Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A Linux web server that previously ran only IPv4 has just been given a global IPv6 address and the DNS administrator has added a matching AAAA record.

$ ip -6 addr show ens33
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
    inet6 2001:db8:100:20::50/64 scope global dynamic

$ ip -6 route show
2001:db8:100:20::/64 dev ens33 proto kernel metric 256 pref medium

Remote users now complain that the site pauses for several seconds before finally loading over IPv4. No packet filtering rules are dropping traffic. Which action on the server will best restore reliable dual-stack reachability without disabling IPv6?

  • Enable NAT66 on the interface to translate outbound IPv6 traffic to IPv4.

  • Add a default IPv6 route, e.g., ip -6 route add default via 2001:db8:100:20::1 dev ens33.

  • Delete the AAAA DNS record so clients connect with IPv4 only.

  • Lower IPv6 precedence in /etc/gai.conf so the server prefers IPv4 addresses.

CompTIA Linux+ XK0-006 (V8)
Troubleshooting
Your Score:
Settings & Objectives
Random Mixed
Questions are selected randomly from all chosen topics, with a preference for those you haven’t seen before. You may see several questions from the same objective or domain in a row.
Rotate by Objective
Questions cycle through each objective or domain in turn, helping you avoid long streaks of questions from the same area. You may see some repeat questions, but the distribution will be more balanced across topics.

Check or uncheck an objective to set which questions you will receive.

Wipe Score
Bash, the Crucial Exams Chat Bot
AI Bot