Computer Network -  A network is a group of computers connected together in a way that allows information to be exchanged between the computers.

Packet -  A piece of a message transmitted over a packet-switching network.

Local area network (LAN) technologies connect many devices that are relatively close to each other, usually in the same building.

Wide area network (WAN) technologies connect a smaller number of devices that can be many kilometers apart.

Node -

 is anything that is connected to the network. While a node is typically a computer, it can also be something like a printer or CD-ROM tower.

Media access control (MAC) is a sublayer of the data link layer (DLL) in the seven-layer OSI network reference model.

IP Address - a unique string of characters that identifies each computer using the Internet Protocol to communicate over a network.

Bus network - is a network topology in which nodes are directly connected to a common half-duplex link called a bus.

Ring Topology - is a network configuration where device connections create a circular data path.

Network tokenization - refers to payment card tokenization that payment networks like Mastercard, Visa, American Express, and Discover offer to replace primary account numbers, also called PANs and other details, with a token provided by the card brand.

Star Network - is an implementation of a spoke–hub distribution paradigm in computer networks. In a star network, every host is connected to a central hub. In its simplest form, one central hub acts as a conduit to transmit messages.

Tree topology - a hybrid network topology in which star networks are interconnected via bus networks. Tree networks are hierarchical, and each node can have an arbitrary number of child nodes.

Protocol -
A set of rules governing the exchange or transmission of data between devices.

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

Client-server model is a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients.