(ISC)2 Certified in Cybersecurity Practice Exam

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What port range is known as "dynamic" ports?

49,152 - 65,535
10,000 - 65,535
47,455 - 65,535
36,712 - 65,535

The correct answer is: 49,152 - 65,535

The range of ports known as "dynamic" ports is from 49,152 to 65,535. These ports are commonly used for ephemeral connections, which are temporary ports assigned by the operating system when an application creates a network connection. Dynamic ports are typically allocated from this range for client-side communications that require a short-lived connection to a server. In contrast to dynamic ports, there are registered ports (from 1,024 to 49,151) that are assigned by the Internet Assigned Numbers Authority (IANA) for specific services and applications. The lower ports (1 to 1,023) are known as well-known ports and are reserved for widely used protocols like HTTP (port 80) and FTP (port 21). Understanding this classification helps in managing network services and applications effectively, especially in scenarios that involve NAT (Network Address Translation) and firewall configurations where controlling port ranges is crucial for security and connectivity.