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Question 181. What is an AOS-CX checkpoint?

1. A firmware image
2. A saved configuration state
3. A VLAN database
4. A log server

Correct Answer: 2. A saved configuration state

Explanation:

A checkpoint is a saved AOS-CX configuration state that can later be used for comparison, recovery, or rollback. Checkpoints are useful before making significant configuration changes because they provide a known configuration to return to if the new settings cause problems. AOS-CX can maintain manually created and system-generated checkpoints. The checkpoint feature is therefore part of configuration management and change protection rather than firmware storage or logging. Keeping a reliable recovery point can significantly reduce the operational risk associated with network changes.

Question 182. What does checkpoint rollback do?

1. Deletes all checkpoints
2. Reboots the switch
3. Saves the running configuration
4. Applies a saved checkpoint to the running configuration

Correct Answer: 4. Applies a saved checkpoint to the running configuration

Explanation:

The checkpoint rollback command restores the running configuration from a selected checkpoint or from the startup configuration. This is useful when a configuration change creates unexpected behavior and the administrator needs to return quickly to a known working state. HPE defines rollback as reverting switch configuration to a pre-existing checkpoint. Because previous running changes are replaced by the checkpoint state, the administrator should understand the impact before executing the command. Rollback is a recovery operation, not simply a way to save configuration.

Question 183. What does write memory do?

1. Saves running-config to startup-config
2. Deletes startup-config
3. Creates an sFlow collector
4. Enables the REST API

Correct Answer: 1. Saves running-config to startup-config

Explanation:

On AOS-CX, write memory is an alias for copying the running configuration to the startup configuration. This ensures that current configuration changes remain available after a reboot. If the startup configuration already exists, it is overwritten with the current running configuration. Administrators should save intended changes after verification, especially when configuring devices manually. A checkpoint and startup configuration serve different purposes: checkpoints provide recoverable configuration states, while startup-config is the configuration normally loaded during system startup.

Question 184. What can Central auto-rollback protect against?

1. RF interference
2. PoE failure
3. Loss of Central connectivity after a config push
4. DHCP exhaustion

Correct Answer: 3. Loss of Central connectivity after a config push

Explanation:

Central auto-rollback protects against configuration pushes that accidentally break the switch’s management connectivity to Central. If the switch loses its connection after a pushed configuration, the mechanism can restore the last known stable configuration and reconnect. HPE documents an approximate rollback period of about ten minutes for the supported workflow. After recovery, administrators should review the change that caused the disconnect before allowing further configuration pushes. This feature is especially valuable for remotely managed switches where an incorrect gateway, VLAN, or management-path change could otherwise require onsite recovery.

Question 185. What are system-generated checkpoints used for?

1. Automatic recovery points after configuration changes
2. Wireless client authentication
3. Firmware licensing
4. VLAN routing

Correct Answer: 1. Automatic recovery points after configuration changes

Explanation:

AOS-CX can automatically generate checkpoints after configuration changes. HPE documents post-configuration checkpoint creation as enabled by default. After configuration activity stops for the configured timeout period, the switch creates a new system checkpoint. These automatically generated checkpoints provide recent recovery points without requiring administrators to manually create a checkpoint after every small change. The switch maintains a limited number of system checkpoints and replaces older ones as the limit is reached. This improves change safety and makes rollback easier when configuration mistakes occur.

Question 186. What is the PRIMARY value of configuration rollback?

1. Faster RF scanning
2. More PoE power
3. More VLAN IDs
4. Faster recovery from a bad configuration

Correct Answer: 4. Faster recovery from a bad configuration

Explanation:

Configuration rollback provides a fast way to restore a known working switch configuration when a new change causes an outage or unexpected behavior. Instead of manually reversing each command, an administrator can apply a previously saved checkpoint. This reduces recovery time and the likelihood of introducing additional mistakes while troubleshooting. HPE’s AOS-CX configuration model and checkpoint system are designed to make this type of recovery straightforward. Rollback is especially useful before and after significant network changes involving management connectivity, routing, security, or interface configuration.

Question 187. What does the AOS-CX REST API provide?

1. Programmatic switch management
2. RF spectrum analysis
3. PoE negotiation
4. Physical stacking

Correct Answer: 2. Programmatic switch management

Explanation:

The AOS-CX REST API provides programmatic access to the switch configuration and state database. Automation scripts or management applications can retrieve information and make supported changes without parsing human-oriented CLI output. HPE emphasizes that the REST API uses structured resources, making automation less dependent on CLI formatting. This is valuable for repeatable provisioning, monitoring, integration, and configuration management across many switches. REST API programmability is separate from RF analysis, power negotiation, or physical switch stacking.

Question 188. Which protocol secures AOS-CX REST API requests?

1. TFTP
2. Telnet
3. HTTPS
4. FTP

Correct Answer: 3. HTTPS

Explanation:

The AOS-CX REST API operates as a web service using HTTPS. HTTPS provides an encrypted transport channel for API requests and responses, protecting authentication information and management data while it crosses the network. REST operations are performed against resource URIs using standard HTTP methods such as GET, POST, PUT, PATCH, and DELETE. Secure API access remains part of the management plane, so administrators should also apply proper credentials, roles, certificates, and network-access controls around the switch’s management interfaces.

Question 189. Which REST method is mainly used to retrieve data?

1. POST
2. DELETE
3. PATCH
4. GET

Correct Answer: 4. GET

Explanation:

The HTTP GET method is primarily used to retrieve information from a REST resource. In an AOS-CX automation workflow, a script can use GET requests to query configuration or operational state from supported API endpoints. Other methods serve different purposes: POST can create resources or initiate supported actions, PUT can replace or update resources, PATCH can partially modify supported resources, and DELETE removes supported resources. Understanding the basic REST methods is important for junior administrators who work with AOS-CX programmability or network automation tools.

Question 190. What identifies a REST resource?

1. A URI
2. A VLAN name
3. A MAC table
4. A VSF ID

Correct Answer: 2. A URI

Explanation:

A REST resource is identified by a Uniform Resource Identifier (URI). The URI tells the REST client which switch resource or data object it wants to read or modify. HPE documents that an AOS-CX REST URI can include elements such as the device address, REST API version, resource path, and optional query information. The REST API version itself is also included in the URI. Correct URI construction is therefore fundamental when writing scripts or testing requests against the AOS-CX REST API.

Question 191. What is the built-in REST API reference based on?

1. SNMP MIB browser
2. AirMatch
3. Swagger UI
4. LLDP

Correct Answer: 3. Swagger UI

Explanation:

AOS-CX includes a browser-based REST API Reference built on Swagger UI. It documents supported resources, URIs, parameters, data models, methods, and errors. Administrators and developers can use it while building or testing automation scripts, and it can help generate properly structured REST requests without needing to memorize every endpoint. HPE notes that the reference is mainly a development and testing aid rather than the normal day-to-day configuration interface. It is especially useful when learning AOS-CX REST programmability.

Question 192. What is the PRIMARY purpose of a syslog server?

1. Assign IP addresses
2. Store forwarded event logs
3. Build LAGs
4. Authenticate clients

Correct Answer: 2. Store forwarded event logs

Explanation:

A remote syslog server receives event messages from network devices and stores them centrally. This allows administrators to preserve logs even if a switch reboots or becomes inaccessible and makes it easier to search events across multiple devices. AOS-CX allows remote logging destinations to be configured with parameters such as severity, transport type, VRF, and port. Centralized logging is valuable for troubleshooting, security investigations, and change correlation. Syslog does not provide DHCP addressing, link aggregation, or endpoint authentication.

Question 193. What does syslog severity control?

1. Which event importance levels are forwarded
2. Switch port speed
3. WLAN channel width
4. LACP priority

Correct Answer: 4. Which event importance levels are forwarded

Explanation:

Syslog severity determines which classes of event messages are sent to a remote logging server. AOS-CX supports severity levels ranging from very serious emergency or alert conditions through informational and debug messages. By selecting an appropriate threshold, administrators can avoid overwhelming a collector with unnecessary events while still retaining important operational information. HPE Central also permits administrators to configure logging-server severity settings for managed switches. Severity filtering affects event collection and does not change interface speed, WLAN behavior, or LACP operation.

Question 194. Which secure syslog transport can AOS-CX use?

1. TFTP
2. FTP
3. TLS
4. ARP

Correct Answer: 1. TLS

Explanation:

AOS-CX supports syslog forwarding over TLS, allowing log traffic to be protected while traveling to the remote logging server. HPE documents TLS as one supported remote logging transport alongside UDP and TCP. TLS can use certificate-based validation, improving confidentiality and peer trust for sensitive log data. The documented default TLS syslog port is 6514. Secure logging is particularly useful when event messages cross untrusted or shared networks, because ordinary unencrypted syslog could expose operational details to an observer.

Question 195. What can the AOS-CX Web UI Log page show?

1. Only PoE statistics
2. Event log entries
3. Only DHCP leases
4. Only routing tables

Correct Answer: 3. Event log entries

Explanation:

The AOS-CX Web UI Log page displays switch event log entries with details such as time, severity, identifier, and message. Administrators can query or filter the displayed information to help investigate faults and operational changes. HPE documents that the Web UI presents event logs rather than all accounting logs, which may require CLI or REST access. The ability to filter by severity and other criteria helps junior administrators narrow a large event history to the messages most relevant to the current troubleshooting task.

Question 196. What is sFlow used for?

1. Traffic monitoring through sampling
2. User authentication
3. VLAN creation
4. Firmware rollback

Correct Answer: 3. Traffic monitoring through sampling

Explanation:

sFlow monitors switched and routed traffic by sampling packets and collecting interface counters. An sFlow agent running on the switch exports this information to an sFlow collector, which stores and analyzes it. This lets administrators understand traffic patterns without capturing every packet in full. HPE documents support for sFlow sampling on Ethernet and LAG interfaces on supported AOS-CX platforms. Because sFlow is based on sampling rather than full packet capture, it scales well for continuous traffic visibility across campus or data-center networks.

Question 197. What does an sFlow collector do?

1. Assign VLANs
2. Receive and analyze sFlow data
3. Authenticate administrators
4. Provide PoE

Correct Answer: 4. Receive and analyze sFlow data

Explanation:

The sFlow collector receives monitoring datagrams sent by sFlow agents on network devices. It stores and processes the sampled traffic and counter information so administrators or monitoring applications can analyze network flow patterns. The switch itself acts as the sFlow agent by sampling forwarded traffic and interface statistics. HPE documents support for multiple collectors on supported platforms. The collector is therefore an analysis destination rather than an access-control, VLAN, or power-delivery component.

Question 198. What is the default sFlow polling interval in the cited AOS-CX configuration?

1. 5 seconds
2. 10 seconds
3. 30 seconds
4. 300 seconds

Correct Answer: 1. 30 seconds

Explanation:

HPE documents a default sFlow polling interval of 30 seconds on the cited AOS-CX platforms. Polling determines how frequently interface counter information is collected for sFlow reporting. Administrators can change the interval within the supported range when different monitoring granularity is needed. Very frequent monitoring should still be planned carefully because aggressive sampling or polling can increase resource usage. The default provides a practical starting point for general network visibility while avoiding unnecessarily high control-plane overhead.

Question 199. What can an excessive sFlow sampling rate cause?

1. Automatic VLAN deletion
2. Higher CPU load and dropped samples
3. Loss of PoE budget
4. STP root changes

Correct Answer: 2. Higher CPU load and dropped samples

Explanation:

HPE warns that configuring extremely aggressive sFlow sampling can increase switch CPU utilization. If the device cannot process the requested rate of samples, some samples may also be dropped. Administrators should therefore balance visibility requirements against the processing resources available on the switch. A lower sampling interval provides more detailed traffic observation but can create greater overhead. Proper sFlow configuration should provide enough information for traffic analysis without negatively affecting the switch’s control-plane performance.

Question 200. Which design BEST supports safe switch operations?

1. No logging or backups
2. CLI changes with no recovery plan
3. Checkpoints, syslog, REST automation, and sFlow monitoring
4. Disable startup-config

Correct Answer: 3. Checkpoints, syslog, REST automation, and sFlow monitoring

Explanation:

A strong operational design combines multiple tools. Checkpoints provide recovery points before or after configuration changes. Syslog centralizes events so administrators can investigate failures and changes across devices. The AOS-CX REST API supports structured automation and programmatic management, reducing repetitive manual work when used carefully. sFlow provides sampled traffic visibility that helps identify bandwidth patterns and unusual traffic behavior. Together, these capabilities support safer configuration management, better troubleshooting, and stronger operational awareness. No single tool replaces the others because each addresses a different part of network operations.