Self-Contained P Packet format IP= nternet protocol 4-bit4-bit 8-bit Version Header Type of Service 16-bit Total Length(Bytes) Length (TOs) 3-bit 16-bit Identification Flags 13-bit Fragment Offset Header is like a letter envelope 8-bit Time to Live(TTL)8-bit Protocol 16-bit Header Checksum contains all info needed for 32-bit Source P address delivery 32-bit Destination P Address Payload (remainder of message)Self-Contained IP Packet Format 4-bit Version 4-bit Header Length 8-bit Typeof Service (TOS) 16-bit Total Length (Bytes) 16-bit Identification 3-bit Flags 13-bit Fragment Offset 8-bit Time to Live (TTL) 8-bit Protocol 16-bit Header Checksum 32-bit Source IP Address 32-bit Destination IP Address Payload (remainder of message) . . . . . Header is like a letter envelope: contains all info needed for delivery IP = InternetProtocol