(ISC)2 Certified in Cybersecurity Practice Exam

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Prepare for the (ISC)2 Certified in Cybersecurity Exam with comprehensive quizzes and extensive question banks. Enhance your skills with detailed explanations and practice tests designed to improve your expertise for the certification exam. Get exam-ready now!

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What is port 21 used for?

HTTP
SSH
FTP
SMB

The correct answer is: FTP

Port 21 is primarily used for File Transfer Protocol (FTP), which facilitates the transfer of files between a client and a server over a network. FTP operates in a client-server model and allows users to upload, download, and manage files on a server. When a client connects to an FTP server, the connection is typically established using port 21, which serves as the control channel for initiating and managing the file transfer sessions. Understanding why port 21 is designated for FTP highlights the specific roles different ports play in internet communication. While other protocols, such as HTTP, SSH, and SMB, use their designated ports (80, 22, and 445, respectively), port 21 is integral to the functionality of FTP, enabling users to share files effectively over the internet. This is essential for network operations where interoperability and file sharing are necessary.