Such is as shown in figure network topology is a media company you work at ordinary times is watching the video clip of these each router is done with telecom upward of 100 m 1000 m network switches below 20 computer gateway to specify a router address because of cost savings is to use the telecom given that routers are made well before one day have a export after a broken network card intermittent has four CARDS have three export normal PING are normal I thought that was caused by radio too much on the convergence switch single export rowed a VLAN of each network isolation now but still the four CARDS that three export normal changed the router is the same feeling is the issue of telecom telecom to change my cat or no problem ask them backstage room data are normal I also don't understand the pay-off past again do port gathering will better now pay-off difficulty big bosses give some ideas