(ISC)2 Certified in Cybersecurity Practice Exam

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What is port 443 used for?

HTTP
HTTPS
FTP
RDP

The correct answer is: HTTPS

Port 443 is widely recognized as the default port used for HTTPS, which stands for Hypertext Transfer Protocol Secure. This protocol is crucial for secure communication over a computer network, particularly the internet. HTTPS integrates a layer of encryption using SSL (Secure Socket Layer) or TLS (Transport Layer Security), which ensures that data transferred between the web server and the client remains private and resistant to interception and tampering. Using HTTPS is essential for securing sensitive data, such as credit card information, personal details, and other confidential communications, making it the primary choice for secure online transactions and activities. Websites that use HTTPS typically display a padlock icon in the browser's address bar, indicating that the connection is secure. In contrast, other options pertain to different protocols that serve distinct purposes. HTTP operates on port 80 and does not include encryption, making it less secure than HTTPS. FTP (File Transfer Protocol), used for transferring files, typically operates on ports 20 and 21. RDP (Remote Desktop Protocol) is designed for remote access to systems and usually runs on port 3389. Thus, these protocols do not serve the same secure communication purpose that HTTPS does on port 443.