title: 1's complement - Can 1 bit or 2 bit errors go undetected? How? Why?
body: <p>Within a network packet header, when 1's complement is used with 8 bit bytes (rather than the 16 bits normally used in TCP), can a 1 bit error go undetected?</p>
  
  <p>can a 2 bit error go undetected? </p>
  
  <p>If they can how and why does this happen? </p>