Connected arcade machines rely on various networking protocols to ensure smooth communication and multiplayer functionality. The most common protocols include:

1. TCP/IP (Transmission Control Protocol/Internet Protocol): The backbone of most networked arcade systems, TCP/IP ensures reliable data transmission between machines and servers. It's ideal for maintaining stable connections in online leaderboards and multiplayer modes.

2. UDP (User Datagram Protocol): Often used for real-time gameplay, UDP prioritizes speed over reliability, making it suitable for fast-paced arcade games where minor data loss is acceptable.

3. HTTP/HTTPS: These protocols are commonly used for fetching updates, downloading game content, or connecting to cloud-based services.

4. LAN (Local Area Network) Protocols: Many arcades use LAN setups for local multiplayer gaming, relying on Ethernet or Wi-Fi for low-latency communication.

5. Proprietary Protocols: Some manufacturers develop custom protocols optimized for their hardware, ensuring minimal lag and high performance.

Understanding these protocols helps arcade operators maintain seamless connectivity and enhance the gaming experience.