[多选题]As the Ezonexam network administrator, you are required to have a firm understanding of the OSI model. Why does the data communication industry use the layered OSI reference model? (Choose two)

正确答案 ：BC

It encourages industry standardization by defining what functions occur at each layer of the model

It divides the network communication process into smaller and simpler components; thus aiding component development, design and troubleshooting

解析：解析：Explanation:

[单选题]VLAN主干协议VTP的默认工作模式是()

正确答案 ：A

服务器模式

[多选题]Which of the following are types of flow control? (Choose three)

正确答案 ：ACD

Buffering

Windowing

Congestion avoidance

解析：解析：Explanation:Datatransmissionflowcontroloccursatlayer4withthehelpofbuffering,windowingandcongestionavoidance.

[单选题]When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?

正确答案 ：D

when every operating switch port is in either the blocking or forwarding state

解析：解析：Explanation:

[单选题]配置路由器时，封装PPP协议的命令是：()

正确答案 ：A

encap ppp

[单选题]两个VLAN之间要想通信，应该使用的设备是（）

正确答案 ：C

路由器

[多选题]请选出交换机处理帧的三种模式：()

正确答案 ：ABE

直通模式

存储转发模式

阻塞模式

解析：ABE

[单选题]SMTP工作在OSI哪一层（）

正确答案 ：D

应用层

[单选题]关于帧中继的说法，正确的是（）

正确答案 ：C

可以偷占带宽

[多选题]Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)

正确答案 ：BD

Half-duplex Ethernet uses a loopback circuit to detect collisions.

Full-duplex Ethernet makes use of two pairs of wires for data.

解析：解析：Explanation:

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