<span>If a DNS packet using UDP is lost this problem must be handled at the application layer. If an answer is not received after some period of time the specific application may choose to resend the DNS query. I can go much more into detail but this should answer your question. If you need more detail just ask.</span>
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Answer:
<em>Source port numbers and Destination </em>
Explanation:
Sockets are also <em>known as the source and destination IP addresses are combined with the source and destination port numbers. </em>
The socket is used to define the client's request for server and network.
Thousands of hosts are communicating with millions of separate servers every day.