[单选题]通配符掩码和子网掩码之间的关系是()。
                                                             正确答案 :A
                    
                      
                                                                                     两者没有什么区别 
                                                                                                                                                                                                                
                    
                                     [单选题]OSPF在同一区域内,下列说法正确的是()
                                                             正确答案 :B
                    
                      
                                                                                                                                         每台路由器的LSDB(链路状态数据库)都是相同的 
                                                                                                                                                            
                    
                                     [单选题]路由器上的命令“show version”的功能是()
                                                             正确答案 :A
                    
                      
                                                                                     显示版本信息 
                                                                                                                                                                                                                
                    
                                     [单选题]OSI七层模型中,物理层的数据封装名称为()
                                                             正确答案 :A
                    
                      
                                                                                     比特 
                                                                                                                                                                                                                
                    
                                     [多选题]请选出交换机处理帧的三种模式:()
                                                             正确答案 :ABE
                    
                      
                                                                                     直通模式 
                                                                                                                 存储转发模式 
                                                                                                                                                                                                                         阻塞模式 
                                                    
                    解析:ABE
 
                                     [单选题]为了连接“帧中继”线路,网络中的路由器需要提供的端口类型为()
                                                             正确答案 :B
                    
                      
                                                                                                                                         Serial 
                                                                                                                                                            
                    
                                     [多选题]With regard to Ethernet media access methods, which of the following are true?(Choose all that apply.)
                                                             正确答案 :BC
                    
                      
                                                                                                                                         A device listens and waits until the media is not busy before transmitting. 
                                                                                                                 All devices on an Ethernet segment see data that passes on the network medium. 
                                                                                                                                                            
                    解析:解析:Explanation: 
                                     [单选题]Assuming you build networks to exact specifications, what is the recommended maximum length a 10BaseT cable can be before it has to be segmented or repeated?
                                                             正确答案 :A
                    
                      
                                                                                     100 meters 
                                                                                                                                                                                                                                                                    
                    解析:解析:Explanation: 
                                     [单选题]A new Ezonexam switch is installed into an existing LAN and a new VTP trunk is set up with an existing switch. Which VLANs will be allowed on this new trunk?
                                                             正确答案 :A
                    
                      
                                                                                     All defined VLANs are allowed on the trunk by default. 
                                                                                                                                                                                                                                                                    
                    解析:解析:Explanation: 
                                     [多选题]Which of the following steps are necessary in order to add a new VLAN to the Ezonexam switched network? (Select all that apply)
                                                             正确答案 :ABD
                    
                      
                                                                                     Create the VLAN. 
                                                                                                                 Name the VLAN. 
                                                                                                                                                                     Add the desired ports to the new VLAN. 
                                                                                                        
                    解析:解析:Explanation: 
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