Basic concept of computer network

1, three types of IP address:

1) Class A IP address

A Class A IP address consists of a 1-byte network address and a 3-byte host address, the highest bit of the network address must be "0", and the address range is from 1.0.0.0 to 126.0.0.0. There are 126 available Class A networks, each of which can hold more than 100 million hosts.

2) Class B IP Address
A class B IP address consists of a 2-byte network address and a 2-byte host address, the highest bit of the network address must be "10", and the address range is from 128.0.0.0 to 191.255.255.255. There are 16,382 available Class B networks, each of which can hold more than 60,000 hosts.
3) Class C IP Address
A Class C IP address consists of a 3-byte network address and a 1-byte host address, and the highest bit of the network address must be "110". range from 192.0.0.0 to 223.255.255.255. Class C network can reach more than 2.09 million, each network can accommodate 254 hosts.

2. Subnet mask

Level Two IP address: the first 16 digits indicate the network number, and the last 16 bits indicate the host number

Level Three IP address: the first 16 digits represent the network number, the next 8 bits represent the subnet number, and the last 8 bits indicate the host number

3, ARP is the address Resolution Protocol, the IP address is mapped to the hardware address, rarp is the inverse Address Resolution Protocol, mapping its own hardware address to the IP address.

Basic concept of computer network