[单选题]OSI七层模型中，“包”是哪一层数据封装的名称（）
正确答案 ：C
网络层
[单选题]基本IP访问权限表的表号范围是：()
正确答案 ：B
1-99
[单选题]关于静态NAT，下面（）说法是正确的。
正确答案 ：C
静态NAT将内部地址一对一静态映射到内部全局地址
[多选题]Using a subnet mask of 255.255.255.224, which of the IP addresses below can you assign to the hosts on this subnet? (Select all that apply)
正确答案 ：CDE
92.11.178.93
134.178.18.56
192.168.16.87
解析：C,D,E 解析：Explanation:
[单选题]路由器当前的模式为“端口模式”，要退回到“特权模式”，应该使用的快捷键为（）
正确答案 ：B
ctrl+z
[单选题]对交换机的描述，正确的是（）
正确答案 ：B
单广播域，多冲突域的设备
[多选题]Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)
正确答案 ：BDE
A jam signal informs all devices that a collision occurred.
The devices that are involved in the collision stops transmitting for a short time.
The collision invokes a random back-off algorithm.
解析：解析：Explanation:
[单选题]The Ezonexam corporate LAN consists of one large flat network. You decide to segment this LAN into two separate networks with a router. What will be the affect of this change?
正确答案 ：D
It will prevent segment 1's broadcasts from getting to segment 2.
解析：解析：Explanation
[多选题]The Ezonexam network administrator wants to ensure that only a single web server can connect to pot Fa0/1 on a catalyst switch. The server is plugged into the switch's Fast Eth. 0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of this server is allowed by switch port Fa0/1? (Choose two)
正确答案 ：BD
Configure the MAC address of the server as a static entry associated with port Fa0/1
Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server
解析：解析：Explanation:
[多选题]Ezonexam is migrating to a private IP addressing scheme. Which of the following describe the use of private IP addresses? (Choose two)
正确答案 ：BD
Addresses that cannot be routed through the public Internet.
A scheme to conserve public addresses.
解析：解析：Explanation:
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