What is a packet and what happens to it on a network?

• A. A packet is a large continuous stream of data that remains always in order without routing.
• B. A packet is a type of network physical cable.
• C. A packet is a security certificate used during TLS.
• D. A packet is a small chunk of data that is transmitted through a network; it travels via routers and links to its destination.

Answer: (D)

In networking, data is broken into small pieces called packets. Each packet carries a portion of the message plus a header with addressing and control information so it can be delivered correctly. These packets travel from the source to the destination by moving through links and routers. Routers read where the packet should go and forward it along the best path, which means packets can take different routes and may arrive out of order. The receiving system reassembles the packets into the original message, and if any packets are lost, they can be retransmitted. This is why data doesn’t just travel as one big, continuous stream that never routes or changes path.

The other options aren’t accurate: a packet isn’t a large continuous stream that stays in order without routing, nor is it a physical cable, nor a TLS security certificate.