11.
Which protocol is commonly used for sending emails in Java Networking?

12.
In Java Networking, what is the purpose of the `HttpURLConnection` class?

13.
What is the primary use of the `DatagramSocket` class in Java Networking?

16.
In Java Networking, what is the purpose of the `DatagramPacket` class?

18.
What is the purpose of the `URLConnection` class in Java Networking?

19.
Which protocol is commonly used for file transfer in Java Networking?

20.
In Java Networking, what is the purpose of the `MulticastSocket` class?

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