Nagios Certified Administrator (Nca)
Exam Practice Questions And Correct
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Rationales 2026 Q&A | Instant
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1. What is the primary purpose of Nagios Core?
A. Database management
B. Network monitoring and alerting
C. Web hosting
D. File sharing
Answer: B
Rationale: Nagios Core is designed to monitor systems, networks, and
infrastructure services and send alerts when issues occur.
2. Which configuration file is the main Nagios Core config file?
A. httpd.conf
B. nagios.cfg
C. services.cfg
, D. hosts.cfg
Answer: B
Rationale: nagios.cfg is the primary configuration file controlling
Nagios Core behavior.
3. What does NRPE stand for?
A. Nagios Remote Plugin Executor
B. Network Routing Protocol Engine
C. Nagios Response Processing Engine
D. Network Remote Ping Executor
Answer: A
Rationale: NRPE allows execution of plugins on remote Linux/Unix
machines.
4. Which directory typically stores Nagios object configuration files?
A. /var/log/nagios
B. /etc/nagios/objects
C. /usr/local/nagios/bin
D. /home/nagios/config
Answer: B
Rationale: Object definitions such as hosts and services are stored in
/etc/nagios/objects.
5. What is the function of a Nagios plugin?
A. Store logs
B. Perform checks and return status
, C. Manage users
D. Configure Apache
Answer: B
Rationale: Plugins perform actual monitoring checks and return
status codes to Nagios.
6. Which status indicates a critical problem in Nagios?
A. OK
B. WARNING
C. UNKNOWN
D. CRITICAL
Answer: D
Rationale: CRITICAL indicates a service or host is down or severely
failing.
7. What port does NRPE typically use?
A. 80
B. 22
C. 5666
D. 443
Answer: C
Rationale: NRPE commonly uses TCP port 5666 for remote execution.
8. Which file defines hosts in Nagios?
A. services.cfg
B. contacts.cfg
, C. hosts.cfg
D. commands.cfg
Answer: C
Rationale: hosts.cfg contains definitions of monitored hosts.
9. What is the purpose of the Nagios web interface?
A. Compile plugins
B. View monitoring status and reports
C. Edit kernel settings
D. Manage DNS
Answer: B
Rationale: The web interface provides visualization of monitoring
data and alerts.
10. Which command verifies Nagios configuration?
A. nagios -v
B. nagios --check
C. nagios -test
D. nagios -verify-only
Answer: A
Rationale: nagios -v checks configuration files for errors before
restart.
11. What is a host in Nagios?
A. A service check
B. A monitored device or server
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of Nagios Core?
A. Database management
B. Network monitoring and alerting
C. Web hosting
D. File sharing
Answer: B
Rationale: Nagios Core is designed to monitor systems, networks, and
infrastructure services and send alerts when issues occur.
2. Which configuration file is the main Nagios Core config file?
A. httpd.conf
B. nagios.cfg
C. services.cfg
, D. hosts.cfg
Answer: B
Rationale: nagios.cfg is the primary configuration file controlling
Nagios Core behavior.
3. What does NRPE stand for?
A. Nagios Remote Plugin Executor
B. Network Routing Protocol Engine
C. Nagios Response Processing Engine
D. Network Remote Ping Executor
Answer: A
Rationale: NRPE allows execution of plugins on remote Linux/Unix
machines.
4. Which directory typically stores Nagios object configuration files?
A. /var/log/nagios
B. /etc/nagios/objects
C. /usr/local/nagios/bin
D. /home/nagios/config
Answer: B
Rationale: Object definitions such as hosts and services are stored in
/etc/nagios/objects.
5. What is the function of a Nagios plugin?
A. Store logs
B. Perform checks and return status
, C. Manage users
D. Configure Apache
Answer: B
Rationale: Plugins perform actual monitoring checks and return
status codes to Nagios.
6. Which status indicates a critical problem in Nagios?
A. OK
B. WARNING
C. UNKNOWN
D. CRITICAL
Answer: D
Rationale: CRITICAL indicates a service or host is down or severely
failing.
7. What port does NRPE typically use?
A. 80
B. 22
C. 5666
D. 443
Answer: C
Rationale: NRPE commonly uses TCP port 5666 for remote execution.
8. Which file defines hosts in Nagios?
A. services.cfg
B. contacts.cfg
, C. hosts.cfg
D. commands.cfg
Answer: C
Rationale: hosts.cfg contains definitions of monitored hosts.
9. What is the purpose of the Nagios web interface?
A. Compile plugins
B. View monitoring status and reports
C. Edit kernel settings
D. Manage DNS
Answer: B
Rationale: The web interface provides visualization of monitoring
data and alerts.
10. Which command verifies Nagios configuration?
A. nagios -v
B. nagios --check
C. nagios -test
D. nagios -verify-only
Answer: A
Rationale: nagios -v checks configuration files for errors before
restart.
11. What is a host in Nagios?
A. A service check
B. A monitored device or server
