Which of the following are Internet standard protocols for email retrieval? Each correct answer
represents a complete solution. Choose two.

A.
IMAP4

B.
POP3

C.
SMTP

D.
SNMP

Explanation:

IMAP4 and POP3 protocols are Internet standard protocols for email retrieval.
Internet Message Access Protocol 4 (IMAP4) is an e-mail message retrieval protocol that allows email clients to retrieve e-mail messages from
e-mail servers.

Post Office Protocol version 3 (POP3) is a protocol used to retrieve e-mails from a mail server. It is
designed to work with other applications
that provide the ability to send e-mails. POP3 is mostly supported by the commercially available mail
servers. It does not support retrieval of
encrypted e-mails. POP3 uses port 110.
Answer D is incorrect. Simple Network Management Protocol (SNMP) is a part of the TCP/IP
protocol suite, which allows users to
manage the network. SNMP is used to keep track of what is being used on the network and how the
object is behaving.
Answer C is incorrect. Simple Mail Transfer Protocol (SMTP) is a protocol for sending e-mail
messages between servers. E-mailing
systems use this protocol to send mails over the Internet. SMTP works on the application layer of the
TCP/IP or OSI reference model. The
SMTP client typically initiates a Transmission Control Protocol (TCP) connection to the SMTP server
on the well-known port designated for
SMTP, port number 25. However, e-mail clients require POP or IMAP to retrieve mails from e-mail
servers.