21.
In a network with dozens of switches, how many root bridges would you have?

22.
What PPP protocol provides dynamic addressing, authentication, and multilink?

23.
What is a stub network?

24.
If your router is facilitating a CSU/DSU, which of the following commands do you need to use to provide the router with a 64000bps serial link?

25.
Which one of the following is true regarding VLANs?

26.
What does a VLAN do?

27.
What is the main reason the OSI model was created?

28.
How many collision domains are created when you segment a network with a 12-port switch?

29.
What command will display the line, protocol, DLCI, and LMI information of an interface?

30.
Which protocol does Ping use?