Source:The English Department at the University of Virginia, Lindsey Kordis
The Transport Layer Ensures The Reliable Arrival
of Messages And Provides Error Checking Mechanisms
and Data Flow Controls
- May Be Connexionless (e.g., User Datagram Protocol, UDP)
- Or Connection Oriented (e.g., Transport Control Protocol, TCP)
TCP And UDP Both Have A Source And Destination Port
- UDP/TCP Headers Contains 16 Bit Source And Destination
Ports, Checksum, Sequence Number, Etc.
Destination Ports
- Usually Defined In The ETC Services File And Are Fixed
Source Ports
- Are Chosen Arbitrarily, Usually Above 1024
