1. Describe how the computers on each side of a session keep track of the status of the connection. 

2. Why do we use Domain Name System (DNS) instead of typing something like http://192.168.4.1.to open a Web page? 

3. Explain where names such as com, org, net, edu, gov, mil, biz, and int fit into the Internet’s Domain Name System (DNS) hierarchy. 

4. Explain why the Domain Name System (DNS) is considered to be a security issue. 

5. Describe Dynamic DNS, in terms of client and server registration? 

6. Describe Active Directory-integrated zones. 

7. In general terms, explain what happens when a router connection goes down on the Internet.