TCP: A Closer Look

• TCP has a Flags Field

  • Six one-bit flags

Source Port # (16)

Destination Port # (16)

Sequence Number (32 bits)

Acknowledgement Number (32 bits)

Hdr Len

(4)

Flags (6)

Window Size (16)

Options (if any)

PAD

Bit 0

Bit 31

Reserved (6)

TCP Checksum (16)

Urgent Pointer (16)

TCP Segment

Data Field

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