CERTIFIED-IN-CYBERSECURITY Question #486: Real Exam Question with Answer & Explanation

Question

What are the 'known' ports?

Options

• APorts 80, 443, 65431
• BPorts 1024 - 49151
• CPorts 0 - 1023
• DPorts 49152 - 65535

Explanation

Known ports are those that range from 0 to 1023. These ports are assigned by the Internet Assigned Numbers Authority (IANA) and are typically used by system-level or root processes. Known ports are used by Internet Protocol Suite transport layer protocols, such as TCP and UDP (see ISC2 Study Guide, Chapter 4, Module 1). For example, port 80 is reserved for HTTP traffic and port 443 is reserved for HTTPS traffic. The other options are incorrect because they describe different ranges of ports. Ports 1024-49151 are known as "registered ports". These are not as well known as ports 0 through 1023, but they are still recognized by IANA and are often used for specific applications. For example, port 3306 is the default port for the MySQL database system. Ports 49152-65535 are known as dynamic or private ports. These ports are not controlled by IANA and can be used by any application. They are typically used for ephemeral ports, which are temporary and only used during a communication session. Finally, the option that lists ports 80, 443, 65431 is incorrect because it only lists three specific ports.

No community discussion yet for this question.