The LAN needs are expanding at the Testking corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the TestKing network.Which of the following are layer 1 devices that you can use?（）
- A、A switch.
- B、A router.
- C、A network adapter card.
- D、A hub.
- E、A repeater.
正确答案:D,E
答案解析:有
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