router
No, wireless connections can't provide enough power for a TV.
any device in the collision domain whose backoff timer expires first
toast
A layer 1 device will extend a collision domain
Hubs are not collision domains but a networking device. Hubs have single collision domain that makes them very undesirable for modern networks.
switches
Hubs do not reduce collision domains. All devices connected to the hub are in a single collision domain, where as on a switch, each port is its own collision domain.
Bridge, Switches, Router.
port replicator
No- A VLAN is a single broadcast domain. If the VLAN uses a hub, which essentially connects all devices on a single wire, the the VlAN would be a collision domain. However hubs are rarely seen these days. A network switch keeps every device separated on individual collision domains so every device is kept from colliding with any other device.
The command would be show connections.
A Router