Which TCP ports need to be opened in the firewall between the Web Server and Application server?

Question

Options

• A993
• B2434
• C9001
• D15097

• A
  77% (27)
• B
  14% (5)
• C
  6% (2)
• D
  3% (1)

Explanation

Port 993 is the standard TCP port for IMAPS (IMAP over SSL/TLS) - secure, encrypted email retrieval. If the application server in this scenario is handling secure mail services, the web server must communicate over port 993 to securely fetch or relay email data.

Why the distractors are wrong:

• B (2434): Associated with Microsoft SQL Server browser/named instances - a database access port, not a web-to-app server communication port in this context.
• C (9001): Used by some application servers (e.g., Supervisor process manager, or certain custom app servers), but not the correct answer here - likely included as a plausible-sounding distractor.
• D (15097): Not a widely recognized standard port; included to test whether exam takers can distinguish valid ports from arbitrary numbers.

Memory tip: Remember "993 = secure IMAP" by associating it with its sibling port - 143 is plain IMAP, and 993 is IMAP + SSL (think: 143 upgraded to encrypted = 993). If a question involves encrypted mail retrieval between servers, 993 is your port.

Note: In general networking practice, 993 is not a typical web-to-app server port. If this question is from a vendor-specific exam (e.g., a mail server product), verify the product context - the answer may depend on a specific architecture scenario described elsewhere in the exam.

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