Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

Intermittent connectivity issues have been reported on a flat /24 network. The Linux monitoring host's journalctl log shows repeated messages such as:

kernel: arp: 192.168.10.20 is-at 00:50:56:aa:bb:cc detected duplicate address

The storage server at 192.168.10.20 should have the fixed hardware address 00:25:90:01:02:03, so the administrator suspects that another machine is spoofing the server's MAC. She needs a lightweight, agentless tool she can run on her monitoring VM that will passively watch ARP traffic, keep a history of IP-to-MAC bindings, and automatically email her whenever a different MAC appears for a known IP. Which package best meets these requirements with the least additional scripting?

  • Add an iptables LOG rule that matches -m mac --mac-source 00:25:90:01:02:03 on the gateway.

  • Schedule arping -D in a cron job to probe the server's IP every minute.

  • Run tcpdump with ether host 00:25:90:01:02:03 and process the capture with logrotate.

  • Install and enable the arpwatch service to log ARP changes and send email alerts.

CompTIA Linux+ XK0-006 (V8)
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