(51)is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point 

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问题 (51)is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.(52)is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.(53)functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.(54)is the popular LAN developed under the direction of the IEEE802.5.(55)is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

选项 A、X.25
B、ATM
C、FDDI
D、SMDS

答案C

解析 (1)MAC地址(The MAC address)是一个位于OSI第二层的六位地址。它被内置到每个网络设备里,以给每个点对点的通信提供惟一的标识。(2)IEEE是一个专业组织,它由多个领域内的专业人士组成,主要致力于低层协议。(3)网桥(The bridge)的功能涉及两层协议。它可以连接不同速度的网络,也可以适应扩展的环境。(4)令牌环网(Token Ring)是根据IEEE802.5标准开发的流行的局域网。(5)FDDI是高速传输信息的流行的骨干技术,并具有高度的容错性,它是在ANSI的指导下开发的。
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