Which Port Is Used for SQL Database Command-Line Connectivity?
A technician is troubleshooting a SQL database connection. After remotely connecting to the end client, the technician tests basic connectivity. Which of the following ports is available to connect via command-line interface?
Community Votes
82% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
This question tests your ability to identify default database service ports among common network ports, with a trap of confusing SQL-related services with email or file-sharing ports.
Port 1521 is the default port used by Oracle SQL databases for SQL*Net connections, making it the correct choice for SQL database command-line connectivity. Community consensus strongly supports answer D, with 82 votes versus 18 for port 445.
The most common wrong answer is B (445), which is used for SMB/CIFS file sharing and directory services, not for SQL databases. Some test-takers may mistakenly associate 445 with Microsoft SQL Server, but SQL Server uses 1433 by default.
Community Discussion (5 comments)
Comments & Corrections
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Expert Analysis
Why the Answer Is Correct
Port 1521 is the well-known default port for Oracle Database's SQLNet listener, which handles client connections to Oracle SQL databases. Comment [1] correctly states that port 1521 is commonly used by Oracle SQL databases for SQLNet connections, while comment [3] explains that this port allows database servers to service client requests transparently.
Why the Other Options Are Wrong
Port 143 is used by IMAP (Internet Message Access Protocol) for email retrieval, not for database connectivity. Port 445 is used for SMB/CIFS file sharing and Microsoft directory services, not for SQL. Port 993 is used for IMAPS (secure IMAP) for email, not for SQL database connections. Comment [1] accurately explains each of these incorrect port usages.
Community Comment Notes
Most commenters support D (1521), as seen in votes (D: 82, B: 18) and comments [1], [2], and [3]. Comment [2] notes that given the context of SQL and database management, port 1521 is most appropriate. One comment [4] simply states "It's 445," but this is incorrect because 445 is SMB, not a SQL listener port. The consensus is clearly D.
Official Reference
Exam Strategy
Memorize the default port numbers for major database services: Oracle uses 1521, MySQL uses 3306, and Microsoft SQL Server uses 1433. On port identification questions, immediately eliminate ports that are clearly for email (143, 993, 110, 995) or file sharing (445, 139, 137/138) unless the question explicitly mentions those services.