If you plan on taking the Security+ exam you should have a good understanding of TCP/IP including email protocols. While email protocols aren’t that difficult to understand, you should know them and can expect to see many test questions on them such as which one is used to send email, which one is used to receive email, and what ports each use. This blog covers each along with these details.
Note: This blog is an excerpt from the
CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide.
Email Protocols
Some common protocols used for e-mail include:
- SMTP. Simple Mail Transport Protocol transfers e-mail between clients and SMTP servers, and between SMTP servers. SMTP uses port 25.
- POP3. Post Office Protocol v3 transfers e-mails from servers down to clients. POP3 uses port 110.
- IMAP4. Internet Message Access Protocol is used to store e-mail on an e-mail server. IMAP4 allows a user to organize and manage e-mail in folders on the server. IMAP4 uses port 143.
| Protocol | Port |
| SMTP | 25 |
| POP3 | 110 |
| IMAP4 | 143 |
Do you know the ports for the protocols in the following table?
| Protocol | Port |
| SSH | |
| SCP | |
| SFTP | |
| HTTP | |
| HTTPS | |
| FTP | |
| SFTP | |
| FTPS | |
| TFTP | |
| Telnet | |
| SNMP | |
| DNS | |
| NetBIOS | |
| LDAP | |
| LDAP (secure) | |
| Kerberos | |
| Microsoft SQL Server | |
| RDP | |
| PPTP | |
| L2TP | |
| TACACS | |
| TACACS+ |
Check Port Numbers
Here are some links to other blogs covering ports and protocol IDs:
- Security+ Ports
- Ports for Network+, Security+, and SSCP Exams
- Protocol IDs for Security+ and SSCP Exams
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