NET 121- Essentials of Networking

Questions for Chapters 11 and 12

1. What is a hosts file for?
   
   
2. How do you put a documentation line in a hosts file?
   
   
3. What would be in the first column of a data line in a hosts file?
   
   
   What would be in the second column?
   
   
   Must there be a third?
   
   
4. How is an lmhosts file different from a hosts file?
   
   
5. What is the name of the folder that a hosts file is usually found in?
   
   
6. What does a DNS server do?
   
   
7. What is a DNS resolver?
   
   
8. Explain what a top-level DNS domain is, using two examples.
   
   
9. How long can a domain name be?
   
   
   How long can any label in it be?
   
   
10. What is WINS?
    
    
    Does WINS do the same thing as DNS?
    
    
11. What is a firewall for in a network?
    
    
12. What decisions does a packet filtering firewall make?
    
    
    What aspect of the packet might the firewall look at to make its decision?
    
    
13. What would make a server "dual-homed"?
    
    
14. What makes a server "fortified"?
    
    
15. Why do some network addressing schemes require you to use Network Address Translation?
    
    
    
16. If a proxy server is providing NAT service, how many IP addresses should it have?