What is the basic communication language or protocol of the Internet?

The basic communication language or protocol of the Internet is the Transmission Control Protocol/Internet Protocol, often referred to as TCP/IP. TCP/IP is a set of protocols that enables different networks and devices to communicate with each other over the Internet. It functions by breaking down data into packets, which are then routed to the destination where they are reassembled, ensuring reliable and ordered communication.

The TCP/IP model comprises layers, with the Internet Protocol (IP) responsible for addressing and routing the packets, while the Transmission Control Protocol (TCP) ensures that packets are transmitted reliably and in the correct order. This fundamental architecture allows for the scalability and interoperability of the various devices and networks that make up the Internet today.

In contrast, the other options provided serve different purposes. ARPANET was one of the earliest networks and a precursor to the Internet but is not a protocol itself. ISDN is a set of communication standards for simultaneous digital transmission of voice, data, and video, not a foundational protocol for Internet communication. DNS is a system that translates human-readable domain names into IP addresses, enabling users to access websites; however, it operates at a higher level and relies on TCP/IP for its function. Hence, TCP/IP is indeed recognized as the foundational communication protocol for