An engineer needs to verify the external record for SMTP traffic. The engineer logged in to the server and entered the nslookup command. Which of the following commands should the engineer send before entering the DNS name?
To verify the external record for SMTP traffic using nslookup, the engineer should use the following command before entering the DNS name:
D. set querytype=MX
This command sets the query type to MX (Mail Exchange) records, which are used to specify mail servers responsible for receiving email messages on behalf of a domain. In the context of verifying the external record for SMTP traffic, setting the query type to MX will provide information about the mail servers associated with the specified domain.
An MX record, or mail exchange record, is a DNS record that routes emails to specified mail servers. MX records essentially point to the IP addresses of a mail server's domain. MX records are especially useful for users who host or lease an email because it differentiates web and email servers.
D. set querytype=MX
Using the "set querytype=MX" command in the nslookup utility will allow you to query and retrieve the MX records for a domain. These MX records determine the mail servers responsible for receiving email traffic for that domain. This is directly related to verifying the external records for SMTP traffic, as SMTP is the protocol used for sending and receiving emails.
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