16.
How often are BPDUs sent from a layer 2 device?

17.
How many broadcast domains are created when you segment a network with a 12-port switch?

18.
What does the command routerA (config) #line cons 0 allow you to perform next?

19.
Which router command allows you to view the entire contents of all access lists?

20.
Which class of IP address has the most host addresses available by default?