Port Configuration for Email Server Secure Protocols

A network administrator configures an email server to use secure protocols.

When the upgrade is completed, which of the following ports on the firewall should be configured to allow for connectivity? (Choose three.)

A.

TCP 25

B.

TCP 110

C.

TCP 143

D.

TCP 389

E.

TCP 587

F.

TCP 993

G.

TCP 995

EFG.

The email server has been configured to use secure protocols, which means that the network administrator needs to open specific ports on the firewall to allow secure traffic to flow to and from the server.

TCP (Transmission Control Protocol) is a reliable, connection-oriented protocol that operates at the transport layer of the OSI model. It ensures that data is transmitted in a reliable and ordered manner between two devices on a network.

The following are the secure email protocols that use TCP, along with the corresponding port numbers that should be opened on the firewall:

1. Secure SMTP (Simple Mail Transfer Protocol) - TCP port 587 Secure SMTP, also known as SMTPS, uses SSL/TLS encryption to provide a secure communication channel between the email client and the email server. TCP port 587 is commonly used for secure SMTP, and it is usually opened on the firewall to allow outgoing emails from the email server to external recipients.

2. Secure IMAP (Internet Message Access Protocol) - TCP port 993 Secure IMAP, also known as IMAPS, uses SSL/TLS encryption to secure the communication channel between the email client and the email server. TCP port 993 is commonly used for secure IMAP, and it is usually opened on the firewall to allow incoming emails to be retrieved from the email server by the email client.

3. Secure POP3 (Post Office Protocol) - TCP port 995 Secure POP3, also known as POP3S, uses SSL/TLS encryption to provide a secure communication channel between the email client and the email server. TCP port 995 is commonly used for secure POP3, and it is usually opened on the firewall to allow incoming emails to be retrieved from the email server by the email client.

Therefore, the correct answers are E, F, and G, which are the ports used by the secure email protocols that have been configured on the email server.