What is the primary purpose of the Decode As feature in Wireshark?

• A. Force dissection as a chosen protocol when the default identification is incorrect
• B. Filter traffic by host IP
• C. Show the raw hex and ASCII representation
• D. Enable HTTP reassembly for chunked content

Answer: (A)

Decode As lets Wireshark override how it dissects a packet. Normally, Wireshark picks a protocol dissector based on its automatic identification, which considers port numbers, signatures, and other cues. When that automatic identification is wrong—such as when traffic uses an unusual port, a custom protocol, or payloads that look like something else—you can force Wireshark to treat the frame as a specific protocol. Applying this override makes Wireshark run that protocol’s dissector for the packet (or for all packets on that port), so the fields, lengths, and structure become visible and correctly interpreted. This helps you see meaningful data and perform accurate analysis rather than looking at opaque raw bytes.

Other options describe different features: filtering by IP, viewing raw hex, or enabling HTTP reassembly, none of which are the purpose of Decode As.