SK0-004 · Question #812
Users are unable to send and receive email. A technician verifies services are running, but the server is still not sending and receiving emails. Which of the following commands is BEST to use to…
The correct answer is A. netstat. When email services are confirmed running but mail is not flowing, netstat is the best tool to inspect active network connections and verify whether the mail ports are actually bound and accepting traffic.
Question
Users are unable to send and receive email. A technician verifies services are running, but the server is still not sending and receiving emails. Which of the following commands is BEST to use to find the cause?
Options
- Anetstat
- Bnslookup
- Cipconfig
- Dnbtstat
How the community answered
(47 responses)- A94% (44)
- B4% (2)
- D2% (1)
Why each option
When email services are confirmed running but mail is not flowing, netstat is the best tool to inspect active network connections and verify whether the mail ports are actually bound and accepting traffic.
Netstat displays all active TCP/UDP connections and listening ports, allowing the technician to confirm whether the mail server is listening on the expected ports such as 25 (SMTP), 110 (POP3), or 143 (IMAP). If a required port is not shown in a LISTENING state, it identifies exactly where communication is breaking down despite the service process appearing to run.
Nslookup queries DNS name resolution and MX records, which is useful for diagnosing external delivery issues but does not reveal whether the local mail service is bound to its ports.
Ipconfig displays local IP configuration and adapter state, which does not provide insight into whether application-layer mail services are accepting connections.
Nbtstat resolves NetBIOS names and displays NetBIOS session information, which is unrelated to SMTP/POP3/IMAP mail service connectivity.
Concept tested: Using netstat to diagnose mail server port connectivity
Source: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/netstat
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