ITPEC IP October 2023 Question 32
Which of the following is the mechanism that determines the correspondence between domain names and IP addresses on the Internet?
Explanation
DNS — the Domain Name System links domain names to IP addresses.
People use names such as www.example.com, but packets are routed by IP address. When a PC needs to reach a host by name, it asks a DNS server, which answers with the matching IP address (name resolution); the PC then connects to that address. DNS servers are organised in a hierarchy, each responsible for its own part of the domain name space.
Answer (a)
Why not others:
- •(b) FTP — File Transfer Protocol, which sends and receives files between a client and a server
- •(c) SMTP — Simple Mail Transfer Protocol, which sends e-mail from mail software to a server and between mail servers
- •(d) Web — the World Wide Web, the system of linked pages fetched with HTTP; it uses DNS to find servers but does not do the name resolution itself
Key rule: DNS resolves names to addresses, FTP transfers files, SMTP sends mail and HTTP carries web pages.
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