Which filter shows only SMTP and ICMP traffic on Wireshark?

'tcp.eq 25' is not valid display filter syntax because 'tcp' is a protocol identifier and does not support a direct 'eq' comparison operator without a field name.

In Wireshark display filter syntax, 'tcp.port' is the correct field name to match TCP packets by source or destination port, and 'eq 25' specifies port 25 used by SMTP. The 'or' logical operator correctly combines this with the 'icmp' protocol filter so that packets matching either condition are displayed. This syntax adheres to Wireshark's display filter language, which differs from its capture filter (BPF) syntax.

'port eq 25' is BPF capture filter syntax and is invalid as a Wireshark display filter; additionally, 'and' would require a packet to satisfy both conditions simultaneously, excluding pure SMTP or pure ICMP packets.

'also' is not a valid logical operator in Wireshark display filter syntax; the correct boolean operator to combine two conditions is 'or'.