[单选题]标准访问控制列表应被放置的最佳位置是在()。
                                                             正确答案 :B
                    
                      
                                                                                                                                         越靠近数据包的目的地越好 
                                                                                                                                                            
                    
                                     [单选题]路由器下,由一般用户模式进入特权用户模式的命令是:()
                                                             正确答案 :A
                    
                      
                                                                                     enable 
                                                                                                                                                                                                                
                    
                                     [单选题]OSI七层模型中,“包”是哪一层数据封装的名称()
                                                             正确答案 :C
                    
                      
                                                                                                                                                                                             网络层 
                                                                                                        
                    
                                     [单选题]关于PPP和HDLC的说法中,错误的是()
                                                             正确答案 :D
                    
                      
                                                                                                                                                                                                                                                 在配置ISDN时,广域网协议不能封装成PPP,但可以封装成HDLC 
                                                    
                    
                                     [单选题]IP地址为:192.168.50.70,掩码为:255.255.255.248,则该IP和掩码结合,共划分了多少个子网(不包括全0子网和全1子网)()
                                                             正确答案 :B
                    
                      
                                                                                                                                         30 
                                                                                                                                                            
                    
                                     [多选题]在配置帧中继子接口时,在物理接口上应该配置的内容是:()
                                                             正确答案 :BCD
                    
                      
                                                                                                                                         封装帧中继协议 
                                                                                                                 指定子接口类型 
                                                                                                                 设定子接口 
                                                                                                        
                    解析:BCD
 
                                     [单选题]You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:o/r 0x2142
                                                             正确答案 :C
                    
                      
                                                                                                                                                                                             It is used to bypass the configuration in NVRAM. 
                                                                                                                                                                                                                
                    解析:解析:Explanation: 
                                     [单选题]You have just purchased a brand new router and wish to have the router prompt you through the initial configuration commands. Which router mode does this describe?
                                                             正确答案 :B
                    
                      
                                                                                                                                         SETUP mode 
                                                                                                                                                                                                                
                    解析:解析:Explanation: 
                                     [单选题]The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?
                                                             正确答案 :C
                    
                      
                                                                                                                                                                                             Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth 
                                                                                                                                                            
                    
                                     [多选题]Which of the following are types of flow control? (Choose three)
                                                             正确答案 :ACD
                    
                      
                                                                                     Buffering 
                                                                                                                                                                     Windowing 
                                                                                                                 Congestion avoidance 
                                                                                                        
                    解析:解析:Explanation:Datatransmissionflowcontroloccursatlayer4withthehelpofbuffering,windowingandcongestionavoidance. 
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