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?