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Linux Foundation LFCS Exam Questions
Linux Foundation Certified System Administrator (Page 3 )

Updated On: 16-Feb-2026
Page 3 of 53
PDF with 260 Questions

What is true regarding a default route?

  1. The default route is always used first. When the default route is not available more specific routes are tried.
  2. When a default route is set, all other routes are disabled until the default route is deleted.
  3. The default route is only used if there is not a more specific route to a destination host or network.
  4. Without a default route, no network communication even in directly attached networks is possible.

Answer(s): C



What is true regarding TCP port 23?

  1. Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.
  2. Port 23 is the well known port for the SSH service which provides secure logins.
  3. Port 23 is the well known port for the rlogin service which is SSL secured by default.
  4. Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

Answer(s): A



Which approach will provide a listing of the contents in a tar archive?

  1. Use the tar command with -t.
  2. Use the grep command.
  3. Use the find command.
  4. Use the zless command.
  5. Use the zlist command.

Answer(s): A



Which type of filesystem is created by mkfs when it is executed with the block device name only and without any additional parameters?

  1. ext2
  2. ext3
  3. ext4
  4. XFS
  5. VFAT

Answer(s): A



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

  1. The local routing information may be corrupted and must be re-validated using a routing protocol.
  2. 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.
  3. 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.
  4. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

Answer(s): D






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