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SK0-005 · Question #87

During monthly security scans, a new server is found on the network. It is determined the server is question is listening on the following TCP ports: 25, 80, 110, 443, and 587. Which of the…

The correct answer is C. Mail server. The server is likely a mail server because it is listening on common ports associated with email protocols like SMTP, POP3, and IMAP, alongside web-related ports often used for webmail interfaces.

Server administration

Question

During monthly security scans, a new server is found on the network. It is determined the server is question is listening on the following TCP ports: 25, 80, 110, 443, and 587. Which of the following roles is this server MOST likely fulfilling?

Options

  • AWeb server
  • BDatabase server
  • CMail server
  • DDirectory server

How the community answered

(36 responses)
  • A
    17% (6)
  • B
    8% (3)
  • C
    72% (26)
  • D
    3% (1)

Why each option

The server is likely a mail server because it is listening on common ports associated with email protocols like SMTP, POP3, and IMAP, alongside web-related ports often used for webmail interfaces.

AWeb server

While ports 80 and 443 are indicative of a web server, the presence of ports 25, 110, and 587 points specifically to email services beyond just a web server.

BDatabase server

Database servers typically listen on ports like 1433 (SQL Server), 3306 (MySQL), 5432 (PostgreSQL), or 1521 (Oracle), which are not listed.

CMail serverCorrect

A mail server utilizes various TCP ports for sending and receiving email. Port 25 (SMTP) is for sending email, port 110 (POP3) is for receiving email, and port 587 (SMTP Submission) is for submitting outgoing email securely, while ports 80 (HTTP) and 443 (HTTPS) are commonly used for webmail access.

DDirectory server

Directory servers, such as those using LDAP, typically listen on ports 389 (LDAP) and 636 (LDAPS), which are not among the listed ports.

Concept tested: Server roles and associated TCP ports

Source: https://learn.microsoft.com/en-us/windows/security/threat-protection/security-auditing/well-known-ports-for-tcpip

Topics

#Network services#Common ports#Server roles#Port identification

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