Domain names such as “jrfnet.com” are human-friendly labels, while IP addresses are numerical identifiers used by routers and hosts. The Domain Name System (DNS) maps each domain name to its corresponding IP address so that when users type the name, the network can route packets to the correct server.
Option A:
This option correctly explains that DNS translates readable domain names into numerical IP addresses. Users work with names, but machines rely on the mapped IP numbers for routing packets on the Internet.
Option B:
This statement is false because domain names and IP addresses have different formats and purposes. A domain like “jrfnet.com” is not the same string as its numeric address, and the two are not interchangeable.
Option C:
Domain names are specifically designed to identify online resources such as websites, mail servers and other services. They are not labels for offline printed books, so this option misunderstands their role.
Option D:
IP addresses are stored in devices and routing tables and are actively used in communication. They are not just written on paper, so claiming they exist only on paper is incorrect.
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