Interview Practice Questions

Q1: List of TCP and UDP Ports Wikipedia

Q2: What port number is used for File Transfer Protocol (FTP) for control commands and responses?
21

Q3: Which port does Secure Shell (SSH) and Secure File Transfer Protocol (SFTP) use to provide secure network services over an unsecured network?
22

Q4: What port is associated with the insecure virtual terminal protocol, Telnet?
23

Q5: Which port is the standard for Simple Mail Transfer Protocol (SMTP) for email transmission?
25

Q6: What port does the Domain Name System (DNS) use for queries?
53

Q7: What port does a Dynamic Host Configuration Protocol (DHCP) server use to listen for client requests?
67

Q8: Which port is used by a Trivial File Transfer Protocol (TFTP) server?
69

Q9: What is the port number for Hypertext Transfer Protocol (HTTP), the foundation of data communication for the World Wide Web?
80

Q10: Which port is used by Network Time Protocol (NTP) to synchronize computer clocks over a network?
123

Q11: For Simple Network Management Protocol (SNMP), which port is used by the management station to send commands to network devices?
161

Q12: What is the default port for Lightweight Directory Access Protocol (LDAP)?
389

Q13: Which TCP port is used for Hypertext Transfer Protocol Secure (HTTPS), providing secure communication over a computer network?
443

Q14: What port does the Server Message Block (SMB) protocol use, primarily by Windows systems Active Directory for file sharing?
445

Q15: Which port is used by the Syslog service to send log messages to a centralized server?
514

Q16: What port is used for Secure SMTP (SMTPS), which adds a layer of encryption to email communications?
587

Q17: What port number is assigned to Lightweight Directory Access Protocol over SSL (LDAPS) for secure directory service queries?
636

Q18: Which TCP port does Microsoft's SQL Server use for client connections to its database management system?
1433

Q19: What is the default port number used by MySQL, a popular open-source relational database management system
3306

Q20: Which port is utilized by the Remote Desktop Protocol (RDP) for providing remote graphical interface access to other computers?
3389

Q21: What is the primary port used by the Session Initiation Protocol (SIP) for unsecured VoIP communications?
5060