as a central point to which all computers on a network connect to:

 

IEEE 802 Standards

The IEEE 802 Standrds comprses a family of networking standards that cover the 
physical layer specifications of technologies. The following tables show the most popular IEEE 802 Standards.
Standard

Description

802.1
Internetworking
802.2
Logical link control
802.3
Ethernet
802.4
Token bus
802.5
Token ring
802.6
Metropolitan area network (MAN)
802.7
Broadband technology
802.8
Fiber-optic technology
802.9
Voice and data integration
802.10
Network security
802.11
Wireless networking
802.12
Demand priority networking

 

Ethernet Standards

Standard
Description
802.3
Ethernet CSMA /CD (10 Mbps)
802.3u
Fast Ethernet (100 Mbps)
802.3z


Gigabit Ethernet over fiber-optic cabling or coaxial cabling
802.3ab
Gigabit Ethernet over twisted-pair cabling
802.3ae

10-Gigabit Ethernet

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