An organization recently installed a firewall on the network. Employees must be able to send and receive email from a POP3 server. In which of the following ways should the firewall be configured?…

The correct answer is B. Allow TCP port 25 C. Allow TCP port 110. Email requires two distinct operations: (1) Sending email uses SMTP on TCP port 25 - this must be allowed for outbound mail to leave the organization. (2) Receiving/retrieving email from a POP3 server uses TCP port 110 - this must be allowed so clients can download messages…

Network security

Question

An organization recently installed a firewall on the network. Employees must be able to send and receive email from a POP3 server. In which of the following ways should the firewall be configured? (Select TWO).

Options

AAllow TCP port 23
BAllow TCP port 25
CAllow TCP port 110
DAllow UDP port 25
EAllow UDP port 110

How the community answered

(34 responses)

A
3% (1)
B
82% (28)
D
12% (4)
E
3% (1)

Explanation

Email requires two distinct operations: (1) Sending email uses SMTP on TCP port 25 - this must be allowed for outbound mail to leave the organization. (2) Receiving/retrieving email from a POP3 server uses TCP port 110 - this must be allowed so clients can download messages from the mail server. Both protocols use TCP, not UDP. Allowing only one port would break either sending or receiving. Port 23 (Telnet) is unrelated to email.

Topics

#POP3#SMTP#email protocols#firewall rules

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