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Table Of Contents
CEH v10 Certified Ethical Hacker Study Guide
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Moving to the Transport layer, we first run across the TCP. Where IP is a best-effort protocol, meaning that a best effort is made to get messages from one system to another, TCP is said to have guaranteed delivery. This is less impressive, perhaps, than it sounds. Obviously, TCP by itself can’t ensure delivery in the case of catastrophic failure in the network. Instead, what it means is there are mechanisms in the protocol that keep track of all of the messages that are sent, and if something doesn’t get to the other end and acknowledged there, messages will be resent.
The protocol data unit for TCP is called a segment.
The layers we have looked at so far have forms of addressing. The Transport layer is no different. Where previous addresses are related to the systems to ensure messages get from one system to another, at the Transport layer, we start to become concerned about getting messages to the application. Transport layer protocols provide ports as...
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