A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?

Last Updated: May 3, 2026
IT Exam Items Repository › Category: CCNA 1 v7 › A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?

A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?

  • FTP
  • LDAP
  • SLP
  • SNMP

Explanation: Destination port 21 is the well-known port used by FTP (File Transfer Protocol) for its control connection. This connection is established by the client to send commands to the server and receive replies, which is essential for managing the file transfer process.

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