1- Explain the sevices supported by DNS 2- if a client requests an URL but it does not know the IP Address. Explain how this problem in context of DNS solved. 3- What is the difference between network architecture and application architecture? 4- What information is used by a process running on one host to identify a process running on another host? 5- Explain the DNS records and messages. 6- 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 7- Is it possible for an organizations Web server and mail server to have exactly the same alias for a hostname (for example, foo.com)? What would be the type for the RR that contains the hostname of the mail server? 8- 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 retrieve the Web Document