[单选题]RIP路由协议认为“网络不可到达”的跳数是:()
                                                             正确答案 :B
                    
                      
                                                                                                                                         16 
                                                                                                                                                            
                    
                                     [单选题]路由器上,清空路由表的命令是()
                                                             正确答案 :D
                    
                      
                                                                                                                                                                                                                                                 clearip route* 
                                                    
                    
                                     [单选题]At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?
                                                             正确答案 :D
                    
                      
                                                                                                                                                                                                                                                 Data link 
                                                                                                        
                    解析:解析:Explanation: 
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