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Module 5: Application Layer & Security

20262m

A client wants to access www.example.com but does not know its IP address. Which application-layer service is responsible for resolving the domain name?

  • (i) FTP
  • (ii) TELNET
  • (iii) DNS
  • (iv) SMTP
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Answer: (iii) DNS

The Domain Name System translates human-readable domain names (e.g. www.example.com) into IP addresses. FTP is for file transfer, TELNET for remote login and SMTP for email.

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