| Term | Definition |
| Internet | It is a global network connecting millions of computers and in turn people. |
| IP address | It is an identifier for a computer or device on a TCP/IP network. |
| Network | It is a group of two or more computer systems linked together. |
| Packet | It is a piece of a message transmitted over a packet-switching network. |
| Datagram | It is a data packet that is sent over an IP network. |
| Domain Name | These are used to identify one or more IP addresses. |
| Domain Name Server | Also known as Domain Name System or Service and is an Internet service that translates domain names into IP addresses. |
| Topology | It can be defined as the shape of a local-area network (LAN) or other communications system. Topologies are either physical or logical. |
| Term | Definition |
| Routing | In internetworking, it is the process of moving a packet of data from source to destination. Routing is usually performed by a dedicated device called a router. A key feature of the Internet because it enables messages to pass from one computer to another and eventually reach the target machine. |
| Multiprotocol Label Switching (MPLS) | Multi-Protocol Label Switching was originally presented as a way of improving the forwarding speed of routers but is now emerging as a crucial standard technology that offers new capabilities for large scale IP networks. Traffic engineering, the ability of network operators to dictate the path that traffic takes through their network, and Virtual Private Network support are examples of two key applications where MPLS is superior to any currently available IP technology. |