Ierorgrfcrfc1071txt how good is it 16 bits not very

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Unformatted text preview: top of the network layer (IP) layer and provide • Can provide: - –  Applica)on- level mul)plexing (“ports”) Application-level multiplexing (“ports”) –  Error detec)on, reliability, etc. - Error detection, reliability, etc. Error Detec)on •  Idea: add redundant informa)on to catch errors in packet •  Three examples: –  Parity –  Internet Checksum –  CRC Parity Bit •  Parity –  Can detect odd number of bit errors –  No correc)on Data: 1101101 Even Parity: 1 Transmit: 11011011 hnp://en.wikipedia.org/wiki/Parity_bit 2- D Parity Parity bits 0101001 1101001 1 0001110 1 0110100 1 1011111 Parity byte 0 1011110 Data 1 0 1111011 0 •  Add 1 parity bit for each 7 bits •  Add 1 parity bit for each bit posi)on across the frame) –  Can correct single- bit errors –  Can detect 2- and 3- bit errors, most 4- bit errors Checksum •  Algorithm –  Set Checksum field to 0 –  Sum all 16- bit words, adding any carry bits to the LSB (one’s complement...
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