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                                                                                                                                                                       210.x.x.1                                                                                                                                   210.x.x.2                         
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                               web01                                                                                                                                       web02     
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                      172.x.x.1                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                                                                                     
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                           172.x.x.x/24                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                       172.x.x.1                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                     
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                                                                                                                                                                                                        db01                                                                                                                                    app01