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Free TCP/IP Quiz

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TCP-IP

Free TCP/IP Quiz

by July 16, 2026

Take our free TCP/IP exam to check your knowledge.

This quiz features many of the common questions you will be asked in exams such as the CompTIA A+, Network+, and Cisco CCNA, as well as technical job interviews. Aim for 23/25.

1. Which port does HTTP use by default?

Question 1 of 25

2. Which port does HTTPS use by default?

Question 2 of 25

3. Which port is used by SSH for secure remote access?

Question 3 of 25

4. Which port does Telnet use?

Question 4 of 25

5. Which port is used by DNS?

Question 5 of 25

6. Which port does SMTP use for sending email?

Question 6 of 25

7. Which TWO ports are associated with FTP? (Select two.)

Question 7 of 25

8. Which port does RDP (Remote Desktop Protocol) use?

Question 8 of 25

9. Which protocol uses UDP ports 67 and 68?

Question 9 of 25

10. How many layers are in the OSI model?

Question 10 of 25

11. Which is Layer 1 of the OSI model?

Question 11 of 25

12. A switch primarily operates at which OSI layer?

Question 12 of 25

13. IP addressing and routing operate at which OSI layer?

Question 13 of 25

14. The TCP protocol operates at which OSI layer?

Question 14 of 25

15. Which OSI layer is responsible for encryption, decryption and data formatting?

Question 15 of 25

16. Which TWO protocols operate at the Application layer (Layer 7)? (Select two.)

Question 16 of 25

17. MAC addresses are used at which OSI layer?

Question 17 of 25

18. Which of the following addresses falls within the Class A range?

Question 18 of 25

19. Which address is the IPv4 loopback address?

Question 19 of 25

20. A host shows an address of 169.254.x.x. What does this indicate?

Question 20 of 25

21. Which TWO of the following are private (RFC 1918) address ranges? (Select two.)

Question 21 of 25

22. What is the dotted-decimal subnet mask for /24?

Question 22 of 25

23. How many usable host addresses are available in a /24 network?

Question 23 of 25

24. The subnet mask 255.255.255.240 is equivalent to which CIDR notation?

Question 24 of 25

25. How many usable host addresses are available in a /29 subnet?

Question 25 of 25


 

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