LPIC-1 Exam 102 v5 (Linux Administrator) — Question 112

On a Linux workstation, the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?

Answer options

• A. The local routing information may be corrupted and must be re-validated using a routing protocol.
• B. One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout.
• C. There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.
• D. The Linux Kernel Routing Daemon (LKRD) is not running and should be started using its init script or systemd unit.
• E. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

Correct answer: E

Explanation

The correct answer is E because the route command attempts to resolve hostnames to IP addresses, and if DNS is not functioning, this can cause delays. Options A, B, C, and D do not directly relate to the command's delay as they pertain to routing data integrity, router availability, default router conflicts, and daemon status, respectively.