[单选题]On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)
                                                             正确答案 :C
                    
                      
                                                                                                                                                                                             The hosts will attempt to resume transmission after a time delay has expired. 
                                                                                                                                                                                                                
                    解析:C 解析:Explanation: 
                                     [单选题]两台路由器直连到一起,应该使用的线缆为()
                                                             正确答案 :A
                    
                      
                                                                                     交叉线缆 
                                                                                                                                                                                                                
                    
                                     [单选题]路由器上的命令“show version”的功能是()
                                                             正确答案 :A
                    
                      
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