What is a public network The scope of intranet, public and private networks

What do you have to look at the definition of intranet and public net?

From the perspective of individuals and the Internet, the intranet is the local area network, and the public network is the Internet.

From the perspective of the structure of the world's Internet, the intranet is the Chinese Internet, and the public network is the result of the interconnection of the intranets of all countries.

The other is like a region, a large company collective, or a university campus, they all have a local area network, also called an intranet.

Finally, the intranet is the internal network of an individual (regardless of whether the intranet can be connected to the public network), which is called the intranet. The public network is a large collective network with a large number of people. The Internet network is. Public network.

1.If the simple intranet is not connected to Intel is the intranet, the intranet is your own local area network, for example, if you set up more than 2 PCs at home or in the company, you can call the local area network, it should not be called an Internet café, the current Internet cafes are all public IP addresses, how can it be an intranet, I don't agree with the statement upstairs, I think what he said is a bit contradictory.

2.The so-called public network is that as long as you connect to Intel, it is called the public network, no matter what way you dial up or broadband, others can connect to you through your port, how can you be an intranet.

The user who goes to the Internet through the LAN of the Internet café is the intranet, and the user who goes to the Internet at ordinary homes is the public network, and the public network is more dangerous because it is directly connected to the Internet! ~~

Class A: Address range, which is mainly assigned to large networks with a large number of hosts and a small number of LANs;

Category B: The address range is to, which is generally used by large international companies and ** institutions;

Category C: The address range is to, which is the campus network of general small companies.

research institutes; Category D: Address range from to.

Category E: The address range is to and is temporarily reserved.

IP address. It is divided into 5 categories, of which A, B, and C reserve 3 regions as private network addresses.

It is for Chi Doran. VPC addresses cannot appear on public networks, but can only be used on internal networks. All routers cannot send datagrams with a private network address as the destination address.

The Internet is the Public Network. The differences between the intranet and the public network are as follows:

1.IP addresses are different.

The IP address obtained from the public computer is a non-reserved address on the Internet. Computers on the public network and other computers on the Internet can access each other at will.

2.Access is different.

The external network is a network that can access the Internet without a router or switch, and can be directly accessed by the outside world, without the need for equipment, directly connected to the computer.

3.The defense is different.

Compared with the external network, the internal network will have an extra layer of security firewall (external network routing) to resist the attack ability from the external leakage and dismantling of the network.

The disadvantage of the intranet is that it can be attacked from within; Because of the shared bandwidth, the relative network speed may be slower, and the more terminals, the slower.

4.The type of network is different.

An intranet is a local area network, which refers to a group of computers interconnected by multiple computers in a certain area. A LAN is closed and can consist of two computers in an office or thousands of computers in a company.

The extranet is the wide area network, which is a remote network that connects the computer communication of the local area network or metropolitan area network in different regions. It usually spans a large physical range and covers a large area, forming an international long-distance network.

5.The access methods are different.

Computers on the intranet access the Internet through a public gateway using the NAT (Network Address Translation) protocol. The state clearly stipulates that the internal network and the external network are physically isolated, and the external network and the Internet are logically isolated.

Computers on the intranet can send connection requests to other computers on the Internet; Other computers on the Internet cannot send connection requests to computers on the intranet.

1. Intranet: also known as local area network (LAN), is a computer communication network composed of various computers, external equipment and databases connected to each other within a local geographical range (such as a school, factory and institution) within a radius of several kilometers.

2. Public network: The public network is relative to the internal network. The IP address obtained by the computer on the intranet is the reserved address on the Internet; The IP address obtained by the computer on the Internet is the public address of the Internet, and it is a stupid and non-reserved address.

Computers on the public network and other computers on the Internet can access each other at will.

3. Extranet: Wide Area Network (English: Wide Area Network, abbreviated as WAN), also known as Wide Area Network and Extranet.

It is a remote network that connects computer communication in different regions, either a local area network or a metropolitan area network. It usually spans a large physical range, covering a range of tens of kilometers to thousands of kilometers, and it can connect multiple regions, cities and countries, or across several continents and can provide long-distance communication with vibrillation, forming an international long-distance network.

Intranet refers to a private network that is limited to a specific scope, usually owned and controlled by an individual, organization or enterprise. Intranet devices are connected together via a LAN and communicate using a private IP address range, such as or. Intranet devices cannot be directly accessed from the public internet, and their communications are protected by security mechanisms such as firewalls to ensure the security and privacy of the network.

The public network refers to the wide area network, which is an Internet covering the whole world, which is composed of multiple types of Sentan networks and network devices. The public network allows different networks to connect and communicate with each other, allowing users to access resources and services on the Internet from anywhere. Public IP addresses are used on the public network, which are assigned and managed by ISPs.

Devices on the public network can communicate on the Internet through various protocols and services, such as HTTP, FTP, SSH, etc.