Entry level and Help Desk Positions

These question are mostly for help desk positions but i wouldn't be surprised if an entry-level candidate was asked any one of these questions if you don't know the answer, find it, memorize it and then practice explaining it in your own words.

1. What is the difference between a hub and switch?

2. What is a network?

3. What is Active Directory?

4. What is TCP/IP and what does it stand for?

5. What is a default gateway?

6. what does DHCP stand for?

7. What is an IP address?

8. What is the significance of the IP address 255.255.255.255?

9. What are the 3 Major classes of an IP network?

10. What is a class D IP address?

11. What is OSPF?