A computer network is a group of computers connected together in a way that allows information to be exchanged between computers.

Packet is a piece of a message carried by a packet-switched network. 

Local Area Netwrk (LAN) is a computer network that interconnects computers in a certain area.

Wide Area Network (WAN) is a telecommunication network that extends over a large geographical distance.

A node is anything that is connected to the network.

An IP address is a numerical label assigned to each device connected to a computer.

A bus topology is a topology for a Local Area Network (LAN) in which all the nodes are connected to a single cable.

A ring topology is a topology for a Local Area Network (LAN) in which every device has exactly two neighbors for communication purposes.

A network token is a local area network (LAN) in which all computers are connected in a ring or star topology and pass one or more logical tokens from host to host.

A star topology is a topology for a Local Area Network (LAN) in which all nodes are individually connected to a central connection point, like a hub or a switch. 

A tree topology is a special type of structure in which many connected elements are arranged like the branches of a tree.

A network protocol defines rules and conventions for communication between network devices.

Peer-to-peer architecture (P2P architecture) is a commonly used computer networking architecture  in which each workstation, or node, has the same capabilities and responsibilities. 

Client/server architecture is a computing model in which the  server hosts, delivers and manages most of the resources and services to be consumed by the client.