Network Port
A Network Port is a number that sends traffic to one service on a computer. TCP and UDP use ports.
Another example
A frontend uses port 4321 and calls an API on 8000. The public proxy exposes only HTTPS on 443.
Main parts
- 01Originating request
- 02Resolution or processing hop
- 03Response, timing, and failure
Use it when
Set ports clearly for local services, containers, firewalls, health checks, and reverse proxies.
Do not use it when
Do not expose database or admin ports publicly. Separate container ports from published host ports.
Name used in code
host:port / EXPOSE / firewall rule Before you ship
Check contracts and invariants, authorization, and input limits. Test retries, one-time effects, timeouts, and partial failures. Verify data integrity, compatibility, monitoring, recovery, and rollback.
Outcome: Design or review Network Port for this system while keeping data correct, secure, and easy to operate. User context: A frontend uses port 4321 and calls an API on 8000. The public proxy exposes only HTTPS on 443. Technical concept or control: Network Port. Why it fits: Set ports clearly for local services, containers, firewalls, health checks, and reverse proxies. Do not use it when: Do not expose database or admin ports publicly. Separate container ports from published host ports. Engineering requirements: Define inputs, outputs, contracts, and rules that must always hold. Set authorization and input checks. Define failures, timeouts, retries, one-time effects, data moves, and compatibility limits. Operations: Add useful signals and logs that hide sensitive data. Set capacity limits and write an operator guide. Test recovery and rollback. Acceptance criteria: Contract and failure-path tests pass. Data and authorization rules still hold during retries and partial failures. Check performance limits, monitoring, recovery, and rollback. Evidence and limits (evidence boundary): The standard covers only the listed scope. It does not choose the visual style, product decision, or Vibulary example. Unknowns to confirm: Where the code runs, data stores, traffic shape, consistency needs, and the security boundary. Also confirm the compatibility period, service goals, and rollback limits.
Check this request
Review the current use of Network Port. Definition: A Network Port is a number that sends traffic to one service on a computer. TCP and UDP use ports. Release checks: Check contracts and invariants, authorization, and input limits. Test retries, one-time effects, timeouts, and partial failures. Verify data integrity, compatibility, monitoring, recovery, and rollback. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.