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Protocol
Transport
Category
Risk
Network port training
PortLab
Memorize less. Diagnose better. Learn ports by protocol, transport, security risk, and real troubleshooting context.
scantcp/443open
serviceHTTPSsecure web
riskmediumcerts/proxy
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Port → Protocol
Port Anatomy
Port
A numbered logical endpoint that helps a device send traffic to the correct service.
Protocol
The service or rule set using that port, such as SSH, DNS, HTTPS, or SMB.
TCP vs UDP
TCP is connection-oriented and reliable. UDP is lighter and commonly used where speed or simplicity matters.
Open, closed, filtered
Open means a service responds. Closed means no listener. Filtered often means a firewall or ACL is interfering.
Inbound vs outbound
Inbound rules protect services receiving connections. Outbound rules control what clients and agents can reach.
Firewall thinking
Good troubleshooting asks: source, destination, port, transport, service status, route, and security policy.