SK0-005 Question #75: Real Exam Question with Answer & Explanation

Question

A server administrator has run the netstat -ano command locally on a system. Upon inspection, the administrator notices a listener for port 123 is set up on the server. Which of the following can the administrator conclude about the server role running on the system?

Options

• AThe dynamic host configuration protocol and role are configured on the server.
• BThe remote desktop protocol and role are configured on the server.
• CThe distribution network service provider and role are configured on the server.
• DThe network time protocol and role are configured on the server.

Explanation

Identifying a listener on port 123 via netstat -ano indicates that the Network Time Protocol (NTP) service is active on the server.

Common mistakes.

• A. Dynamic Host Configuration Protocol (DHCP) typically uses UDP ports 67 and 68, not port 123.
• B. Remote Desktop Protocol (RDP) typically uses TCP port 3389, not port 123.
• C. The 'Distribution network service provider' is not a standard network protocol associated with port 123; DNS uses port 53, for instance.

Concept tested. Common network service ports (NTP)

Reference. https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

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