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Most important network ports for CCNA
SSH - Secure Remote Access
22 - TCP
Telnet - Unsecure Remote Access
23 - TCP
DNS - Resolves domain names to IPs
53 - Both TCP/UDP
DHCP - Automatically assigns IP addresses
67,68 - UDP
FTP - File Transfer
20,21 - TCP
TFTP - Simple File Transfer
69 - UDP
HTTP - Unencrypted Web Traffic
80 - TCP
HTTPS - Encrypted Web Traffic
443 - TCP
NTP - Time Synchronization
123 - UDP
SNMP - Network Monitoring
161,162 - UDP
Syslog - Network Device Logging
514 - UDP
SMTP - Sending Emails
25 - TCP
SMB - File Sharing
445 - TCP