(56)is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(57)i

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问题 (56)is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(57)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.(58)is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.(59)is a device used to connect two separate network that use different communication protocol.(60)is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

选项 A、Router
B、Gateway
C、Bridge
D、hub

答案B

解析 是一种用来连接两个使用不同协议的独立网络的设备。
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