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Subnets and CIDR Converts a regular subnet mask to binary, the subnet mask is found to be contiguous binary 1 followed by 0, where the subnet mask is 1 in the network ID and the subnet mask is 0 for the host ID. For example, 255.255.0.0 is converted to binary 11111111 11111111 00000000 00000000. In the example cited above, why not use a continuous 1-part representation of the network ID, a continuous 0 part represents the host ID? The answer is yes, the IP
In the actual network environment, depending on the size of the network, the number of hosts in the network is different, the IP address is divided into A,b,c 3 for different sizes of the network, and the IP address is a 32-bit dotted decimal notation, only the IP address can not determine which network it belongs to, in the
First, a sample from a Shehiren teacher's book is referenced:Host H1 the process of sending packets to H2:First, with the subnet mask in the subnet:255.255.255.128 and target host H2 IP address:128.30.33.128 and get network number: 128.30.33.128. Obviously this does not match the network number of Subnet 1:128.30.33.0.The datagram is then forwarded by the default route R1 Subnet 1. At this point, R1 will look for its own routing table. Think of the ho
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 n
: 255.255.0.0Class C: 255.255.255.0Concept:IP Address: IP address, used in an IP network, the only identification of a device, the IP address consists of 32-bit 2 binary number, this 32-bit binary number can be divided into the network and the host two parts of the subnet mask. These 32-bit binary numbers are divided into 4 bytes (one byte equals 8 bits)10.1. 23.
In 1969, only four nodes of the ARPA network were successfully tested in the United States. Could anyone think that the evolved Internet would become the world's largest data network. With the popularization of computers and the increasing number of Internet users, more and more enterprises are focusing on the Internet. IP technology is the key to supporting the operation of the Internet. The basic concepts and IP
One, there are class addressing: the idea of classifying IP addresses according to strict boundaries is a class addressing.For example, the A,b,c,d,e class address in the IP address is a class addressing.Benefits: There is a class addressing the network number and host number is strictly separate, effectively using the
There are class addressing and no-class addressingSubnets and can be turned into subnet masks (VLSM)Sub-grid: If the Class B is divided into Class C, Class A is divided into Class B, the address of the class addressing is mesh into a subnet where all masks are consistent. The address space is the same size.Variable eldest son netmask: The size of the divided address space is inconsistent, and a network numb
other active interface until the failed interface is repaired. Some failovers may not select the standby interface. Instead, these failovers may choose an active interface that has fewer data addresses configured to up than the standby interface.Only test addresses should be configured on the standby interface. IPMP does not allow data addresses to be added to interfaces configured with the Ifconfig command as standby. Any attempts to create this type of configuration will fail. Similarly, if y
1. network addressing rulesA. The network address must be unique.B. The network ID cannot start with a number 127. In Class A addresses, the number 127 is reserved for the internal return function.C. The first byte of the network logo cannot be 255. The number 255 is used as the broadcast address.D. the first byte of the network ID cannot be "0". "0" indicates that the address is a local host and cannot be transferred.2. Host
three bits to address. A computer byte is 8 bits. So TCP/IP uses 4 bytes.A computer byte can contain a different value:00000000,00000001,00000010,00000011,00000100,00000101, 00000110,00000111,00001000 ... Until 11111111.Now, you know why the TCP/IP address is 4 numbers between 0 and 255 .Domain name It's hard to remember a few Arabic numerals. It's easier to use a name.The name used for the TCP/
All hosts are now required to support subnet addressing (RFC 950 [mogul and Postel 1985]). Not the I P addressAs a simple network number and a host number, but the host number is divided into a subnet number and a host number.The reason for this is because the Class A and Class B addresses allocate too much space for the host number, and the number of hosts that can be accommodated separately is22 4-2 and 21 6-2. In fact, in a network people do not ha
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