1. **Computer Network**: A computer network is a set of interconnected computers that communicate with each other for sharing resources, information, and services.

2. **Packet**: A packet is a unit of data transmitted over a network. It typically contains both the data being transmitted and control information necessary for routing the data to its destination.

**Local Area Network (LAN)**: A LAN is a network that connects computers and devices within a limited geographical area, such as a home, office, or campus. LANs typically use high-speed connections and are privately owned.

4. **Wide Area Network (WAN)**: A WAN is a network that spans a large geographical area, connecting multiple LANs and other networks together. The internet is the largest example of a WAN.

5. **Node**: In a network, a node refers to any device that is connected to the network, such as computers, servers, printers, or routers.

6. **Media Access Control (MAC)**: MAC is a unique identifier assigned to network interfaces for communications on a physical network segment. It ensures that data packets are delivered to the correct destination.

7. **IP Address**: An IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It serves two main purposes: host or network interface identification and location addressing.

8. **Bus Topology**: Bus topology is a type of network topology in which all devices are connected to a single central cable, called a bus. Data is transmitted along the bus, and each device receives the data, but only the intended recipient processes it.

9. **Ring Topology**: Ring topology is a type of network topology in which each device is connected directly to two other devices, forming a ring. Data travels around the ring until it reaches its destination.

10. **Network Token**: A network token is a special data packet used in token-based network protocols. It grants the right to transmit data on the network and is passed from node to node in a predefined order.

11. **Star Topology**: Star topology is a type of network topology in which all devices are connected to a central hub or switch. Data must pass through the central hub to reach other devices on the network.

12. **Tree Topology**: Tree topology is a type of network topology that combines characteristics of bus and star topologies. Devices are arranged hierarchically, with the central nodes connected to the root and leaf nodes.

13. **Protocol**: A protocol is a set of rules and conventions that govern how data is exchanged between devices in a network. Protocols define the format, timing, sequencing, and error control of data transmission.

14. **Peer-to-Peer Architecture**: Peer-to-peer architecture is a decentralized network architecture in which all devices have equal status and can act as both clients and servers. Each device can directly communicate with other devices on the network.

15. **Client/Server Architecture**: Client/server architecture is a network architecture in which client devices request services or resources from server devices. Servers provide centralized resources, such as files, databases, or applications, to multiple clients.