Network Port

Abstract

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• IP Address only give 1-1 connection between 2 entities, Network Port allows Many-Many connection between 2 entities. So we can have many different services running under the same IP Address, we just need to assign a different network port for each service to make the services distinguishable

Useful CLi Commands

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Test for a Open Port

telnet <IP_ADDRESS> <PORT_NUMBER>

Check what service is running on specific port

sudo lsof -i tcp:<port_number>