A．星型(star)
- A星型(star)
- B环型(ring)
- C树型(tree)
- D总线型(bus)
问题
A．星型(star)
参考解析：
解析：IEEE和ISO先后进行了LAN的标准化工作，涉及到四类不同信道访问控制方法和拓扑构形的网络，如表2-1所示。时隙方法的环型网来源于剑桥环(CambridgeRing)，只在ISO8802标准，而不在IEEEE802标准中。
分类：其他
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