下列关于路由器和交换机的描述中，错误的是（）

【名词&注释】

路由器(router)、交换机(switch)

[单选题]下列关于路由器和交换机的描述中，错误的是（）

A. 路由器可以用来连接internet
B. 二层交换机可以用来实现“异地网络”互连
C. 路由器可以用来做路径选择
D. 交换机可以转发广播

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学习资料：

[单选题]Which command on router EzonexamA will assign the last usable IP address from the 192.168.32.128/28 subnetwork to a router interface?

A. EzonexamA(config-if) ip address 192.168.32.142 255.255.255.240
B. EzonexamA(config-if) ip address 192.168.32.143 255.255.255.240
C. EzonexamA(config-if) ip address 192.168.32.158 255.255.255.240
D. EzonexamA(config-if) ip address 192.168.32.145 255.255.255.240
E. EzonexamA(config-if) ip address 192.168.32.144 255.255.255.240
F. F. EzonexamA(config-if) ip address 192.168.32.158 255.255.255.240
G. G. None of the above

[多选题]CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)

A. To determine the status of network services on a remote device
B. To obtain the IP Address of a connected device in order to telnet to the device
C. To verify the type of cable interconnecting two devices
D. To verify Layer 2 connectivity between two devices when Layer 3 fails
E. To obtain VLAN information from directly connected swticehs
F. F. To determine the status of the routing protocols between directly connected routers
G. G. To support automatic network failover during outages

[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的广播地址为（）

A. 192.168.50.32
B. 192.168.80.64
C. 192.168.50.96
D. 192.168.50.71

[单选题]The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence, what will happen?

A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.

[单选题]After logging into a router and typing in a few show commands, you press the up arrow key. What will this do?

A. It will recall the previous command line
B. It will move the cursor one line up
C. It will redisplay the current command line
D. It will capitalize the command line
E. None of the above

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