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CEH v10 Certified Ethical Hacker Study Guide
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Let’s clear this up, in case there is confusion. We aren’t talking about passing by a cruise ship, peering in windows. We are talking about network communication devices. A port is a construct within the operating system’s network stack. When an application has network service functionality, it binds to a port, meaning it reserves the port and registers the application to get messages that come in on that port. Any communication received by the system addressed to one of the ports gets forwarded to the application that is registered to that port. When there is an application listening on a port, it is considered to be open. Remember that ports exist at the Transport layer, so applications determine whether they are going to use UDP or TCP as the protocol to listen on. The reason for mentioning this is that the objective of port scanning is to identify the software that is bound to the ports that are identified as open.
TCP, as you should know, uses...
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