What do intranet and extranet mean?

Question 1: The difference between the internal network and the external network. The internal network is the abbreviation of the local area network (LAN) and can also be called a private network. The external network is the abbreviation of the wide area network (WAN) and can also be called the public network.

LAN refers to a network within a range, such as a company's own internal network. WAN is the Internet network, which can realize global interconnection.

To identify whether a certain machine is in the external network or the internal network relative to you on the network, you mainly need to look at the other party's IP. If the other party is on the same intranet as you, the other party will use the private IP. If the other party is on the external network, the other party will use the public IP.

IANA (Internet Address Assignment Association) has forcibly stipulated several intranet IPs

divided into three categories,

Category A 10.*.*.* The subnet mask is 255.0.0.0

Class B 172.16.*.* The subnet mask is 255.255.0.0

Class C 192.168.0.* The subnet mask is 255.255 .255.0

Except for IPs above 127.0.0.1 and 224, the others are public IPs.

You can tell which one is the public network and which one is the private network.

Question 2: The difference between the internal network and the external network. The internal network refers to the internal LAN. All the computers in your unit are on the same intranet, so of course they can access each other.

When you are at home, you don’t mean surfing the Internet. To be precise, that is called the Internet. The Internet is a network that connects intranets together (including metropolitan area networks, corporate intranets, etc.). But here we need to consider whether your unit’s intranet has access to the Internet? Only if you have a message, you can access your unit's computer.

Question 3: What does intranet, external network, and local area network mean? Differences and connections. Intranet is a local area network. Internet cafes, campus networks, and office networks all fall into this category. In addition, although fiber-to-the-building, residential broadband, education network, and cable TV Cable Modem Internet access have a relatively large geographical scope, they are essentially based on Ethernet technology, so they are still intranets. External network: Internet. China Unicom, China Telecom, China Mobile, etc. have all exceeded the coverage of LAN and should be regarded as external networks. The key to distinguishing between an external network and an internal network is whether it is connected to the wider outside world. This is the concept they are talking about, world wide web. It is worldwide interconnection. No matter what broadband you use, as long as you are connected to the Internet and can communicate with the outside world (worldwide, except for legal provisions), it is the external network. The external network is different from the internal network. The external network can have millions of computers, while the internal network will basically not exceed 5,000 computers.

Question 4: What is the meaning of external network and intranet? The external network is the Internet. For example, the one you are on Baidu now is the external network.

The internal network is composed by a company or an individual. The intranet system is mainly used for office work and *** sharing!

Generally, we call the external network the Internet

We call the internal network the local area network

Question 5: What is the difference between the internal network and the external network? What is the meaning of using the two? , the internal network is actually the internal LAN, the external network is opposite to the internal network, and the network other than the LAN is the Internet in the conventional sense.

The intranet can only be accessed by internal users, while the external network can be accessed by any user

Question 6: What do internal and external networks mean? External network:

WAN (Wide Area Network) is also called long haul network (long haul network). It usually spans a large physical range, covering a range from tens to thousands of kilometers. It can connect multiple cities or countries, or span several continents and provide long-distance communications, forming an international long-distance network. .

Intranet:

Local Area Network (LAN) refers to a computer group composed of multiple computers interconnected in a certain area. Generally within a radius of several kilometers. The LAN can realize functions such as file management, application software sharing, printer sharing, scheduling within work groups, email and fax communication services, etc. A local area network is closed and can consist of two computers in an office or thousands of computers in a company.

Question 7: What do the internal network and the external network mean? Many broadband users are not sure whether they belong to the internal network or the external network, so they blindly perform port mapping before using BT and other software to download. Waiting for the operation will get twice the result with half the effort. First, let’s correct a common misconception. We often hear statements such as "such-and-such ADSL is an internal network" or "such-and-such ADSL is an external network". This statement itself is wrong. Because "ADSL broadband" is just a form of service provided by broadband operators, it is just a technology and a business, and there is no concept of an internal network or an external network. What we refer to as internal network or external network actually refers to whether the current network location of the computer of the end user using this ADSL broadband service belongs to the internal network or the external network. Or in other words, whether the end customer's computer is an internal network or an external network depends entirely on how he uses broadband services such as ADSL, and has nothing to do with which form of broadband he uses. I will give my conclusion first, and then conduct a detailed analysis: 1. The first situation: users who use Telecom ADSL, if there is only one user and one computer using this broadband, the routing function is not used, but the dial-up software is used. Direct dial-up access to the Internet. In this case, the network the user is currently on is the external network; or to put it more simply, if the telecommunications bureau sends someone to install ADSL and nothing is changed, the computer belongs to the external network at this time. ; 2. The second situation: For users who use China Telecom's ADSL, if the routing function is set up in the ADSL modem and multiple users use the same ADSL line to access the Internet, each computer will belong to the intranet at this time; 3 , introduce a relatively special form of broadband: the intranet within the intranet; Before the specific analysis, first explain the judgment criteria for the intranet and the external network: (quoted from the help information of BitComet) 1. One of the judgment criteria: 0.50 or In the "Global Statistics" of the above version of BitComet, the external IP is the public IP and the internal IP is the internal IP. If these two values ????are the same, then you are a public network user, otherwise you are an internal network user. Of course, intranet users can obtain exactly the same effect as the public network through port mapping. 2. Judgment criterion two: Use "Advanced connection information" in MSN Messenger "Tools-gt; Options-gt; Connection" (Note: MSN Messenger is used here, not Windows Messenger. Windows Messenger advanced connection information is the same as MSN Messenger are different). Advanced connection information consists of the following types: "Direct connection" means that the user is on the public network, does not use the Internet Connection Firewall (ICF) that comes with Windows XP, and does not need to use UPnP. However, this situation does not exclude the user from installing third-party network firewall software, such as Norton Internet Security 2002/2003/2004 series, the famous domestic Skynet firewall, etc. When such users use BT, as long as the port monitored by the BT software is not blocked by the ISP, they can generally achieve the best speed without any settings. Users who have installed a third-party network firewall should make sure that the firewall allows the BT software to listen on the required ports. "Direct connection, using Internet Connection Firewall (ICF)" means that the user is on the public network and uses the Internet Connection Firewall (ICF) that comes with Windows XP. It does not necessarily require the use of UPnP.

If such users want to get the best download speed from BT, they can manually open the corresponding listening port for the BT software in the advanced settings of ICF, or they can turn on BitComet's "Allow opening of Windows network sharing and firewall ICS/ICF ports" ”, click OK on the dialog box that prompts that the network connection protection settings are about to be changed the next time Bitet starts, and let BitComet operate automatically. "Universal Plug and Play (UPnP) Network Address Translation (NAT)" means that the user is on an intranet and accesses the Internet through a gateway or router. The NAT supported by the gateway or router supports UPnP (and is turned on. Currently, the gateway software that supports UPnP is Windows XP ICS, KERIO's WinRoute Firewall 5 series).

If these users want to get the best download speed from BT, it is best to use BT software that supports UPnP, such as Bit...gt;gt;

Question 8: External network and internal network , what does it mean and what is the difference? The external network can access the Internet

The internal network is the office LAN for mutual access and is not connected to the external network

Question 9: What does the internal network and external network mean? To put it simply, there is a local area network inside our work or home or community, and there is a network with a wide coverage outside our work or home, such as the Internet. This large network extends to our work, home (through optical fiber, network cable, telephone line, etc. ). We connect our LAN to the internet. Then our access scope expands from the LAN to the entire internet. At this time, it is said that the LAN is the internal network and the internet is the external network.

Same thing. If your unit's LAN is very large, and the small LAN composed of several computers in your office is connected to the entire unit's large LAN, then it can also be said that the unit's large LAN is the external network and the small LAN in the office is the internal network. .At the same time, if the unit's large LAN is connected to the Internet, then relative to the Internet, it can also be said that the unit's large LAN is an intranet.

The intranet may be an independent LAN. Through the gateway (gateway) It is a node that connects two networks. To put it bluntly, it is a computer with dual identities. It has both the IP address of the LAN and the IP address of the Internet. The two IP addresses are tied to different network cards) and the proxy accesses the external network. For example, Internet cafes are implemented in this way. The characteristic is: the IPs of the computers in the Internet cafes are all LAN-specific IPs. For example, 192.168.xxx.xxx or 10.xxx.xxx.xxx. This kind of IP will not appear on the Internet.

(Note: The so-called agent means that when you make a request, he will do the work. It is similar to purchasing train tickets. If a computer in the LAN wants to communicate with the outside world, it will tell the other party's address to the server, which is also the gateway. Gateway Contact the other party as your own identity. At the same time, forward the message sent back by the other party to the computer in the LAN. Therefore, the other party cannot see the IP of the computer in the LAN. They will only think that the computer at the gateway is communicating with you. All the people in the Internet cafe QQ all shows the same IP. Can you understand why now?)

The internal network may also be a part of the external network. For example, the campus network. Or the office internal LAN relative to the unit LAN. Its characteristics Yes: The IP of the intranet computer is part of the entire external network IP range. The intranet computer is connected to the external network through the gateway (router). The gateway does not need to provide proxy services. Direct routing is enough.

( Note: The so-called routing means path selection. The router connects multiple networks. Therefore, it must be the gateway of each network. Its function is similar to the post office. If you want to contact a computer outside the LAN, just send the mail package to the router. The router will help you deliver it to The address marked on the parcel. In this way, the person who receives the parcel can know who sent the parcel. However, he cannot know whether the person who sent the parcel is sending the parcel on behalf of others. In other words, the computer that received the data can It knows which computer is contacting it. But it has no way of knowing whether the computer it is contacting is a proxy server of a certain LAN.)

adsl is special. It has two working methods. The first An adsl modem turns on the proxy function. At this time, the modem can actually be regarded as a computer. It is a node of the internet (external network). At the same time, it is connected to your computer to form a local area network, which is an intranet. The intranet gateway is the modem. The second type is dial-up Internet access through the computer. In this case, the modem is an external device of the computer. And your computer is directly connected to the Internet through the phone line. There are no other networks. Therefore, It doesn’t matter whether it is an internal network or an external network.

Answer 2: What is a wide area network (WAN. Public network. External network).

What is a local area network (LAN, private network, intranet)?

Wide area network (WAN). It is what we usually call the Internet. It is a network all over the world.

Local area network (LAN). Compared with wide area network (WAN), it mainly refers to a computer interconnection network within a small range. This [small range can be a family, a school, a company, or a *** department.

Public network and external network are often mentioned in BT, that is, wide area network (WAN), and private network and intranet are often mentioned in BT, that is, local area network (LAN).

WAN Each computer (or other network device) has one or more WAN IP addresses (or public network, external network IP addresses). WAN IP addresses generally need to be paid to the ISP before you can apply for them. WAN IP addresses Cannot be repeated, every computer (or other...gt;gt;