Security+ Port Numbers

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Last updated 12:15 AM on 7/7/26
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17 Terms

1
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FTP (data)

Port 21. Unencrypted file transfer, data channel. No confidentiality or integrity protection.

2
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FTP (control)

Port 21. Unencrypted file transfer, command/control channel. Credentials sent in cleartext.

3
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Telnet

Port 23. Unencrypted remote terminal access. Full session including credentials sent in cleartext. Replaced by SSH.

4
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SMTP

Port 25. Unencrypted mail transfer between servers. No built-in encryption; STARTTLS can upgrade it but base protocol is plaintext.

5
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TFTP

u/69. Trivial File Transfer Protocol. No authentication, no encryption. Used for network booting and device config transfers.

6
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HTTP

Port 80. Unencrypted web traffic. No confidentiality or integrity; vulnerable to on-path interception.

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POP3

Port 110. Unencrypted mail retrieval. Downloads and typically deletes mail from server; credentials in cleartext.

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NTP

u/123. Network Time Protocol. Unauthenticated by default; can be abused for DDoS amplification.

9
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NetBIOS

Port 137. Legacy Windows name resolution/session service. No encryption; largely deprecated in favor of DNS/SMB direct.

10
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IMAP

Port 143. Unencrypted mail retrieval, keeps mail on server (unlike POP3). Cleartext unless upgraded via STARTTLS.

11
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SNMP (agent)

u/161. Simple Network Management Protocol, versions 1/2c send community strings in cleartext. v3 adds auth/encryption.

12
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SNMP trap

u/162. Unsolicited alert messages sent from managed device to management station. Same cleartext risk as SNMP v1/2c.

13
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LDAP

Port 389. Unencrypted directory access protocol for querying/modifying directory services like Active Directory.

14
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SLP

Port 427. Service Location Protocol. Discovers services on a local network; historically abused for DDoS reflection attacks.

15
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rsh

Port 514. Remote shell, legacy Unix remote command execution. No encryption, weak host-based trust auth.

16
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syslog

u/514. Unencrypted system logging protocol. Log messages sent in cleartext over UDP; can be spoofed.

17
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RIP

u/520. Routing Information Protocol. Legacy distance-vector routing; no authentication in v1.