Network ports to know
The 26 well-known ports asked about in networking and security (CCNA, Security+, system administration): SSH 22, DNS 53, HTTPS 443, RDP 3389… both ways. On the back, the transport (TCP or UDP) and what the service does.
- 52 cards
- 1 topics
- Free
The outline, topic by topic
Each topic is weighted the way the exam weighs it.
- Ports
A few cards from the deck
Port of FTP
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20, 21
TCP. File transfer: 21 for commands, 20 for data.
Port of SSH
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22
TCP. Encrypted remote shell, and SFTP.
Port of Telnet
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23
TCP. Remote shell in clear text, replaced by SSH.
Port of SMTP
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25
TCP. Mail transfer between servers.
Port of DNS
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53
UDP and TCP. Domain name resolution.
Port of DHCP
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67, 68
UDP. Automatic IP address assignment: 67 on the server, 68 on the client.