In order to achieve the purpose of communication, the host needs to participate in a number of communications, this is the ip address, it is unique.
Host name is the name of a computer network in a specific range.
The domain name is one of the servers in the Internet range.
Generally the following relationship:
1, IP address of the network number = (specific network prefix) + particular network node (host address)
2, domain name includes the host name
1, IP address for the communication of all.
2, IP address does not represent a specific host, but on behalf of a host link with a particular network.
3, a host can have multiple IP addresses (in case some of the network can not be used), so that a domain name can have multiple IP addresses, but can only use one at a time IP.
4, an IP address can only act on a site, but a site can have more than one computer, this is the principle of network address translation (HAT) technology, wireless WiFi technology.