DotCom Limited is currently experiencing serious fi nancial diffi culties and the directors have realised that the company will not be able to pay its debts during the next few months. As DotCom Limited should be able to recover its fi nancial stability within the short term, its advisors have informed the directors of DotCom Limited that the company may apply for corporate recovery in terms of the Companies Act, 1995.Required:

(b) Explain the role of the special controller in such a procedure. (5 marks)

下列选项中，关于集线器的描述，不正确的是( )。

A．多集线器级联结构由一个基础集线器与多个扩展集线器组成
B．无论是堆叠式集线器结构或是多集线器级联结构，局域网中所有的结点都处于同一个冲突域中
C．堆叠式集线器适用于中、小型企业网环境，多集线器级联结构适用于大型企业网环境
D．尽管以太网的数据传输速率从10Mbit/s发展到10Gbit/s，但它们在MAC层仍采用CSMA/CD方法，帧结构也没有变化，改变的只是相应的物理层协议