Linux Foundation LFCS Certification Exam Sample Questions

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Linux Foundation LFCS Sample Questions:

01. Which of the following kernel parameters instructs the kernel to suppress most boot messages?
a) nomesg
b) silent
c) verbose=0
d) quiet
 
02. What command can you use to view a summary status of your RAID arrays?
a) cat /proc/arrays
b) cat /dev/md0
c) cat /proc/mdstat
d) cat /dev/arrays
 
03. How do we format a partition as swap space?
a) sudo swapon --format /dev/vdb3
b) sudo swapon --verbose /dev/vdb3
c) sudo mkfs.swap /dev/vdb3
d) sudo mkswap /dev/vdb3
 
04. How do you tell the Apache HTTP server that the website files should be served from the /var/www/html directory?
a) DocumentRoot "/var/www/html"
b) ServerRoot "/var/www/html"
c) WebRoot "/var/www/html"
d) ServerName "/var/www/html"
 
05. On an SSH server you must limit each connection to at most four authentication attempts before it is dropped. Which sshd_config directive sets this?
a) LoginGraceTime 4
b) MaxSessions 4
c) MaxStartups 4
d) MaxAuthTries 4
 
06. In sshd_config you re-enable password authentication but must stop the root account from logging in over SSH by any method. Which directive blocks root SSH login?
a) AllowRootLogin no
b) PasswordAuthentication no
c) PermitRootLogin no
d) PermitRootLogin prohibit-password
 
07. You must enable X11 forwarding for all outgoing SSH connections from a host by editing the system-wide SSH client configuration. Which file and directive accomplish this?
a) X11Forwarding yes in /etc/ssh/sshd_config
b) X11Forwarding yes in /etc/ssh/ssh_config
c) ForwardX11 yes in /etc/ssh/sshd_config
d) ForwardX11 yes in /etc/ssh/ssh_config
 
08. To harden an SSH server you must stop it from accepting password-based logins, leaving only key-based authentication, then restart the service. Which sshd_config directive accomplishes this?
a) PasswordAuthentication no
b) PubkeyAuthentication no
c) ChallengeResponseAuthentication no
d) PermitRootLogin no
 
09. How can the normal output of a command be written to a file while discarding the error output?
a) command >2>file 1&>/dev/null
b) command < output > /dev/null
c) command > discard-error > file
d) command > /dev/null 2&>1 output
e) command >file 2>/dev/null
 
10. When using rpm --verify to check files installed from RPM packages, which of the following pieces of information is taken into consideration?
(Choose three.)
a) GnuPG signatures
b) Inodes
c) File sizes
d) MD5 checksums
e) Timestamps

Answers:

Question: 01
Answer: d		 Question: 02
Answer: c		 Question: 03
Answer: d		 Question: 04
Answer: a		 Question: 05
Answer: d
Question: 06
Answer: c		 Question: 07
Answer: d		 Question: 08
Answer: a		 Question: 09
Answer: e		 Question: 10
Answer: c, d, e

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