Questions about IP addresses!! 20

How to solve the problem that the IP address of the computer is wrong and the network cannot be connected.

Hit ipconfig in the command line window and press enter, see what your local IP address is, it's best to send it privately, I'm afraid that some other brain-dead will come to attack maliciously.

The address that starts with 192 is the internal network address, and the other numbers start with the external address of the telecom, which will change randomly. It's different every time it's dialed.

There are too many questions to answer in one or two sentences.

In fact, there are only more than 3 billion public IPs in the world, and there are far more computers than that, why can so many computers access the Internet? You don't understand it if you talk too much, the foundation is too poor, hehe.

This is NAT address conversion, in layman's terms, it is a public network address, hanging multiple IP private network addresses, these private network IPs are converted into public IP through NAT, just like a poor family has a lot of children (computers) and can't afford to buy so many clothes (public IP), so every time you go out (on the public network), four or five children change to wear a piece of clothing, but the frequency of change is very fast, hehe. I don't know if you can understand it.

The IP address belongs to the reserved address, that is, it can be used on any local area network. In fact, the only thing to identify each host is to have a MAC address (physical address) unique to each network card, and the physical address is unlikely to be the same.

The IP address under the WAN is provided by the ISP (Internet Service Provider), and this address is used to identify the local LAN to access the Internet, which is a bit like the area code of **, and the IP address in the LAN is like the ** number.

Telecom or Netcom only gives you an IP address, which has to be paid. Only the address given to you by Telecom or Netcom can access the Internet, that is, the WAN address (gateway address), and the others are intranet addresses. You are using an intranet** to contact the gateway and use the gateway address to access other hosts.

Similarly, if someone else does not know your host address, they can only access your gateway and find your host through the IP address in the route table.

That's how the Internet café came about (there's a NAT technology in it).

You just build a small LAN, use your IP as a server, and then divide them into two subnets, as for how to build a LAN, it's good to search on the Internet, you need to use sinfornat (**server) software.

It's a private IP address, and you can use it in the LAN as long as it doesn't conflict. The address below the WAN port is a public IP address and is unique.

First of all, the given subnet mask is 22 bits, i.e.:

Binary: 1111 0000;The corresponding decimal system is:

The IP host of the device has a total of 2 10=1024. Subtracting that is, it can accommodate 1024-2=1022 hosts, which is enough for our needs this time.

So is this the same network segment as AND? The answer is from the same network segment, why?

Perform logic and operation on the IP and subnet masks respectively

ip：：1100 0000

Subnet mask: The equipment used, one core switch, several access switches is sufficient.

PS: If different departments need different VLANs, that is, different network segments, optimize them as appropriate.

b：128-191

Class C private addresses can be assigned to use them however you want.

Hello, the secondary IP address is a Class A address, and without a subnet mask, it is impossible to calculate its network address and host address, and it is impossible to judge whether it can be assigned to the host. If it is not subnetted, its IP address range is.