Ask IP questions about 100 of network blindness

Question 1 According to my experience, this IP is the IP address generated by home ADSL dial-up. Because there are three connections that are very close. The Internet café is an intranet, because a cable with many machines, if the IP is very fixed in the Internet café, the same is also an intranet in the company.

The same IP will be displayed

Question 2Why is there a one that starts with 221? Everything else is a two-digit number starting with 6?

Two reasons:1Often, there won't be only one ADSL server in the city.

For example, China Telecom. There are a number of servers available that allow you to adsl the connection. Therefore, the IP assigned by different servers is not necessarily the same, and it can vary greatly.

But if it's connected to the same server. Then the only difference is a very smile. Such as the difference between the last two IP addresses 2

Probably he uses a server. From what you said, this is unlikely.

3.Didn't say anything. It can only be said that it is very likely that the same person did it. He's ADSL Dialer! The server automatically assigns an IP address.

To tell you a judgment experience, you look at the time of his speech, if the interval between the two speeches is only a few minutes, and the IP address is almost the same, then he is definitely ADSL dial-up Internet. Right at home.

You can get to:

Check it out.

Probably an internet café on an internet café!

If you are the Lord, you can see the last one.

It should be at home... ADSL Internet access. ADSL Internet access. IP is active. It is also possible to get Internet access through route sharing. It should be the same person.

IP is a protocol for interconnection between networks", that is, a protocol designed for computer networks to communicate with each other.

An IP address is a logical address of a computer that doesn't actually exist, it's just artificially defined. It can be changed, but in a local area network, it must be an unused and in the same network, otherwise, in the local area network, you will not be able to communicate with others. For the IP address of the public network, you generally can't change it casually, because the operator assigns it to you, and if you change it, you can't access the Internet.

An IP address is equivalent to your home address, and an IP address is automatically assigned to your computer when you surf the Internet. It's just that our address is represented by words, while the address of a computer is represented by binary numbers. The length of the IP address is 32 bits, divided into 4 segments of 8 bits each, expressed in decimal numbers, each segment with a numerical range of 0 255, separated by periods.

To know more details, google it.

Friend, the computer IP address refers to the portal of a computer, which can also be understood as the location of the ground, each computer has its own IP address, just like your home address, the IP address of a computer cannot be modified in any case, but you can use some software to do **, just like you hired a lawyer, you have something to do with him, and I have nothing to do. The IP address of the computer is not necessary for the average Internet user to thoroughly understand its very subtle meaning, just like a fisherman, what you need is to catch more fish and find more fun on the Internet, not to study how to build a ship!

To give you a simple explanation. You treat the computer as a person, the IP is his ID card, the number on the IP is his ID number, you want to find a job, take a plane, etc., you need an ID card, which is equivalent to the computer to be connected to the Internet, you must have IP, if you don't connect to the Internet, you don't use IP, just like you are at home, you can do whatever you want. No one came to check an ID card

Computer IP, according to my understanding, is the proof that the network provider gives users access to the Internet! I don't know if you understand!

IP is the abbreviation of Internet Protocol (protocol for interconnection between networks), Chinese referred to as "network association", that is, a protocol designed for computer networks to connect to each other for communication. In the Internet, it is a set of rules that enable all computer networks connected to the Internet to communicate with each other, and prescribe the rules that computers should follow when communicating on the Internet. Any computer system manufactured by any manufacturer can be interconnected with the Internet as long as it complies with the IP protocol.

IP addresses are unique and can be divided into 5 categories depending on the nature of the user. In addition, IP also has the meaning of entry protection, intellectual property, pointer registers, etc.

Clarification The architecture of the campus network should look like this.

The ISP (operator providing network services) provides the school with a network cable connected to the external network, which is connected to the school's gateway (the entrance and exit of the entire campus network and the external network) (maybe there is a hardware firewall in front of it, I just briefly talk about the network architecture) Most of the gateways are routers, advanced points, routers have automatic connection functions, and the router is connected to the switch under the switch, and the switch is connected to your computer.

So your computer is going through-switch-router-(firewall)-internet switch will generally assign you an IP (DHCP) and DNS (Domain Name Resolution Server) address.

That's it, except that the network structure is multi-layered, and you don't have to dial it yourself.

Since it is a campus network, it is a relatively independent and closed network, and it is a complete network. Of course there are exits and entrances to the outside world. Routers are used to separate network segments and control access. Of course, you don't know the difference between a cat and a router just yet.

There is no need to have a cat in the campus network, and you can access the Internet directly by plugging in the network cable.

Comrade, you really read it wrong. I read your question, and I specifically checked the standard RFC documents abroad. Class D address is from 224 239 with absolutely no problems.

The E address is from 240 247 instead of 255It's also specified in the RFC documentation. 247 255 has other uses (I didn't understand much because it was in English).

Class D addresses are used as multicast addresses, and Class E addresses are reserved addresses. We only use Class C addresses on a day-to-day basis.

If you have to think you're right, tell me you're ** seeming. If it was in that textbook, I can tell you for sure that the book is wrong.

Class D addresses.

A Class D address does not distinguish between network address and host address, and the first four bits of its first byte are fixed at 1110.

Class E addresses. Class E addresses are not divided into network addresses and host addresses, and the first five digits of its first byte are fixed at 11110.

As the saying goes, it is better to believe in countless books Truth is accumulated by a lot of experience Your statement is just a wrong statement of a certain type of book Most of the books are still marked according to the standard The most standard literature can refer to the International Standards Organization documents If the English is not good, believe in the power of netizens.

Class D addresses. A Class D address does not distinguish between network address and host address, and the first four bits of its first byte are fixed at 1110.

There can't be a second answer.

The IP address is determined by your internet service provider.

You can't set anything on her.

You can find your ISP to make changes.

Such as China Telecom is.

It's mine. It's useless if you know.

Well, the upstairs is right. I looked through the textbooks and checked the information, all of which were Class D addresses from 224 239, Class E addresses from 240 247, and 255 were all used as special-purpose addresses.

Where does the saying "but its first byte range be 224-247"?

China is a country with poor IP, network operators only have a certain number of IP, and there are more Internet users, so basically everyone's external IP is not fixed, and the intranet IP is to see the way you assign IP to the upper level of the machine that goes online, whether it is dynamic or static, dynamic, the machine at the bottom is automatically obtained, static, fill in casually, but can not conflict.

If the higher-level router specifies an IP, your IP will not change.

Your problem is ambiguous, and setting up these things will run into all sorts of problems that are known or unknown to you.

You say that your IP will change, and one situation is that the Internet IP will change, which is no way. In the other case, the intranet IP changes, then your machine should automatically obtain the IP. Check your current IP first, and then fill in one... If you don't ask me again.

It's very simple, just use a fixed computer...

It is dial-up to the Internet.

Home networking. It's a dynamic IP, and every time, you'll be randomly assigned an IP address.

Automatically getting an IP can solve your problem, but this method is that the computer is relatively slow when it first starts, if you really want to set it manually, then look at the IPs one by one, or add an IP on the router, you just set the new IP on your computer.

You get it automatically.

If you have to do it manually, you can try it from 2 255 (I think you might be something, find a few to try, 2-255 will do.)

You didn't explain what the fault was, how do we answer, you click on the network neighbor property - local connection property - cancel the "notify me when restricted or no connection" option - application, do you see if it is solved?

Do you use a router to access the Internet or directly connect the cat to the Internet? If you connect to the route, you can directly and automatically get the IP, and if you pick up the cat, you can leave it alone, and it will not affect the Internet.

You've set up an IP address, right? It is recommended to try it automatically.

Pls what is the problem with this question? It is estimated that if you change the IP yourself, you will not be able to access the Internet.