CompTIA A+ Ports

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Last updated 3:32 AM on 10/11/26
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14 Terms

1
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20/21

FTP (TCP) - File Transfer Protocol | (Data Channel) and (Control Channel)

2
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22

SSH (TCP) - Secure Shell - Encrypted remote access

3
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23

Telnet (TCP) - Unencrypted remote access (legacy)

4
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25

SMTP (TCP) - Simple Mail Transfer Protocol - Outgoing email

5
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53

DNS (UDP) - Domain Name System - Name resolution

6
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67

DHCP (UDP) - Dynamic Host Configuration - Server

7
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68

DHCP (UDP) - Dynamic Host Configuration - Client

8
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80

HTTP (TCP) - Hypertext Transfer Protocol - Web traffic

9
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110

POP3 (TCP) - Post Office Protocol v3 - Incoming email (download)

10
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143

IMAP (TCP) - Internet Message Access Protocol - Incoming email (sync)

11
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443

HTTPS (TCP) - HTTP Secure - Encrypted web traffic

12
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445

SMB (TCP) - Server Message Block - Windows file sharing

13
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3389

RDP (TCP) - Remote Desktop Protocol - Windows remote access

14
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137-139

NetBIOS (TCP/UDP) - Network Basic Input/Output - Windows networking