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  (66)  is a one-way function that takes an arbitrarily long piece of plaintext and from itcomputes a fixed-length bit string.
  (67)   is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
  (68)   is an approach preferred by cable TV providers.In this solution the fiber terminates at an optoelectrical converter and the final  segment is a shared coaxial cable.
  (69)   is a device used to connect two separate network that use different communicationprotocol.
  (70)   is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
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