Top 50 Nagios Interview Questions with Answers

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1) What is Nagios?
a) A network monitoring system
b) A database management system
c) A web server framework

Answer: a) A network monitoring system

2) Which protocol does Nagios use for monitoring?
a) SMTP
b) SNMP
c) FTP

Answer: b) SNMP

3) What is the main configuration file in Nagios?
a) nagios.cfg
b) nagios.conf
c) nagios.ini

Answer: a) nagios.cfg

4) How often does Nagios perform checks by default?
a) Every minute
b) Every 5 minutes
c) Every 15 minutes

Answer: b) Every 5 minutes

5) What is the command to verify the Nagios configuration files?
a) nagios -v
b) nagios -c
c) nagios -s

Answer: a) nagios -v

6) Which plugin is used for monitoring disk usage?
a) check_disk
b) check_cpu
c) check_memory

Answer: a) check_disk

7) Which plugin is used for monitoring network ports?
a) check_tcp
b) check_udp
c) check_http

Answer: a) check_tcp

8) What is the default port for Nagios web interface?
a) 80
b) 443
c) 8080

Answer: c) 8080

9) Which command is used to restart the Nagios service?
a) service nagios restart
b) systemctl restart nagios
c) restart nagios service

Answer: b) systemctl restart nagios

10) Which plugin is used for monitoring CPU usage?
a) check_cpu
b) check_memory
c) check_disk

Answer: a) check_cpu

11) Which plugin is used for monitoring memory usage?
a) check_memory
b) check_cpu
c) check_disk

Answer: a) check_memory

12) Which plugin is used for monitoring HTTP errors?
a) check_http
b) check_tcp
c) check_udp

Answer: a) check_http

13) Which plugin is used for monitoring ping response time?
a) check_ping
b) check_tcp
c) check_udp

Answer: a) check_ping

14) Which command is used to check the status of Nagios service?
a) service nagios status
b) systemctl status nagios
c) status nagios service

Answer: b) systemctl status nagios

15) Which file is used for defining host configurations in Nagios?
a) hosts.cfg
b) services.cfg
c) timeperiods.cfg

Answer: a) hosts.cfg

16) Which file is used for defining service configurations in Nagios?
a) services.cfg
b) hosts.cfg
c) timeperiods.cfg

Answer: a) services.cfg

17) Which plugin is used for monitoring DNS resolution?
a) check_dns
b) check_http
c) check_tcp

Answer: a) check_dns

18) Which plugin is used for monitoring SSH service?
a) check_ssh
b) check_scp
c) check_telnet

Answer: a) check_ssh

19) What is the command to check the version of Nagios?
a) nagios -v
b) nagios -V
c) nagios -version

Answer: b) nagios -V

20) Which plugin is used for monitoring MySQL database?
a) check_mysql
b) check_http
c) check_tcp

Answer: a) check_mysql

21) Which file is used for storing the log files in Nagios?
a) nagios.log
b) nagios.txt
c) nagios.dlog

Answer: a) nagios.log

22) Which plugin is used for monitoring Apache web server?
a) check_http
b) check_tcp
c) check_udp

Answer: a) check_http

23) Which plugin is used for monitoring FTP service?
a) check_ftp
b) check_sftp
c) check_tftp

Answer: a) check_ftp

24) Which file is used for defining time periods in Nagios?
a) timeperiods.cfg
b) hosts.cfg
c) services.cfg

Answer: a) timeperiods.cfg

25) What is the command to check the syntax of Nagios configuration files?
a) nagios -c
b) nagios -s
c) nagios -v

Answer: a) nagios -c

26) Which plugin is used for monitoring POP3 service?
a) check_pop
b) check_imap
c) check_smtp

Answer: a) check_pop

27) Which plugin is used for monitoring NFS service?
a) check_nfs
b) check_http
c) check_tcp

Answer: a) check_nfs

28) What is the command to check the status of Nagios services and hosts?
a) nagios -s
b) nagios -h
c) nagios -a

Answer: c) nagios -a

29) Which plugin is used for monitoring Active Directory service?
a) check_ad
b) check_ldap
c) check_http

Answer: b) check_ldap

30) Which file is used for defining contact groups in Nagios?
a) contactgroups.cfg
b) contacts.cfg
c) services.cfg

Answer: a) contactgroups.cfg

31) What is the command to check the uptime of a host in Nagios?
a) check_uptime
b) check_load
c) check_cpu

Answer: a) check_uptime

32) Which plugin is used for monitoring DNS server zones?
a) check_zone
b) check_dns
c) check_http

Answer: a) check_zone

33) What is the command to check the status of a specific service in Nagios?
a) check_service
b) check_status
c) check_snmp

Answer: c) check_snmp

34) Which plugin is used for monitoring PostgreSQL database?
a) check_postgres
b) check_mysql
c) check_http

Answer: a) check_postgres

35) Which file is used for defining command configurations in Nagios?
a) commands.cfg
b) services.cfg
c) timeperiods.cfg

Answer: a) commands.cfg

36) What is the command to check the network connectivity in Nagios?
a) check_network
b) check_snmp
c) check_ping

Answer: c) check_ping

37) Which plugin is used for monitoring NTP service?
a) check_ntp
b) check_http
c) check_tcp

Answer: a) check_ntp

38) What is the command to check the status of a specific host in Nagios?
a) check_host
b) check_status
c) check_cpu

Answer: a) check_host

39) Which plugin is used for monitoring Samba service?
a) check_samba
b) check_http
c) check_tcp

Answer: a) check_samba

40) Which file is used for defining hostgroup configurations in Nagios?
a) hostgroups.cfg
b) hosts.cfg
c) services.cfg

Answer: a) hostgroups.cfg

41) What is the command to check the status of a specific service group in Nagios?
a) check_servicegroup
b) check_status
c) check_snmp

Answer: a) check_servicegroup

42) Which plugin is used for monitoring RAID status?
a) check_raid
b) check_disk
c) check_cpu

Answer: a) check_raid

43) Which plugin is used for monitoring Windows services?
a) check_nt
b) check_snmp
c) check_http

Answer: a) check_nt

44) What is the command to check the free disk space in Nagios?
a) check_freedisk
b) check_memory
c) check_disk

Answer: c) check_disk

45) Which plugin is used for monitoring SSH logins?
a) check_sshlogin
b) check_ssh
c) check_telnet

Answer: a) check_sshlogin

46) Which file is used for defining servicegroup configurations in Nagios?
a) servicegroups.cfg
b) services.cfg
c) hosts.cfg

Answer: a) servicegroups.cfg

47) What is the command to check the network latency in Nagios?
a) check_latency
b) check_cpu
c) check_ping

Answer: a) check_latency

48) Which plugin is used for monitoring Exchange Server?
a) check_exchange
b) check_smtp
c) check_http

Answer: a) check_exchange

49) Which plugin is used for monitoring Oracle database?
a) check_oracle
b) check_mysql
c) check_http

Answer: a) check_oracle

50) Which file is used for defining user configurations in Nagios?
a) contacts.cfg
b) contactgroups.cfg
c) commands.cfg

Answer: a) contacts.cfg

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Ashwani Kumar

Sr. Software Engineer at Cotocus Private Limited

There is no end to education. It is not that you read a book, pass an examination, and finish with education. The whole of life, from the moment you are born to the moment you die, is a process of learning.