Network addressing concepts
There are different types of network addresses. An address serves to identify a node in a network. For example, the Internetwork Packet Exchange (IPX) protocol was an earlier protocol that was used to access nodes on a network. The X.25 is a protocol suite for Wide Area Network (WAN) packet switching. A MAC address provides a unique identifier for network interfaces at the physical network level. However, our primary interests are IP addresses.
URL/URI/URN
These terms are used to refer to the name and location of an Internet resource. A URI identifies the name of a resource, such as a website, or a file on the Internet. It may contain the name of a resource and its location.
A URL specifies where a resource is located, ...
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