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Q11. – (Topic 4) 

What is true about the ntpdate command? 

A. It is the primary management command for the NTP time server. 

B. It updates the local system's date (i.e. day, month and year) but not the time (i.e. hours, minutes,seconds). 

C. It queries one or more NTP time servers and adjusts the system time accordingly. 

D. It sends the local system time to one or many remote NTP time servers for redistribution. 

E. It can be used by any user to set the user clock independently of the system clock. 

Answer:

Q12. – (Topic 6) 

Which of the following commands can be used to limit the amount of memory a user may use? 

A. umask 

B. usermod 

C. ulimit 

D. passwd 

E. chage 

Answer:

Q13. – (Topic 3) 

Which of the following fields are available in both the global /etc/crontab file as well as in user-specific crontab files? (Select TWO correct answers) 

A. Year 

B. Minute 

C. Username 

D. Command 

Answer: B,D 

Q14. – (Topic 5) 

Which of the following may occur as a consequence of using the command ifconfig? (Choose THREE correct answers.) 

A. New name servers may be added to the resolver configuration. 

B. Network interfaces may become active or inactive. 

C. The routing table may change. 

D. IP addresses may change. 

E. The system's host name may change. 

Answer: B,C,D 

Q15. – (Topic 5) 

Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose THREE correct answers.) 

A. 127.0.0.0/8 

B. 10.0.0.0/8 

C. 169.255.0.0/16 

D. 172.16.0.0/12 

E. 192.168.0.0/16 

Answer: B,D,E 

Q16. CORRECT TEXT – (Topic 5) 

Which command, depending on its options, can display the open network connections, the routing tables, as well as network interface statistics. (Specify ONLY the command without any path or parameters.) 

Answer: netstat, /bin/netstat, ss, /usr/bin/ss 

Q17. – (Topic 5) 

What is true regarding TCP port 23? 

A. Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used. 

B. Port 23 is the well known port for the SSH service which provides secure logins. 

C. Port 23 is the well known port for the rlogin service which is SSL secured by default. 

D. 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:

Q18. – (Topic 1) 

How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only? 

A. unset -v FOOBAR;./myscript 

B. set -a FOOBAR="";./myscript 

C. env -u FOOBAR./myscript 

D. env -i FOOBAR./myscript 

Answer:

Q19. CORRECT TEXT – (Topic 6) 

Which file contains a set of services and hosts that will be allowed to connect to the server by going through a TCP Wrapper program such as tcpd? (Specify the full name of the file, including path.)https://lh3.googleusercontent.com/-5cd-clmKnbk/AAAAAAAAAAI/AAAAAAAAADM/-SXesH19Ido/s46-c-k-no/photo.jpg 

Answer: /etc/hosts.allow 

Q20. – (Topic 3) 

Which command can be used to delete a group from a Linux system? 

A. groupdel 

B. groupmod C. groups 

D. groupedit 

Answer:

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