how to calculate subnet

different networks, so it does not pass.Here is a conclusion: the computer with a direct connection to the network cable or through the hub (hub) or the ordinary switch between the computer to be able to communicate with each other, the computer must be on the same network, that is, their network address must be the same, And the host address must be different. If it is not a network will not be able to pass. This is like the example we cited above, the same as the North Street tenants because

is 202.112.14.159.In the ccna test, you also need to plan the subnet address and calculate the subnet mask based on the number of hosts on each network. This can also be calculated based on the above principles. For example, if a subnet has 10 hosts, the IP address required for this

is a private address and cannot be applied directly in the Internet. The Internet must be converted to a public address.I. Why do I need to calculate the network address?In a word, computers in the network can communicate with each other. first, let's look at the simplest network. Figure 3 uses a network cable (crossover line) to directly connect the two computers. the following are several IP address settings to see if the network is accessible unde

IP subnet addressing All Hosts must support subnet addressing (rfc950 [mogulandpostel1985]). IThe P address is simply composed of a network number and a host number. Instead, the host number is divided into a sub-network number and a host number.The reason for this is that Class A and Class B addresses allocate too much space for the master host number, and the number of hosts can be-2 and 21 respectively.6

bits and 1 are the same, the IP address belongs to the same network segment, the one after the 24-bit path changes randomly and belongs to the same network segment. In this example, the IP address (a) 188.188.0.111 is in the range of 188.188.0.0 ~ 188.188.1.255, which belongs to the same network segment only. The IP address range of IP (B) In the same network segment is 188.188.4.0 ~ The range of 188.188.5.255 is obviously not in the range of IP (a), so IP (A) and IP (B) are not in the same net

): Network address + host address =192.168.100.1Broadcast address: 192.168.100.255How are these addresses calculated? Why calculate these addresses? To know how, first to understand a truth, the purpose of learning Network is how to make the network of computers communicate with each other, that is, around the word "tong" to learn and understand the concept of the network, rather than just back a few nouns.Note: 192.168.100.1 is a private address that

, although Network Communication in the LAN is not affected, it is actually an irregular division. 　　 Among so many network IP addresses, some IP addresses are used in our LAN, that is, private IP addresses, which are not used in the public network. Their range is: 10.0.0.0 ~ 10.20.255.255 172.16.0.0 ~ 172.31.255.255 192.168.0.0 ~ 192.168.255.255 ---- Example exercise ---------- Example Now, we can give some practical examples to have a deep understanding of the

two IP addresses belong to the same subnet. When calculating the subnet mask, pay attention to the reserved IP addresses, that is, the "0" address and broadcast address, these are IP addresses when the host address or network address is "0" or "1". They represent the current network address and broadcast address, which cannot be included. The following example describes the

All the calculation and application of the subnet mask are based on the binary, so we should focus on the binary form of The netmask. Generally, we can view the IP attribute in decimal format. in order to make it easier for users to watch, in fact, computers use binary methods to calculate and use subnet masks, A common IP address is composed of a network ID and

broadcast address is the end. The available host address is within this range. Therefore, it is slightly smaller than 137, and only 128 is the multiple of 32, therefore, the network address is 202.112.14.128. The broadcast address is the network address of the next network minus 1. The next 32 is a multiple of 160. Therefore, the broadcast address is 202.112.14.159. You can refer to this example to understand: In the CCNA test, you also need to plan the sub