Essential TCP and UDP Port Numbers Quiz

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| Attempts: 17 | Questions: 17 | Updated: Aug 4, 2025
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1. What is the port used for SSH (Secure Shell) communication?

Explanation

The correct answer is SSH-Secure Shell-TCP, as it is commonly used for secure remote access to systems.

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About This Quiz
Essential TCP And Udp Port Numbers Quiz - Quiz

Enhance your understanding of TCP and UDP port numbers with this focused quiz. Dive into the essentials of network protocols, learning and revising through interactive questions that test and solidify your knowledge, crucial for IT and networking professionals.

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2. What is the protocol typically associated with port 23?

Explanation

Port 23 is often used for Telnet, which is a text-based communication protocol. SSH (Secure Shell) typically uses port 22, HTTP (Hypertext Transfer Protocol) uses port 80, and FTP (File Transfer Protocol) uses ports 20/21.

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3. What protocol is typically associated with Port 25?

Explanation

Port 25 is commonly used for SMTP, which is responsible for sending email messages over a network. While other protocols like HTTP, FTP, and SSH use different ports and methods for data transfer, SMTP specifically handles email communication.

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4. What is Port 80 commonly used for?

Explanation

Port 80 is commonly used by web servers to send and receive HTTP messages over TCP. FTP uses Port 21, SMTP uses Port 25, and SSH uses Port 22 for their respective services.

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5. Which protocol is associated with Port 110?

Explanation

Port 110 is commonly used for POP3, which is used for receiving emails from a mail server. SMTP is used for sending emails, HTTP for web browsing, and FTP for file transfers, making them incorrect choices.

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6. Which protocol uses Port 161?

Explanation

Port 161 is commonly used by SNMP (Simple Network Management Protocol) for network monitoring and management tasks.

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7. What protocol uses Port 119?

Explanation

Port 119 is commonly associated with NNTP (Network News Transfer Protocol) TCP, which is used for transferring Usenet articles between servers. SMTP uses port 25, HTTP uses port 80, and FTP uses port 21.

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8. What protocol uses port 123?

Explanation

Port 123 is commonly associated with NTP (Network Time Protocol) which is used for time synchronization on computer networks.

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9. What protocol is typically associated with Port 20?

Explanation

Port 20 is commonly used for FTP (File Transfer Protocol) TCP data sending, allowing for the transfer of files between a client and a server.

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10. What service is typically associated with port 21?

Explanation

Port 21 is commonly used for FTP (File Transfer Protocol) which is used for transferring files between a client and server. HTTP uses port 80, SSH uses port 22, and SMTP uses port 25.

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11. What protocol is typically associated with Port 68?

Explanation

Port 68 is commonly used for DHCP (Dynamic Host Configuration Protocol) client communications, allowing devices to obtain IP addresses and other network configuration information automatically.

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12. Port 69 is associated with which protocol?

Explanation

Port 69 is used by TFTP, which is a simple file transfer protocol that operates over UDP. HTTP, FTP, and SMTP each use different ports and protocols for their respective functionalities.

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13. What service is generally associated with port 53?

Explanation

Port 53 is typically used for DNS (Domain Name Service) over TCP. This service translates domain names to IP addresses, allowing users to access websites and other resources on the internet.

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14. What is the function of Port 67 in networking?

Explanation

Port 67 is specifically designated for DHCP servers to listen for client requests. DHCP is used to assign IP addresses dynamically to devices in a network.

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15. Which port is commonly used for private mail systems with the UDP protocol?

Explanation

Port 24 is commonly associated with private mail systems using the UDP protocol. Ports 80, 53, and 123 are commonly used for HTTP, DNS, and NTP protocols respectively.

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16. Which protocol is commonly associated with Port 443?

Explanation

Port 443 is commonly used for HTTPS communication which is secured by SSL (Secure Socket Layer) protocol over TCP (Transmission Control Protocol). HTTP (Hypertext Transfer Protocol), FTP (File Transfer Protocol), and SMTP (Simple Mail Transfer Protocol) are commonly associated with different port numbers and are not typically used on Port 443.

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17. What service is typically associated with Port 24?

Explanation

Port 24 is commonly used for private mail systems TCP, not for HTTP, FTP, or SSH services.

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What is the port used for SSH (Secure Shell) communication?
What is the protocol typically associated with port 23?
What protocol is typically associated with Port 25?
What is Port 80 commonly used for?
Which protocol is associated with Port 110?
Which protocol uses Port 161?
What protocol uses Port 119?
What protocol uses port 123?
What protocol is typically associated with Port 20?
What service is typically associated with port 21?
What protocol is typically associated with Port 68?
Port 69 is associated with which protocol?
What service is generally associated with port 53?
What is the function of Port 67 in networking?
Which port is commonly used for private mail systems with the UDP...
Which protocol is commonly associated with Port 443?
What service is typically associated with Port 24?
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