Remote Access
This port is not secure and should be blocked.
What is 23 Telnet?
You browse the Internet, but you wouldn't use it for online banking.
What is HTTP 80?
DNS
Convert domain names to IP addresses
Port 69
TFTP
SMTP
tcp/25 Simple Mail Transfer Protocol
The server that issues IP addresses
DHCP 67
Port used to transfer data.
What is FTP 20?
POP3
tcp/110 Post Office Protocol version 3
Client port to obtain IP address.
68 DHCP
The port is used for the control of transfer data.
21
IMAP4
tcp/143 Internet Message Access Protocol v4
Uses ICMP packets
What is port 7 Echo?
Also known as SFTP
SSH 22
HTTPS
Web server communication with encryption
Port that is responsible for updating/synchronizing time
NTP 123