1. List the frame type of CSMA/CD and describe each of them.
2. Expalin how does a proxy server works.
3. List three command used by FTP over control connection and explain it.
4. Both HTTP and FTP can be used for downloading and uploading files. Give one similarity and one difference between the two protocols.
5. What is the purpose of the IF-MODIFIED-SINCE field in an HTTP GET message?
6. if a client requests an URL but it does not know the IP Address. Explain how this problem in context of DNS solved.
7. What information is used by a process running on one host to identify a process running on another host?
8. Explain the DNS records and messages.
9. List the four broad classes of services that a transport protocol can provide. For each of the service classes, indicate if either UDP or TCP (or both) provides such a service
10. Consider an HTTP client that wants to retrieve a Web document at a given URL. The IP address of the HTTP server is initially unknown. Describe how doese the client retrieves the Web Document