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==== Pregunta 1 ====
What method of checking is initiated by the monitoring system to collect data?
 * Metric
 * Passive check
 * Alert
 * **Active check**

* Explicación general: An active check is also called the "pull method" of data collection, where the monitoring backend or server initiates collection of metrics values and status info, either using its agents or not.

==== Pregunta 2 ====
What are two benefits of proactive monitoring?
* Set thresholds for metrics
* **Avoid outages, optimize systems**
* Integrations provide metrics
* Easy to write custom plugins
  * Explicación general:
    1. Avoid outages - By rolling out monitoring solutions before issues occur, proactive monitoring can report on system health and warn of impending problems. This allows teams to take steps to avert issues and avoid outages.
    2. Optimize systems and meet goals - Proactive monitoring provides comprehensive visibility so teams can fine-tune application systems, infrastructure, and business processes. This helps organizations continuously optimize operations and ensure goals are on track.

==== Pregunta 3 ====
Splunk specializes in what type of monitoring?
* Specialized log aggregation
* Infrastructure monitoring
* General purpose SaaS
* Business monitoring
  * Explicación general: Splunk indexes and searches logs to provide insights and set alerts based on log data.

==== Pregunta 4 ====
How can custom metrics be viewed in Datadog after publishing?
* Trace Explorer
* Log Explorer
* Cassandra Explorer
* **Metrics Explorer**
  * Explicación general: The Metrics Explorer allows you to search for metrics by name, filter by tags, select a time range and aggregation method. This makes it very easy to find and visualize the custom metrics.

==== Pregunta 5 ====
What does Business monitoring provide early feedback on?
* **Progress towards business goals**
* Application functionality
* Infrastructure health
* Security threats
  * Explicación general: Business monitoring checks that business goals and key performance indicators (KPIs) are being met, gives an early indication of whether strategies need adjustment or applications/processes could help, and works alongside BI analysis to optimize operations and strategy.

==== Pregunta 6 ====
What does security monitoring check for?
* Infrastructure problems
* **Vulnerabilities and threats**
* Application issues
* Business metrics

==== Pregunta 7 ====
What are some examples of metrics that monitoring tools collect?
* **Disk space, memory, SSL expiration**
* Severity levels
* Events
* Up/down status

==== Pregunta 8 ====
What kind of monitoring tool is Nagios?
* **Popular first generation, open source**
* Specialized application performance
* Specialized log aggregation
* General purpose SaaS
  * Explicación general: Nagios is an on-premises, open-source monitoring solution that is well suited for infrastructure and system monitoring.

==== Pregunta 9 ====
What does Catchpoint monitor?
* Business KPIs
* Infrastructure
* App code
* **External application accessibility**

==== Pregunta 10 ====
What is the difference between an alert and a notification?
* Notification contains more details
* No difference
* Alert is manual, notification automated
* **Notification is part of alert, alert triggers actions**

==== Pregunta 11 ====
What command checks if the SNMP daemon is running on Ubuntu?
* sudo snmpd status
* **sudo /etc/init.d/snmpd status**
* sudo service snmpd status
* sudo systemctl status snmpd

==== Pregunta 12 ====
What process is used to collect metric values periodically for time-series data?
* Integration
* Monitor
* Threshold
* **Check**
  * Explicación general: Checks are used by monitoring systems to collect the value of metrics at regular intervals.

==== Pregunta 13 ====
What command tests SNMP connectivity on localhost?
* datadog-agent jmx list localhost
* **snmpwalk -v2c -cpublic localhost**
* jmxtool localhost
* snmpget -v2c -cpublic localhost

==== Pregunta 14 ====
Which support level would product support be?
* **L1**
* None
* L3
* L2

==== Pregunta 15 ====
What does Application monitoring help to check?
* Monitoring infrastructure
* Business goals are met
* **Application is functioning correctly**
* Health of infrastructure

==== Pregunta 16 ====
What are the three levels of on-call support?
* Warning, critical, informational
* Active, passive, hybrid
* External, internal, security
* **L1 product support, L2 SREs, L3 engineers**
  * Explicación general: L1 support responds using runbooks, L2 SREs triage infrastructure/software issues, L3 engineers handle unknown issues.

==== Pregunta 17 ====
What provides steps for on-call staff to respond to alerts?
* Severity Level
* Downtime
* **Runbook**
* Threshold
  * Explicación general: Runbooks outline procedures for on-call personnel to respond to alerts in Datadog.

==== Pregunta 18 ====
What type of monitoring focuses on servers, storage, load balancers, etc?
* **Infrastructure monitoring**
* Application monitoring
* Business monitoring
* Platform monitoring

==== Pregunta 19 ====
What is the main SNMP configuration file edited on Ubuntu?
* /etc/jmxtool.conf
* **/etc/snmp/snmp.conf**
* /etc/datadog.conf
* /etc/snmpd.conf

==== Pregunta 20 ====
What command-line tool is commonly used to scan SNMP-enabled devices?
* **snmpwalk**
* curl
* jmxtool
* snmpget
  * Explicación general: snmpwalk is used to scan SNMP-enabled devices for performance metrics.

==== Pregunta 21 ====
What does Catchpoint/Apica provide?
* Log aggregation
* Infrastructure monitoring
* APM
* **"Last mile" monitoring from locations**
  * Explicación general: Catchpoint and Apica monitor from end-user perspectives, checking external application accessibility and performance.

==== Pregunta 22 ====
What port does DogStatsD listen on by default?
* **8125**
* 8080
* 7199
* 2003

==== Pregunta 23 ====
In what way is a notification from an alert?
* The warning when a threshold is crossed
* A time window when alerting is disabled
* Published details about system changes
* **It's a message sent as part of an alert**
  * Explicación general: A notification is a message sent as part of an alert, which triggers actions like emails or updates.

==== Pregunta 24 ====
What technology allows Java applications to expose metrics?
* HTTP
* **JMX**
* SNMP
* StatsD
  * Explicación general: JMX allows Java applications to expose operational metrics.

==== Pregunta 25 ====
What file stores metrics collected by the SNMP agent?
* conf.yaml
* **Management Information Base (MIB)**
* metrics.csv
* snmp.log
  * Explicación general: MIB stores the metrics retrieved by the SNMP agent from managed devices.

==== Pregunta 26 ====
Which monitoring topology has the infrastructure in data centers but the monitoring backend in the cloud?
* Multiple Data Centers
* **Data Center with Cloud Monitoring**
* Single Data Center
* All in Cloud with In-House Monitoring

==== Pregunta 27 ====
What aspect of monitoring focuses on checking software system health to determine availability and detect deterioration early?
* Overview of monitoring tools
* **Primary focus**
* Key aspects
* Types of monitoring
  * Explicación general: The primary focus of monitoring is to track software system health to detect deterioration early.

==== Pregunta 28 ====
What technology allows publishing custom metrics to Datadog?
* JMX
* **DogStatsD**
* Apache Cassandra
* SNMP
  * Explicación general: DogStatsD is used for publishing custom metrics to Datadog.

==== Pregunta 29 ====
What does the "TICK" stack include?
* **Telegraf, InfluxDB, Chronograf, Kapacitor**
* Datadog, AppDynamics, Catchpoint, Apica
* Tick, Tock, Click, Clack
* Nagios, Zabbix, Splunk, Elasticsearch
  * Explicación general: The TICK stack includes tools for generating, storing, visualizing, and alerting on time-series data.

==== Pregunta 30 ====
What protocol is used to monitor network devices like routers and switches?
* SMTP
* **SNMP**
* HTTP
* JMX
  * Explicación general: SNMP is used to monitor network devices and collect metrics.

==== Pregunta 31 ====
An up/down status refers to what kind of measurement?
* Time-bound measurement providing insight
* Details about changes to a system
* **Binary status like process/website up/down**
* Warnings when metrics breach thresholds
  * Explicación general: Up/down status tracks the binary state of system components.

==== Pregunta 32 ====
What does Infrastructure monitoring focus on?
* Business KPIs
* Application code and services
* Security threats
* **Health of infrastructure components**

==== Pregunta 33 ====
What would you do during a downtime window?
* Resolve the underlying issue
* **Disable alerting temporarily**
* Create a runbook
* Enable additional alerting