User Datagram Protocol (UDP)

How large is the UDP header?

8 bytes.

What is UDP?

A protocol for fast, connectionless data delivery without guaranteeing delivery or order.

What is a datagram in UDP?

A single UDP packet sent from source to destination.

Name some common UDP applications.

Live video streaming, online gaming, DNS lookups, and VoIP calls.

Does UDP perform error checking and recovery like TCP?

No, it only has a minimal checksum for basic error detection.

Is UDP stateful or stateless?

Stateless.

Which OSI layer does UDP operate at?

Transport layer (Layer 4).

How is UDP different from TCP?

UDP is faster, simpler, connectionless, and does not guarantee delivery.

How does UDP identify which application to send data to?

Using source and destination port numbers in its header.

Why use UDP instead of TCP?

When speed is more important than perfect reliability.

Can UDP packets arrive out of order or get lost?

Yes, packets may be lost, duplicated, or arrive out of order.

Why is UDP called "fire-and-forget"?

Because it sends data without checking if the recipient received it.

What does connectionless mean in UDP?

Data is sent without setting up a special connection first.