Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

Your monitoring team reports that large HTTPS file transfers keep failing after traffic is routed through a site-to-site IPSec VPN. A packet capture shows the server sending 1500-byte Ethernet frames while the VPN gateway returns ICMP "fragmentation needed" messages. Before changing any interface settings, you need to discover the largest packet that can traverse the entire path without fragmentation from the Linux server. Which command will let you verify that maximum unfragmented size?

  • ss -lnt | awk '{print $2}' to view MSS values on listening sockets

  • ethtool -S eth0 | grep drop to look for oversized-frame counters

  • ping -c 4 -M do -s 1472 203.0.113.10 and adjust the -s value downward until the echoes succeed

  • ip link set dev eth0 mtu 1400 && ping -c 4 203.0.113.10 to see if packets pass afterward

CompTIA Linux+ XK0-006 (V8)
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