 Source & Destination Ports – 16 bits Specify source and destination applications for encapsulated data Assigned ports are numbered from 0 – 1023  Example: TFTP is port 69, Doom is 666 Any private application uses port numbers above 1023  Sequence Numbers – 32 bits Identifies where encapsulated data fits in data stream from sender  Example: if sequence # of segment is 1234 and segment contains 512 bytes of data, next segment should have sequence # of 1747 (1234 + 512)
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