السلام عليكم و رحمة الله و بركاته

لي سؤال :
ما معنى:
Switch0 and Switch1 - هنا:
الله يوفقكم جميع ويجزيكم كل خير
Router# show ip interface brief

Interface IP-Address OK? Method Status Protocol


GigabitEthernet1/1 unassigned YES NVRAM administratively down down


GigabitEthernet1/0 unassigned YES NVRAM administratively down down


Switch0
unassigned YES unset up up

Switch1
unassigned YES NVRAM up up

FastEthernet2/0 unassigned YES NVRAM administratively down down


FastEthernet2/1 unassigned YES NVRAM administratively down down