Network partition notes

Network partition description

Division of mobile communication network ： Access network 、 Bearer network 、 Core network .

The bearing network consists of ： Metropolitan area network + backbone network .（ In other words, the bearing network is composed of ： Access layer 、 Convergence layer 、 Core layer 、 Backbone layer .）

Composition of man ： Access layer 、 Convergence layer 、 Core layer . Backbone network composition ： Provincial backbone network 、 National backbone network .

The connection between the bearer network and the core network is the core layer , Connecting with the access network is the access layer .（ The access network will not be so layered , Because only the base station is involved , The core network will not ）

computer network By coverage Can be divided into LAN , Metropolitan area network , Wide area network

LAN ：

The geographical distribution range is small （ Generally hundreds of meters to several kilometers . It can cover a building 、 A campus or an enterprise 、 A family ）

High data transmission rate （ It's usually 100Mbps, At present, the rate has reached 1000Mbps LAN ）

Metropolitan area network ：

Metropolitan area network is also called metropolitan area network （Metropolitan Area Network,MAN） A large computer network ,MAN It's improvement LAN（ LAN ） Transmission medium in , Expand the scope of LAN .

Larger LAN , The cost is high , But it can provide faster transmission rate .

The geographical distribution range is large , It usually ranges from tens of kilometers to hundreds of kilometers . It can cover one city , A metropolitan area .

It's a broadband LAN , Its transmission medium is mainly optical cable , The transmission rate is 100 Megabits / More than seconds .

MAN An important use of is as a backbone network , Through it will be located in the same city in different locations of the host 、 database , as well as LAN Wait for the connection

backbone network （Backbone Network） It is a high-speed network used to connect multiple regions or regions . Each backbone network has at least one connection point for interconnection with other backbone networks . Different network providers have their own backbone networks , It is used to connect the networks located in different regions .

Wide area network ：

When the distance connected by the hub is exceeded in an area , It has to be Connect through a router , This type of network is called Wan . If there is a North 、 in 、 South Branch , Even overseas branches , Connect these branches by special line , That is called “ Wide area network ”.

Wide area network coverage ： Hundreds to thousands of kilometers .

The transmission medium of Wan mainly uses telephone line or optical fiber , from ISP Operators will connect enterprises , These lines are ISP The operator is buried in the road in advance 、 lake bottom , Submarine route , Because the project is huge , Maintenance is not easy , And the bandwidth can be guaranteed , So it will be more expensive in cost .

The Internet （Internet）

Internet , The Internet （Internet）, It is the largest computer Internet in the world , It is a global network of computers that communicate with each other in a common language , Once you connect to any of its nodes , It means that your computer has been connected to Internet network .Internet Current users are all over the world , There are more than hundreds of millions of people , And the number of its users is still rising in an equal proportion .
 

Three layer network structure

Access layer 、 Convergence layer 、 The three levels of the core layer focus on some specific functions ： The core layer is mainly used for the high-speed switching backbone of the network , The convergence layer focuses on providing policy based connectivity , The access layer is responsible for including computers ,AP And other workstations are connected to the network . Such a design can divide a complex large and comprehensive network into three levels for orderly management .

Core layer —— Provide optimal transmission ;

Convergence layer —— Provide policy based connectivity ;

Access layer —— Provide user access to the network for multi service applications and other network applications .

But here's the thing , Access layer 、 The convergence layer and the core layer are not the attribute classification of the switch itself , It is the division of the position in the network structure .