Posted filed under CompTIA Network+.

Identify Commonly Used TCP/UDP Ports 

Ports are what an application uses when communicating between a client and server computer.
Some common ports are:

 

Protocol Type Number
FTP TCP 20,21
SSH TCP 22
TELNET TCP 23
SMTP TCP 25
DNS TCP/UDP 53
DHCP UDP 67
TFTP UDP 69
HTTP TCP 80
POP3 TCP 110
NTP TCP 123
IMAP4 TCP 143
SNMP UDP 161
HTTPS TCP 443

 

 

**Source by wikipedia**

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