正确答案: D

应用层

题目：FTP工作在OSI哪一层（）

解析：D

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举一反三的答案和解析：

[单选题]通配符掩码和子网掩码之间的关系是（）。

两者没有什么区别

[单选题]On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?

Combining routes to multiple networks into one supernet.

解析：解析：Explanation:

[多选题]You need to describe the various types of flow control to your co-workers. Which of the following are types of flow control that can be used in a network? (Choose three)

Congestion avoidance

Windowing

Buffering

[单选题]A Ezonexam switch is configured with all ports assigned to VLAN 2. In addition, all ports are configured as full-duplex FastEthernet. What is the effect of adding switch ports to a new VLAN on this switch?

An additional broadcast domain will be created.

解析：解析：Explanation: