[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]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()
                                                             正确答案 :D
                    
                      
                                                                                                                                                                                                                                                 192.168.50.71 
                                                    
                    
                                     [单选题]下列关于路由器和交换机的描述中,错误的是()
                                                             正确答案 :D
                    
                      
                                                                                                                                                                                                                                                 交换机可以转发广播 
                                                    
                    
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