Classification of networks

By coverage:

Local area Network (LAN)-range: tens of meters to thousands of meters; capacity: several to thousands of computers

Metropolitan area Network (MAN)-contains multiple local area networks

Wide area Network (WAN)-the usual Internet

Divided by topology:

Bus type (how bandwidth is shared)

Ring (single, obsolete)

Star type

Tree type

By transmission media:

A, double line: including straight line, cross line, full reverse line (console line). The effective transmission distance of double glue line is only 100 meters.

B, coaxial cable: high production cost, rarely used at present, TV station cable is still in use.

C, optical fiber: long transmission distance, high speed, strong anti-interference, is an ideal choice.

D, wireless network: microwave, infrared transmission

The connection of the equipment follows the principle of "similar crossover, heterogeneous through".

The scope of use of straight-through lines: PC--- switches (switch), switches (switch)-routers (router)

Range of use of cross lines: PC---PC Switch---Swit h Route---Route

Reverse line: the line that configures a router or switch, usually only 2 meters long.