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

A. Never
B. Every 2 seconds
C. Every 10 minutes
D. Every 30 seconds

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

A. 1
B. 2
C. 5
D. 12

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

A. Set the Telnet password.
B. Shut down the router.
C. Set your console password.
D. Disable console connections.

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

A. show all access-lists
B. show access-lists
C. show ip interface
D. show interface

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

A. A
B. B
C. C
D. A and B