Network

Network is what we all are using now a day. Basically it is a network of computers this can be in Office, Home or global. Such as Internet or World Wide Web is a Network of million of Computers.

A computer network is a group of computers that shares information across wireless or wired technology. Computer networks used to only be available for corporations but they are affordable for small businesses and individuals. Computer networking requires two computers, a protocol and the hardware to connect them

Ethernet is a physical and data link layer technology for local area networks (LANs). Ethernet was invented by engineer Robert Metcalfe.

When first widely deployed in the 1980s, Ethernet supported a maximum theoretical data rate of 10 megabits per second (Mbps). Later, so-called "Fast Ethernet" standards increased this maximum data rate to 100 Mbps. Gigabit Ethernet technology further extends peak performance up to 1000 Mbps, and 10 Gigabit Ethernet technology also exists.


Higher level network protocols like Internet Protocol (IP) use Ethernet as their transmission medium. Data travels over Ethernet inside protocol units called frames.

The run length of individual Ethernet cables is limited to roughly 100 meters, but Ethernet networks can be easily extended to link entire schools or office buildings using network bridge devices.

• • Router
  • Network Card
  • Server
  • Client
  
  

  The ISO Model

  The International Organization for Standardization (ISO) has created a Reference Model of Open System Interconnection consisting of seven layers to describe networked systems. 
  
  
  
  
  

  Layer 7	Application	Message Passing
  Layer 6	Presentation	Encoding
  Layer 5	Session	Authentication & Encryption
  Layer 4	Transport	Streams & Segments
  Layer 3	Network	Datagrams
  Layer 2	Data Link	Frames & Packets
  Layer 1	Physical Hardware	Signaling & Wiring