Internet Service Identification: VoIP, FTP, DNS, and Spreadsheet Calculation

The question asks us to identify which of the listed options is NOT considered an Internet service. An Internet service is a technology or application that relies on the Internet infrastructure to function or provide its primary service. Let's examine each option:

Analyzing the Options

• Voice over Internet Protocol (VoIP): This service allows voice communication (like phone calls) over the Internet Protocol, essentially using the internet for phone calls. Therefore, VoIP is an Internet service.
• File Transfer Protocol (FTP): FTP is a standard network protocol used for the transfer of computer files between a client and server on a computer network. It is a fundamental part of the Internet. Thus, FTP is an Internet service.
• Spreadsheet Calculation: This refers to the functionality of software like Microsoft Excel or Google Sheets, where users perform calculations using cells and formulas. While these applications might use the Internet for cloud storage, collaboration, or updates, the core act of calculation itself is a software function performed locally or on a server, not inherently an Internet service. It does not require the Internet to perform basic calculations.
• Domain Name System (DNS): DNS acts like the Internet's phonebook, translating human-readable domain names (like www.google.com) into machine-readable IP addresses (like 172.217.160.142). This service is crucial for navigating the Internet. Hence, DNS is an Internet service.

Conclusion on Internet Services

Based on the analysis, VoIP, FTP, and DNS are core technologies and services that operate over or are fundamental to the functioning of the Internet. Spreadsheet calculation, however, is a software feature primarily focused on data manipulation and calculation. It can be used offline and does not depend on the Internet for its basic operation.

Therefore, Spreadsheet Calculation is the correct answer as it is not inherently an Internet service, unlike the others listed.