CCNA Well-Known Ports

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Most important network ports for CCNA

Last updated 7:40 PM on 10/14/26
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12 Terms

1
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SSH - Secure Remote Access

22 - TCP

2
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Telnet - Unsecure Remote Access

23 - TCP

3
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DNS - Resolves domain names to IPs

53 - Both TCP/UDP

4
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DHCP - Automatically assigns IP addresses

67,68 - UDP

5
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FTP - File Transfer

20,21 - TCP

6
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TFTP - Simple File Transfer

69 - UDP

7
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HTTP - Unencrypted Web Traffic

80 - TCP

8
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HTTPS - Encrypted Web Traffic

443 - TCP

9
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NTP - Time Synchronization

123 - UDP

10
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SNMP - Network Monitoring

161,162 - UDP

11
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Syslog - Network Device Logging

514 - UDP

12
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SMTP - Sending Emails

25 - TCP