An administrator is setting up a new mail server on the network and wants to open necessary ports to allow POP3 protocol for mail delivery.
Which of the following ports should be opened in the internal and external firewalls?
Click on the arrows to vote for the correct answer
A. B. C. D.B.
The correct answer is B. 110.
POP3 (Post Office Protocol version 3) is a protocol used to retrieve email from a remote server. By default, it uses TCP port 110 to communicate between the email client and the email server.
When setting up a mail server, the administrator will need to open the necessary ports on both the internal and external firewalls to allow communication between the email client and the email server.
The internal firewall protects the internal network from external threats and can be configured to allow incoming and outgoing traffic on specific ports. The external firewall is typically provided by the Internet Service Provider (ISP) and is used to protect the internal network from external attacks.
To allow POP3 traffic through the firewalls, the administrator will need to open TCP port 110 on both the internal and external firewalls. This will allow email clients to communicate with the mail server over the Internet.
Option A, port 101, is not used for email traffic and does not need to be opened for POP3 to function. Port 123, option C, is used for Network Time Protocol (NTP) traffic and is not related to email delivery. Port 161, option D, is used for Simple Network Management Protocol (SNMP) traffic and is not related to email delivery either.