【名词&注释】
路由表(routing table)、可扩展性(scalability)、互联网(internet)、优先级(priority)、交换机(switch)、以太网(ethernet)、配置文件(configuration file)、模块化路由器(module router)
[单选题]下面对Cisco2621路由器和Cisco2501路由器描述中，错误的是（）
A. Cisco2621路由器的可扩展性优于Cisco2501路由器
B. Cisco2621是模块化路由器(module router)
C. Cisco2501上提供一个100Mbit/s的快速以太网(ethernet)端口
D. Cisco2501是固定端口的路由器
查看答案&解析
举一反三：
[单选题]路由器上，清空路由表的命令是（）
A. clear ip
B. delete ip route
C. delete route
D. clearip route*
[单选题]为了使配置私有IP的设备能够访问互联网，应采用的技术是()
A. NAT
B. VLAN
C. ACCESS-LIST
D. DDR
[单选题]要把交换机的配置文件(configuration file)保存到tftp服务器，应使用的命令为（）
A. copy ios tftp
B. copy running-configt ftp
C. copy flash tftp
D. copy config tftp
[多选题]What are two characteristics of "store and forward" switching? (Select two answer choices)
A. Latency fluctuates regardless of frame. size.
B. The switch receives the complete frame. before beginning to forward it.
C. Latency through the switch varies with frame. length.
D. The switch checks the destination address upon receipt of headers.
[单选题]在OSPF的DR/BDR选举过程中，在路由器有相同的接口优先级情况下，什么用于确定DR或BDR（）
A. 最高的OSPF进程ID
B. 最低的接口IP地址
C. 最低的接口开销
D. 路由器ID
[单选题]You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?
A. Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point link
B. Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive
C. Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
D. Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal
E. None of the above
[单选题]备份路由器IOS的命令是：()
A. copy flash tftp
B. copy running-configt ftp
C. copy IOS tftp
D. copy startup-configt ftp
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