Which of the following are Internet standard protocols for email retrieval?
Each correct answer represents a complete solution. Choose two.
A.
SNMP
B.
POP3
C.
SMTP
D.
IMAP4
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 emails. POP3 uses port 110.
Answer option A 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 option 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.
Reference: “http://en.wikipedia.org/wiki/Internet_Message_Access_Protocol”