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MODULE 5: Layer 4 Transport Overview Welcome to Module 5, in this lesson we will focus on the Transport Layer, Layer 4. You'll learn what happens to data when it's transported and that transport transaction is not acknowledged. We'll explain the concept of addressing schemes, what they impact. You'll be able to define what a Segment is, name the functions of each component that makes up a Segment and what those interrelationships do to facilitate the handshaking process as well the number of segments that can be sent/transported at one time.