四级四级网络工程师网络工程师全真模拟试卷（四）上午试题

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• 31(72).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．<br class="bogusBR">(73).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．<br class="bogusBR">(74).is a device used to connect two separate network that use different communication protocol．<br class="bogusBR">(75).is a digital-to-digital polar encoding method in which the signal level is always either positive or negative．

  A.MD

  B.RSA

  C.DES

  D.MIB

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