CERTIFIED-IN-CYBERSECURITY · Question #520
CERTIFIED-IN-CYBERSECURITY Question #520: Real Exam Question with Answer & Explanation
The correct answer is A: Ports 49152 ?65535. According to the Internet Assigned Numbers Authority (IANA), port numbers are divided into three ranges: Known Ports (0- 1023), Registered Ports (1024-49151), and Dynamic or Private Ports (49152-65535). The dynamic or private ports are those from 49152 to 65535. These ports are t
Question
What port range refers to dynamic or private ports?
Options
- APorts 49152 ?65535
- BPorts 80, 443, 65431
- CPorts 1024 ?49151
- DPorts 0 ?1023
Explanation
According to the Internet Assigned Numbers Authority (IANA), port numbers are divided into three ranges: Known Ports (0- 1023), Registered Ports (1024-49151), and Dynamic or Private Ports (49152-65535). The dynamic or private ports are those from 49152 to 65535. These ports are typically used for ephemeral ports, which are temporary and only used for the duration of a specific communication session (see ISC2 Study Guide, Chapter 4, Module 1). For example, when a web browser makes a request to a web server, it uses a dynamic port number for the outgoing connection. This port number is chosen from the dynamic or private range (49152- 65535). This allows the web browser to maintain multiple concurrent connections to the server, each with a unique port number.
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