10-What information is used by a process running on one host to identify a process running on another host? 11-Explain the DNS records and messages 13- 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 14-Is it possible for an organization's Web server and mail server to have exactly the same alias for a hostname (for example, foo.com? What ould be the type for the RR that contains the hostname of the mail server? 5 15-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