Yes
Yes
TRue
Modern networks used two devices for the data packets within the network will flow easily. The two devices are the routers and switches.
Routers support a variety of interface types. Switches typically support Ethernet interfaces.
Bridges, Switches and Routers will all separate collision domains.
Depends on how many switches each router takes. You need a router to connect all the other routers, and then enough switches to make 81. For example, you can use 6 16 port routers to connect the computers and 1 8 port router to connect those routers together
To stack routers means to physically stack routers. Some stack a couple of routers on top of each other if they plan to just use them as switches or similar.
routers and switches
hubs, switches or routers.
Like Cisco routers, most Cisco switches run IOS, and can be configured in a similar way. Older non-IOS switches still use the console port to configure them, just like the routers.
cabling
Routers, Switches, Cables, End devices .