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【单选题】
What is true about Cisco Discovery Protocol?A.
关于思科发现协议的描述哪个是正确的？
B.
it discovers the routers, switches and gateways.
C.
够发现了路由器，交换机和网关设备。
D.
it is network layer protocol
E.
网络层协议
F.
it is physical and data link layer protocol
G.
物理和数据链路层协议
H.
it is proprietary protocol
I.
专有协议。
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