UDP: User Datagram Protocol

UDP: User Datagram Protocol

UDP is a connectionless, lightweight transport protocol. Unlike TCP, it does not guarantee delivery, ordering, or duplicate protection — but it is significantly faster.

UDP vs TCP

UDP Datagram Header

 0      15 16     31
+--------+--------+
| Src Port|Dst Port|
+--------+--------+
| Length  |Checksum|
+--------+--------+
|      Data       |
+-----------------+

The header is only 8 bytes: source port (2), destination port (2), length (2), and checksum (2).

Checksum

UDP uses a simple checksum to detect corruption. A basic checksum sums all bytes in the data and takes the result modulo 256.

Your Task

Implement createUDPDatagram(srcPort, dstPort, data) that creates a simulated UDP datagram object with:

• srcPort, dstPort, length (header 8 bytes + data length), checksum (sum of char codes mod 256), data

Also implement verifyChecksum(datagram) that returns true if the checksum is correct.