An organization recently switched from a cloud-based email solution to an in-house email server. The
firewall needs to be modified to allow for sending and receiving email. Which of the following ports
should be open on the firewall to allow for email traffic? (Select THREE).
A.
TCP 22
B.
TCP 23
C.
TCP 25
D.
TCP 53
E.
TCP 110
F.
TCP 143
G.
TCP 445
Explanation:
Port 25 is used by Simple Mail Transfer Protocol (SMTP) for routing e-mail between mail servers.
Port 110 is used for Post Office Protocol v3 (POP3), which is an application-layer Internet standard
protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection.
Port 143 is used by Internet Message Access Protocol (IMAP) for the management of email messages.
Incorrect Answers:
A: Port 22 is used for all protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin.B: Port 23 is used by the Telnet protocol for unencrypted text communications.
D: Port 53 is used by Domain Name System (DNS).
G: Port 445 is used by the Microsoft directory service for Server Message Block (SMB) file sharinghttps://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
https://en.wikipedia.org/wiki/Post_Office_Protocol