OSI七层模型中，物理层的数据封装名称为（）

【名词&注释】

路由器(router)、子网掩码(subnet mask)、物理层(physical layer)

[单选题]OSI七层模型中，物理层的数据封装名称为（）

A. 比特
B. 帧
C. 包
D. 段

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学习资料：

[单选题]常见的LSA有几种类型()

A. 4
B. 5
C. 6
D. 7

[单选题]某网络中，拟设计10子网，每个子网中放有14台设备，用IP地址段为199.41.10.X，请问符合此种规划的子网掩码是()

A. 255.255.255.0
B. 255.255.240.0
C. 255.255.255.240
D. 255.248.0.0

[单选题]路由器“路由模式”的提示符号是（）

B. (config)
C. (config-if)
D. (config-router)

[多选题]The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? (Choose two)

A. ARP
B. CDP
C. DHCP
D. DNS
E. ICMP

[单选题]The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?

A. 1 network with 254 hosts
B. 4 networks with 128 hosts
C. 2 networks with 24 hosts
D. 6 networks with 64 hosts
E. 8 networks with 36 hosts

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