Khan Academy The Internet Practice Test

What information does a typical data packet contain?

A header with routing information and a payload with the actual data. Only the payload with no header. A list of connected devices. The password for the receiving site.

Correct Answer:

A header with routing information and a payload with the actual data.

Explanation:

Data is sent over networks in small chunks called packets, and each packet carries two main parts: a header and a payload. The header holds routing and control information that helps the network move the packet from the sender to the correct recipient, including addresses, sequencing data, and error-checking fields. The payload is the actual data you want to deliver, like part of a file or a piece of a web page. Without a header, routers wouldn’t know where to send the packet or how to reassemble the message, and without a payload there would be no useful data to deliver. Choices that suggest only the data or that include unrelated items (like a list of devices or a password) don’t describe how standard packets are structured.

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