【名词&注释】
路由器(router)、交换机(switch)、数据包(packet)、物理层(physical layer)
[单选题]After connecting a PC to an available port on a switch, you find that the PC can not access any of the resources on the LAN. No other PC's connected to the switch appear to be having any issues. What is the most likely cause for this problem?
A. The router lacks a routing table entry for the new host
B. The host switch port is assigned to the incorrect VLAN
C. The host MAC address is incorrectly configured
D. A STP instance for the new host has not been initialized
E. The switch does not have the MAC address hard coded in the CAM table.
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举一反三：
[单选题]网关的功能（）
A. 过滤数据包
B. 不同网段通信
C. 校验数据帧
D. 把数据封装成“段”
[多选题]Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)
A. It uses inexpensive hubs
B. It operates without collisions
C. It operates on switches
D. It provides faster data transfer
E. It utilizes fewer wiring pairs
[多选题]请选出交换机处理帧的三种模式：()
A. 直通模式
B. 存储转发模式
C. 侦测模式
D. 分段模式
E. 阻塞模式
[单选题]路由器“路由模式”的提示符号是（）
B. (config)
C. (config-if)
D. (config-router)
[单选题]OSI七层模型中，物理层(physical layer)的数据封装名称为（）
A. 比特
B. 帧
C. 包
D. 段
[单选题]路由器上激活端口的命令是（）
A. shutdown
B. no shutdown
C. up
D. noup
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