tcpdump is a command-line tool that can capture and analyze network packets from a given interface or file.
The -n option prevents tcpdump from resolving hostnames, which can speed up the analysis. The -r option reads packets from a file, in this case packets.pcap. The host [IP address] filter specifies that tcpdump should only display packets that have the given IP address as either the source or thedestination. This command can help the security analyst detect connections to a suspicious IP address by collecting the packet captures from the gateway. Official References:
* https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives
* https://www.techtarget.com/searchsecurity/quiz/Sample-CompTIA-CySA-test-questions-with-answers
* https://www.reddit.com/r/CompTIA/comments/tmxx84
/passed_cysa_heres_my_experience_and_how_i_studied/