【名词&注释】
路由器(router)、物理层(physical layer)、帧中继(frame relay)、数据链路层(data link layer)、快捷键(shortcut key)
[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(shortcut key)为（）
A. ctrl+b
B. ctrl+z
C. ctrl+c
D. ctrl+p
查看答案&解析
举一反三：
[单选题]PPP工作在OSI的哪一层（）
A. 物理层
B. 数据链路层
C. 网络层
D. 传输层
[多选题]You have just installed a new web server on the Ezonexam network. You are required to ensure that the web server is accessible from the Internet. The network uses private addressing, so an IP-to-registered address mapping is required.To do this, you enter the following command:
A. Ezonexam(config) ip nat inside source static 192.168.2.1
B. 198.18.1.254
C. You unsuccessfully try to ping the Internet from a PC host on the LAN. During the troubleshooting process, you enter the "show ip nat translations" command but the output is blank.
D. What is the most likely cause of the problem?
E. The keyword overload is missing from the command.
F. The NAT pool must be defined first.
G. An access list must be defined to create static NAT translations.
H. The interfaces must be configured for NAT.
I. None of the above
[单选题]关于帧中继的说法，正确的是（）
A. 速率最大为1Mbit/s
B. 不提供差错校验功能
C. 可以偷占带宽
D. 数据传输质量高于DDN
[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
[单选题]哪个ACL可允许主机10.220.158.10访问web服务器192.168.3.244()
A. access-list 101 permit tcp host 10.220.158.10 eq 80 host 192.168.3.224
B. access-list 101 permit tcp 10.220.158.10 0.0.0.0 host 192.168.3.224 0.0.0.0 eq 80
C. access-list 101 permit host 10.220.158.10 0.0.0.0 host 192.168.3.224 0.0.0.0 eq 80
D. access-list 101 permit tcp 10.220.158.10 0.0.0.0 host 192.168.3.224 eq 80
[单选题]RIP路由协议认为“网络不可到达”的跳数是：()
A. 8
B. 16
C. 24
D. 100
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