Refer to the exhibit.
Which DNS Query Types pertains to email?
A.
A?
B.
NS?
C.
SOA?
D.
PTR?
E.
MX?
F.
TXT?
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E is correct. MX queries are for Email.
When an e-mail message is sent through the Internet, the sending mail transfer agent (MTA) queries the Domain Name System for MX records of each recipient’s domain name. This query returns a list of host names of mail exchange servers accepting incoming mail for that domain and their preferences. The sending agent then attempts to establish an SMTP connection.
A? == Address record.
NS? == Delegates a DNS zone to use the given Authoritave name servers.
SOA? == Start of (a zone of ) authority record.
PTR? == Pointer record: pointer to a canonical name. (for reverse DNS lookups)
TXT? == Text record
Instead of memorizing look up what each one of the answer choices means and you guys saying there isn’t any right answer would have quickly came up with E as a right answer.
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