What is the size of a MAC address?

What is the structure of a MAC address?

Two devices are in network if

1. a process in one device is able to exchange information with a process in another device
2. a process is running on both devices
3. the processes running of different devices are of same type
4. none of the mentioned

What is a standalone computer ?

1. A computer that is not connected to a network
2. A computer that is being used as a server
3. A computer that does not have any peripherals attached to it
4. A computer that is used by only one person