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Question 1
Which port is commonly used for X11 network services?
Correct Answer:
6000
Explanation:
X11 uses a port number that is derived from the display number. The convention is 6000 plus the display. With the default display :0, the X11 server listens on 6000, making that port the standard for X11 network services. If the display were :1, it would be 6001, and so on. The other ports listed correspond to different services (for example, 1194 is commonly used by OpenVPN, 5432 by PostgreSQL), so they aren’t associated with X11.
Question 2
Which port and protocol is commonly used by Microsoft SQL Server?
Correct Answer:
1433 TCP
Explanation:
The common way to connect to Microsoft SQL Server is using TCP on port 1433. This port is the default listening port for the SQL Server Database Engine, so standard clients reach the server at that address and port unless a different port is configured. If you set up a named instance, SQL Server can listen on a dynamic port and the SQL Server Browser service helps clients discover it via UDP on port 1434, but for everyday connections the default is TCP 1433. The other options correspond to different technologies (3306 is MySQL, 1883 is MQTT, 6379 is Redis) and are not the typical SQL Server ports.
Question 3
Which port is the FTPS data channel? (FTP over SSL data)
Correct Answer:
989
Explanation:
FTPS can operate in two modes: implicit and explicit TLS. In implicit FTPS, the TLS handshake starts as soon as the connection is made, and the data and control channels use fixed ports. The standard pair for implicit FTPS is the control channel on 990 and the data channel on 989. That makes 989 the port used for the FTPS data channel. If you were using explicit FTPS, the TLS upgrade happens over the standard FTP control port (21) and the data channel port would follow normal FTP behavior (20 for active mode or a dynamically negotiated port for passive mode), not a fixed 989.
Question 4
Which port range would you configure for VNC to support displays beyond the primary?
Correct Answer:
5900-5907
Explanation:
VNC assigns a port for each display by adding the display number to 5900. The primary display (:0) uses 5900, and additional displays (:1, :2, etc.) map to 5901, 5902, and so on. To support displays beyond the primary, you need the range that covers these ports, which is 5900-5907 (enabling displays 0 through 7). Other port ranges don’t follow VNC’s display-to-port mapping, so they wouldn’t reliably handle extra displays.
Question 5
Which port number is used by the Daytime service?
Correct Answer:
13
Explanation:
Daytime is a simple service that returns the current date and time as plain ASCII text, and it is assigned to port 13 for both TCP and UDP. That assignment comes from the standard that defines Daytime, so port 13 is the correct one. The other ports correspond to different services (for example, 9, 19, and 135 are used for Discard, Chargen, and RPC Endpoint Mapper, respectively), so they aren’t used by Daytime.
Question 1
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About this Exam

Prepare with the CPSA Port Numbers with Services and Protocols Practice Test practice quiz. This question bank includes 10 questions covering port, commonly, data, number, and tftp. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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CPSA Port Numbers with Services and Protocols Practice Test

This practice set contains 10 questions from the matching question bank and focuses on port, commonly, data, number, and tftp. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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