Display filters are applied post-capture to the entire set of collected packets. Their primary advantage over capture filters is their non-destructive nature. They merely hide packets that do not match the filter criteria, without deleting them from the capture file. This allows an analyst to apply, remove, or modify filters iteratively to examine different data subsets within the same capture file. Packets hidden by one filter can be instantly brought back into view by changing or clearing the filter. In contrast, capture-time filters permanently discard packets that do not match the criteria during the capture process, and this data is unrecoverable for later analysis.

A. Both capture and display filters allow for focused analysis by isolating packets of interest from a larger traffic stream.

B. Both filter types can be saved as expressions and reused for subsequent analysis sessions or new captures in most protocol analyzers.

D. Both filter types support complex logical expressions (using AND, OR, NOT) to apply multiple conditions simultaneously.

1. Coleman, D. D., Westcott, D. A., & Harkins, D. (2021). CWAP Certified Wireless Analysis Professional Study Guide: Exam CWAP-404 (3rd ed.). Wiley. In Chapter 2, "Protocol Analysis," the text distinguishes between the two filter types, noting that capture filters are used to "reduce the size of the capture file by discarding unwanted frames," while display filters "simply hide frames from view, and they can be unhidden later."

2. Wireshark Development Team. (n.d.). Wireshark User's Guide. Wireshark.org. In Chapter 6, "Filtering Packets," Section 6.2, "Capture vs. Display Filters," it is explicitly stated: "A display filter... does not discard any packets. When you change the display filter, all packets will be back again." This contrasts with capture filters, which are described as discarding packets permanently.

3. Kurose, J. F., & Ross, K. W. (2021). Computer Networking: A Top-Down Approach (8th ed.). Pearson. The accompanying Wireshark Labs for the textbook demonstrate this principle. For instance, in the "Getting Started" lab, students are shown how display filters can be changed "on the fly" to view different protocols, while capture filters are set before capture and determine what data is saved to the file.