2. The adjacent equipment exchange machine is still within the unified a wide materials there on her knees, that is to say, don't deter a distance radio communication machine (the only exception is in case with a VLAN).

3. According to the frame header information exchange machine into overlooking a spleen, is said communication machine is working in the collection of the data link layer device (described here only refers to the traditional exchange machine communication equipment) on the second floor.