SK0-003 · Question #104
Which of the following commands should the administrator run to check if the SMTP services are still active?
The correct answer is A. Telnet <Server name> 25. To check if an SMTP service is active and listening on a server, an administrator should use the telnet command to attempt a connection to the standard SMTP port 25.
Question
Which of the following commands should the administrator run to check if the SMTP services are still active?
Options
- ATelnet <Server name> 25
- BPing <Server name>
- Cnet send <Server name> test mail
- Dnbtstat a <Server name>
How the community answered
(23 responses)- A74% (17)
- B4% (1)
- C4% (1)
- D17% (4)
Why each option
To check if an SMTP service is active and listening on a server, an administrator should use the telnet command to attempt a connection to the standard SMTP port 25.
The `Telnet <Server name> 25` command attempts to establish a TCP connection to port 25 on the specified server, which is the standard port for the Simple Mail Transfer Protocol (SMTP). A successful connection, indicated by a response from the server, confirms that the SMTP service is running and actively listening for connections on that port.
The `ping` command checks for basic network connectivity and reachability of a host using ICMP, but it does not verify if a specific application service, such as SMTP, is running on a particular port.
The `net send` command is a legacy messaging utility for the Windows Messenger Service and is not used to check the status or connectivity of SMTP services; it is largely deprecated and often disabled in modern systems.
The `nbtstat -a <Server name>` command displays NetBIOS over TCP/IP (NBT) protocol statistics and name table information, which is unrelated to checking the status or connectivity of an SMTP service.
Concept tested: Verifying SMTP service connectivity
Source: https://learn.microsoft.com/en-us/exchange/architecture/mail-flow/test-smtp-connectivity?view=exchserver-2019
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