Nagios Network Monitoring Specialist
Certification Practice Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of Nagios in a network environment?
A. Database management
B. Software development
C. Network and system monitoring
D. Video streaming
Answer: C. Network and system monitoring
Rationale: Nagios is designed to monitor network devices, services,
applications, and system resources to ensure availability and performance.
2. Which protocol is most commonly used by Nagios to monitor network
devices?
,A. FTP
B. SMTP
C. SNMP
D. Telnet
Answer: C. SNMP
Rationale: Simple Network Management Protocol (SNMP) is widely used
for collecting information and monitoring network devices.
3. Which Nagios configuration object defines a monitored network
device?
A. Service
B. Contact
C. Command
D. Host
Answer: D. Host
Rationale: A host object represents a network device, server, router,
switch, or other monitored endpoint.
4. What does a "CRITICAL" state indicate in Nagios?
A. Everything is normal
B. Warning threshold exceeded
,C. A serious problem requiring immediate attention
D. Host is unreachable
Answer: C. A serious problem requiring immediate attention
Rationale: CRITICAL indicates a service or resource has crossed critical
thresholds and requires prompt action.
5. Which Nagios plugin checks network connectivity using ICMP?
A. check_http
B. check_dns
C. check_ping
D. check_tcp
Answer: C. check_ping
Rationale: check_ping uses ICMP echo requests to verify connectivity and
response times.
6. What is the default web interface used to access Nagios monitoring
information?
A. Apache Tomcat
B. IIS
C. Nginx Dashboard
D. Nagios Core Web Interface
, Answer: D. Nagios Core Web Interface
Rationale: Nagios provides a web interface for viewing host status, service
status, and reports.
7. Which file typically contains Nagios host definitions?
A. commands.cfg
B. contacts.cfg
C. hosts.cfg
D. cgi.cfg
Answer: C. hosts.cfg
Rationale: Host objects are commonly stored in hosts.cfg or similar
configuration files.
8. Which port is commonly used for SNMP communication?
A. 22
B. 80
C. 443
D. 161
Answer: D. 161
Rationale: UDP port 161 is the standard SNMP communication port.
Certification Practice Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of Nagios in a network environment?
A. Database management
B. Software development
C. Network and system monitoring
D. Video streaming
Answer: C. Network and system monitoring
Rationale: Nagios is designed to monitor network devices, services,
applications, and system resources to ensure availability and performance.
2. Which protocol is most commonly used by Nagios to monitor network
devices?
,A. FTP
B. SMTP
C. SNMP
D. Telnet
Answer: C. SNMP
Rationale: Simple Network Management Protocol (SNMP) is widely used
for collecting information and monitoring network devices.
3. Which Nagios configuration object defines a monitored network
device?
A. Service
B. Contact
C. Command
D. Host
Answer: D. Host
Rationale: A host object represents a network device, server, router,
switch, or other monitored endpoint.
4. What does a "CRITICAL" state indicate in Nagios?
A. Everything is normal
B. Warning threshold exceeded
,C. A serious problem requiring immediate attention
D. Host is unreachable
Answer: C. A serious problem requiring immediate attention
Rationale: CRITICAL indicates a service or resource has crossed critical
thresholds and requires prompt action.
5. Which Nagios plugin checks network connectivity using ICMP?
A. check_http
B. check_dns
C. check_ping
D. check_tcp
Answer: C. check_ping
Rationale: check_ping uses ICMP echo requests to verify connectivity and
response times.
6. What is the default web interface used to access Nagios monitoring
information?
A. Apache Tomcat
B. IIS
C. Nginx Dashboard
D. Nagios Core Web Interface
, Answer: D. Nagios Core Web Interface
Rationale: Nagios provides a web interface for viewing host status, service
status, and reports.
7. Which file typically contains Nagios host definitions?
A. commands.cfg
B. contacts.cfg
C. hosts.cfg
D. cgi.cfg
Answer: C. hosts.cfg
Rationale: Host objects are commonly stored in hosts.cfg or similar
configuration files.
8. Which port is commonly used for SNMP communication?
A. 22
B. 80
C. 443
D. 161
Answer: D. 161
Rationale: UDP port 161 is the standard SNMP communication port.
