1) What is the IP address IP address, that is, the Internet address or Internet address can also be called. It is used to unique logical addresses that identify the computer on the Internet. Each connected computer relies on IP addresses to identify yourself. It is very similar to our phone number. Find the corresponding phone by phone number. The phone number around the world is unique. The IP address is also the same.
2) Features of the IP address:
IP addresses must be unique to each connected computer to distinguish between IP addresses, interconnecting network devices to help you find destination IP addresses based on IP addresses, and any individuals cannot use.
3) The IP address representation: 4 decimal integers separated by decimal point is an IP address. Each part of the decimal integer is actually composed of 8 binary numbers. So the maximum of 255, the minimum is 0
4) Structure and Classification of IP: In these four parts of the IP address, it can be divided into two parts. Part is the network number network NETWORK (used to identify the network), part is the host number (identify a specific specific to a network) Host). Everyone may ask, that in these four parts, which part represents the network, which part indicates the host? So in this, we divide the IP address into category A, B, C class.
Class A address, the first group represents the network, and the three groups indicate the host. Class B address, first, two groups represent the network, and the main unit is indicated by two groups. Class C addresses, first, second, and three groups represent the network, and the last set represents the host.
5) What is a mask: How to divide how the network number and host number of the IP address are divided. That is to say, in an IP address, the mask is used to determine which part represents the network, which represents the host. Everyone prescribed that the "1" represents the network part and uses "0" to represent the host part. That is, the computer can know which network you are through the IP address and mask. So the mask is important, you must configure it correctly, otherwise, you will get the wrong network address.
6) What is a default gateway: it is an IP address of the router connected to the host in the same subnet. As shown in the figure below, suppose we are in the network, there is a packet to give the machine in the network, this packet must first give the port of the router connected to us. That is, the red circle shown in the figure. It is forwarded to the host in the network. It is very similar to us to send a letter, don't need you personally send your trust, just give it to the postman. The post is forwarded again. So this configuration must be correct in configuring your computer. Otherwise, the computer does not know that the packet is turned to.
7) The IP address is obtained: There are two ways, one is a static method, one is a dynamic manner.
Static dynamics are allocated by network managers, which is generally generally used in DHCP technology.
