Within a local area network (LAN), there is a WINDOWS SERVER 2012 r2 system SERVER, IP address: 10.10.203.150, 255255255.0 versus 10.10.203.240, the other is a WINDOWS 7 computer IP address 10.10.210.150, 255.255.255.0, 10.10.210.240, according to the online before built on WINDOWS SERVER 2012 r2 SERVER wins SERVER can be conducted after the host name and IP address to each other, but still can't see on the net neighbor, network topology about:

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Among them, two layer 3 switches are among six lton-us period of layer 3 switches interconnected,