UDP net

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1. What is a key characteristic of the User Datagram Protocol (UDP)?

• Connection-oriented
• Connectionless
• Guaranteed delivery
• Has flow control

Answer explanation

UDP operates without establishing a connection before data transfer.

2. According to the presentation, which application is best suited for UDP over TCP?

• Email transfer
• Web Browse
• Online gaming
• File transfers

Answer explanation

Online games prioritize speed and minimal latency over perfect reliability, which is UDP's main strength.

3. What is the size of the UDP header?

• 20 bytes
• 16 bytes
• 8 bytes
• 64 bytes

Answer explanation

The UDP header is minimal, containing just four fields that total 8 bytes.

4. Which statement accurately describes UDP's reliability?

• It guarantees packets arrive in order.
• It automatically retransmits lost packets.
• It provides no reliability guarantees; packets may be lost or duplicated.
• It uses acknowledgments to confirm delivery.

Answer explanation

Packets sent via UDP may be lost, duplicated, or arrive out of order with no built-in recovery mechanisms.

5. Which of the following is NOT a field in the UDP header?

• Source Port
• Acknowledgment Number
• Length
• Checksum

Answer explanation

The UDP header contains Source Port, Destination Port, Length, and Checksum. Acknowledgment Number is part of the TCP header.

6. What crucial mechanism, present in TCP, is absent in UDP?

• Port numbering
• Error-checking (Checksum)
• Congestion control
• Data encapsulation

Answer explanation

UDP has no mechanisms to detect network congestion or adjust its transmission rate accordingly.

7. How does a UDP server in Java typically create a socket to listen on a specific port?

• new DatagramSocket()
• new ServerSocket(port)
• new DatagramSocket(port)
• new Socket(address, port)

Answer explanation

A UDP server must bind to a specific port number to receive client messages.

8. In a Java UDP client, why is the port often omitted in the new DatagramSocket() constructor?

• The client does not need a port.
• To allow the system to assign an ephemeral port.
• The server assigns the port to the client.
• It defaults to port 80.

Answer explanation

A client socket typically doesn't bind to a specific port, allowing the system to assign a temporary (ephemeral) one.