Which of the following SMTP client commands identifies the client? Select exactly 1 answer (s) from the following:

The correct answer is C. EHLO. EHLO (Extended Hello) is the SMTP command a client sends to identify itself to the mail server - it announces the client's domain name and signals support for ESMTP extensions (its predecessor, HELO, served the same purpose for basic SMTP). The other options are all different…

Describe Cisco Email Security Solutions

Question

Options

AMail From
BDATA
CEHLO
DRCPT To
EThe period "." on a single line.

How the community answered

(45 responses)

A
4% (2)
B
2% (1)
C
89% (40)
E
4% (2)

Explanation

EHLO (Extended Hello) is the SMTP command a client sends to identify itself to the mail server - it announces the client's domain name and signals support for ESMTP extensions (its predecessor, HELO, served the same purpose for basic SMTP). The other options are all different phases of the same email transaction: MAIL FROM specifies the sender's address, RCPT TO specifies the recipient, DATA signals that the message body follows, and the period on a single line (<CR><LF>.<CR><LF>) terminates the DATA block, telling the server the message is complete.

Memory tip: Think of EHLO as a handshake - it's the first thing said, like introducing yourself ("Hello, I'm client.example.com"), before any mail-related conversation begins.

Topics

#SMTP protocol#EHLO command#Client identification#Email communication

Community Discussion

No community discussion yet for this question.

Full 700-280 Practice