Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A Linux host will act as a router between two classroom VLANs. You enabled forwarding with:

# sysctl -w net.ipv4.ip_forward=1

Traffic now routes correctly; however, after every reboot the setting reverts to 0. Using only the native sysctl mechanism (no firewall or network-script tweaks), which command sequence both activates IPv4 forwarding immediately and guarantees it remains enabled across future boots?

  • echo 1 > /proc/sys/net/ipv4/ip_forward && iptables-save > /etc/iptables/rules.v4

  • iptables -t nat -A POSTROUTING -j MASQUERADE && service iptables save

  • firewall-cmd --permanent --add-masquerade && firewall-cmd --reload

  • echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf && sysctl -p

CompTIA Linux+ XK0-006 (V8)
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