DNS Records for SMTP Traffic
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Question
Which of the following DNS records needs to be configured for SMTP traffic?
A.
MX B.
CNAME C.
AAAA D.
PTR.
A.
Explanations
Which of the following DNS records needs to be configured for SMTP traffic?
A.
MX
B.
CNAME
C.
AAAA
D.
PTR.
A.
The correct answer is A. MX.
MX (Mail Exchange) records are DNS records that specify which servers should receive email messages for a given domain. When an email is sent, the sender's email server looks up the MX record for the recipient's domain to determine where to deliver the email.
SMTP (Simple Mail Transfer Protocol) is the protocol used to send email messages over the Internet. In order for SMTP traffic to be properly routed, the MX record for the recipient's domain must be properly configured.
CNAME (Canonical Name) records are used to map an alias (such as "www") to the actual hostname of a server. AAAA (IPv6 Address) records are used to specify the IPv6 address of a server. PTR (Pointer) records are used in reverse DNS lookups to map an IP address to a domain name.
While these records may be important for other types of network traffic, they are not directly relevant to SMTP traffic. Therefore, the correct answer is A. MX.
