IPV4 address:
an IP address for the (network interface or apparatus) identifies a node in the network
IP addresses for addressing in the IP packet network
32 constituting the dotted decimal binary identification
existence of network and host bits; the same broadcast All devices within the network have the same bit, different bit hosts;
different devices in different domains broadcast its network location; network and host bits dependent on a subnet mask IP addresses to distinguish;
NETMASK netmask:
netmask 32bits, the number of bits of the IP address is the same as
netmask in the stack of successive binary representation is 1, followed by the consecutive 0
'bit value of 1 corresponding to the IP address of the network bits, bit 0 to the bit corresponding to the host IP address
into ABCDE categories:
where ABC is a unicast address - either ip address as the source, can be used as the destination IP address;
class D address as the multicast address - only as the destination address;
E class addresses are reserved - research use;
Personal appreciated:
A Class Address: 0XXX XXXX 1-126 network mask 255.0.0.0 2 ^ 24-2
Class B addresses: 10XX XXXX 128-191 network mask 255.255.0.0 2 ^ 16-2
Class C addresses: 110X XXXX 192-223 netmask 255.255.255.0 2 ^ 8-2 is
a class D address: 1110 XXXX 224-239 multicast address unmasked
class E addresses: 1111 XXXX 240-255 for Research
Why subnetting?
How subnetting?
Methods:
1. determine the categories, looking mask;
2. Change the mask, find the subnet;
3. draw subnet number;
4. draw mainframe section;
5. No results broadcast;
For example, 192.168.1.0/25 subnetting
summary formula
