You've captured network traffic using Wireshark and noticed many ARP requests. Which filter will display only ARP packets?

Question

BlackTom AI · Accepted Answer

When choosing a Wireshark display filter to isolate ARP traffic, you want a filter that matches the ARP protocol itself.
Option 1: 'protocol == ARP' — This is not the standard Wireshark syntax for filtering by protocol; Wireshark uses the protocol name directly (like 'arp') rather than 'protocol == ...'. As a result, this filter is unlikely to yield the expected ARP-only view.
Option 2: 'arp.request' — This filter would refine results to only ARP requests if supported, but it’s not the general ARP display filter for all ARP packets; it may miss ARP replies or behave inconsistently depending on the version or configuration.
Option 3: 'arp' — This is the canonical display filter in Wireshark to show all ARP packets, regardless of ARP operation (request or reply). It directly selects the ARP protocol and is widely recognized and supported.
Option 4: 'ip.proto == ARP' — This expression attempts to compare an IP layer field to ARP, which doesn’t make sense because ARP operates at the link layer and isn’t encapsulated as an IP protocol; thus this filter will not correctly isolate ARP traffic and may return no results or incorrect packets.
In summary, the straightforward and most reliable filter to display only ARP packets is the single token 'arp', since it explicitly selects the ARP protocol in Wireshark's display filter syntax.

4520_COMP_SCI_X_0006 Quiz 3

You've captured network traffic using Wireshark and noticed many ARP requests. Which filter will display only ARP packets?

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