CREST Practitioner Security Analyst (CPSA) Practice

Which service is not associated with a specific port from the list given?

1. Telephony Services

2. Message Send Protocol

3. Time Protocol

4. SQL Services

The correct answer is: Telephony Services

Telephony services are typically not associated with a specific port because they encompass a wide variety of protocols and technologies that can operate over various network configurations. Unlike some other services that rely on specific well-known ports (like SQL Services often using port 1433 or the Time Protocol generally using port 37), telephony services can be delivered over different ports depending on the protocol being used (e.g., SIP, RTP, or other signaling methods) and the network setup. In contrast, the other options have more standardized associations with specific ports. For instance, the Message Send Protocol, commonly related to email and messaging services, has designated ports such as for SMTP. The Time Protocol, which is used for synchronizing clocks via the network, typically uses port 37. SQL services have recognized ports, usually port 1433 for Microsoft SQL Server. Hence, while these services depend on specific ports for communication, telephony services represent a broader category without a designated singular port.