View Full HP HPE6-A85 Exam Dumps and Practice Test Dumps.

Question 301. What does ping test?

1. VLAN membership
2. IP reachability
3. PoE power
4. Firmware status

Correct Answer: 2. IP reachability

Explanation:

The ping command is a basic network troubleshooting tool used to verify IP connectivity between two endpoints. AOS-CX sends ICMP Echo Request packets and waits for Echo Replies from the destination. Successful responses indicate that basic Layer 3 communication exists along the path. Ping can also provide round-trip timing information and packet-loss statistics. AOS-CX supports options such as source interface, VRF, packet size, timeout, and number of repetitions. Ping does not verify VLAN membership, PoE power, or firmware state.

Question 302. What does traceroute show?

1. PoE classes
2. MAC entries
3. Firmware images
4. Network path hops

Correct Answer: 4. Network path hops

Explanation:

Traceroute identifies the intermediate Layer 3 hops that packets traverse toward a destination. It progressively changes the packet’s TTL, or hop-limit behavior, so routers along the path generate responses. This helps administrators locate where connectivity begins to fail or where unexpected routing occurs. HPE recommends using traceroute when a destination cannot be reached and an intermediate device may be dropping traffic. It complements ping by showing the path rather than merely testing whether the final destination responds.

Question 303. What limits packet hop count?

1. TTL
2. DSCP
3. VLAN ID
4. TCP port

Correct Answer: 1. TTL

Explanation:

The IPv4 Time to Live field limits how many Layer 3 hops a packet can traverse. Each router decreases the TTL as the packet is forwarded. When TTL reaches zero, the router discards the packet and can generate an ICMP Time Exceeded response. Traceroute uses this behavior to discover intermediate routers along a path. The mechanism prevents packets from circulating indefinitely during routing loops. DSCP identifies QoS treatment, VLAN IDs identify Layer 2 segments, and TCP ports identify transport-layer applications.

Question 304. What can “Destination host unreachable” indicate?

1. Normal connectivity
2. Successful DNS resolution
3. A failed path or unreachable host
4. Correct PoE operation

Correct Answer: 3. A failed path or unreachable host

Explanation:

A Destination Host Unreachable message indicates that the destination cannot currently be reached through the expected IP path. HPE notes that the destination itself may be down, or an intermediate device may be dropping or unable to forward the traffic. Administrators can use traceroute to determine how far packets travel before the failure occurs. On some switches, an ingress ACL may also block ICMP traffic. The message therefore points toward a Layer 3 connectivity problem rather than successful communication.

Question 305. What does TDR test?

1. Copper cable faults
2. RADIUS roles
3. WLAN channels
4. Routing metrics

Correct Answer: 1. Copper cable faults

Explanation:

Time-Domain Reflectometer cable diagnostics help detect and locate faults in supported copper Ethernet cables. AOS-CX sends a low-voltage pulse through the cable and measures reflections caused by impedance changes. From the timing of those reflections, the switch can estimate the location of an open or other cable problem. HPE supports TDR on selected AOS-CX switch ports and platforms. It is a physical-layer troubleshooting feature rather than an authentication, WLAN, or routing function.

Question 306. What can a cable diagnostic test do temporarily?

1. Change VLANs
2. Delete routes
3. Disable AAA
4. Bring the tested link down

Correct Answer: 4. Bring the tested link down

Explanation:

HPE warns that running a cable diagnostic test can temporarily bring down the tested Ethernet link. The test activates TDR functionality on the port’s physical-layer hardware and may take several seconds to complete. Administrators should therefore consider the service impact before running the test on a production interface. The diagnostic is useful for locating cable faults without physically removing the cable, but it should still be scheduled carefully when the interface carries active user or uplink traffic.

Question 307. What does cable status open mean?

1. Perfect cable
2. Missing continuity
3. High PoE load
4. Full duplex

Correct Answer: 2. Missing continuity

Explanation:

An open cable result indicates that the electrical path is not properly terminated or continuity is missing. This can occur when a cable pair is cut, damaged, disconnected, or not connected to a link partner. TDR helps estimate where the discontinuity is located along the cable. An open condition is therefore a physical cabling problem rather than a duplex, PoE, or VLAN condition. After identifying the affected pair or approximate distance, the administrator can inspect connectors, patch panels, and cable runs.

Question 308. What does cable status good mean?

1. Cable is encrypted
2. PoE is enabled
3. MDI pair is healthy
4. VLAN is tagged

Correct Answer: 3. MDI pair is healthy

Explanation:

A good cable-diagnostic result indicates that the tested MDI wire pair is operating normally and the TDR did not identify a fault on that pair. This helps administrators rule out certain physical cabling problems when troubleshooting a copper Ethernet link. A good TDR result does not guarantee that every higher-layer configuration is correct; VLANs, speed negotiation, ACLs, addressing, or routing could still cause connectivity problems. Cable diagnostics specifically evaluate physical cable health.

Question 309. What does DOM monitor?

1. DHCP leases
2. User roles
3. VLAN trunks
4. Optical transceiver health

Correct Answer: 4. Optical transceiver health

Explanation:

Digital Optical Monitoring provides diagnostic information about supported optical transceivers such as SFP, SFP+, and QSFP modules. AOS-CX can display values including module temperature, voltage, transmit-bias current, receive power, transmit power, and alarm or warning flags. These measurements help administrators determine whether an optical link problem is caused by weak signal levels, excessive temperature, or another transceiver condition. DOM is therefore valuable for physical-layer fiber troubleshooting and is unrelated to DHCP, user authorization, or VLAN trunking.

Question 310. What does low Rx power suggest?

1. Weak received optical signal
2. High CPU use
3. DHCP failure
4. Wrong VLAN name

Correct Answer: 1. Weak received optical signal

Explanation:

Rx power represents the optical signal level received by a transceiver. If the value is below an acceptable threshold, the fiber path may have excessive loss, dirty connectors, poor splices, incorrect optics, excessive distance, or another optical-layer problem. AOS-CX DOM output displays Rx power together with manufacturer-defined warning and alarm thresholds where supported. Reviewing receive and transmit power at both ends of a fiber link can help isolate whether the problem lies with a transceiver or the optical path itself.

Question 311. Which command shows transceiver details?

1. show vlan
2. show arp
3. show interface transceiver
4. show ntp

Correct Answer: 3. show interface transceiver

Explanation:

The AOS-CX show interface transceiver command displays information about transceivers installed in the switch. Depending on the transceiver and platform, the output can include type, product information, serial number, part number, and additional details. The command also supports detailed and threshold-violation views on supported switches. HPE notes that unsupported third-party transceivers may provide only basic information and can be identified specially in the output. This command is useful when verifying optics during physical-link troubleshooting.

Question 312. What is port mirroring used for?

1. Firmware upgrade
2. Traffic analysis
3. User authentication
4. PoE control

Correct Answer: 2. Traffic analysis

Explanation:

Port mirroring copies selected network traffic from one or more source interfaces to a destination where the traffic can be captured and analyzed. This is useful when troubleshooting protocol exchanges, application behavior, packet loss, or security events that require packet-level visibility. AOS-CX supports mirroring received traffic, transmitted traffic, or both. HPE troubleshooting guidance explicitly recommends mirroring and packet capture when deeper analysis is required after basic connectivity checks. Mirroring is a monitoring feature and does not upgrade firmware or authenticate users.

Question 313. What is a mirror destination?

1. Where copied traffic is sent
2. Traffic being copied
3. A DHCP server
4. A routing neighbor

Correct Answer: 1. Where copied traffic is sent

Explanation:

A mirror destination is the interface, supported LAG, CPU destination, or other supported endpoint that receives copied traffic from the mirroring session. An analyzer or packet-capture device can be attached to the destination interface to inspect the replicated packets. AOS-CX configures this with the destination interface command for local port-mirroring scenarios. The source identifies which traffic should be copied; the destination identifies where that copy is delivered.

Question 314. What does mirror direction both copy?

1. Inbound only
2. Outbound only
3. Control traffic only
4. Inbound and outbound traffic

Correct Answer: 4. Inbound and outbound traffic

Explanation:

When an AOS-CX mirror source is configured with the direction both, the session copies both received and transmitted packets associated with that source interface. The rx option copies received traffic only, while tx copies transmitted traffic only. Selecting the correct direction helps reduce unnecessary capture volume and ensures the administrator observes the portion of the conversation relevant to the problem. HPE troubleshooting examples use both when packet capture needs visibility in both directions.

Question 315. What does show mirror display?

1. MAC aging
2. Mirroring-session status
3. DNS cache
4. Firmware images

Correct Answer: 2. Mirroring-session status

Explanation:

The show mirror command displays information about configured mirroring sessions. Without a session ID, it provides a summary; with an ID, it provides detailed information about that session. HPE output includes administrative status, operational status, source information, and destination information. Operational states can also reveal problems such as a missing destination, a shutdown destination interface, or internal errors. This makes show mirror useful for verifying that packet-capture configuration is actually active before analyzing the capture destination.

Question 316. What is show tech mainly used for?

1. VLAN creation
2. PoE negotiation
3. Diagnostic data collection
4. RADIUS authentication

Correct Answer: 3. Diagnostic data collection

Explanation:

show tech gathers detailed technical information useful for troubleshooting and support analysis. HPE recommends generating show-tech information when working through complex faults or opening a TAC case. AOS-CX also supports copying show-tech output for individual features to local storage, USB, or remote locations using protocols such as SFTP or SCP. The collected information helps support engineers understand system state without requiring the administrator to manually gather many individual show commands.

Question 317. What is ServiceOS mainly for?

1. Daily user switching
2. WLAN roaming
3. DHCP relay
4. Recovery and support tasks

Correct Answer: 4. Recovery and support tasks

Explanation:

ServiceOS is a standalone boot and recovery environment available on AOS-CX switches. HPE describes it as a recovery operating system used in uncommon troubleshooting situations, including support tasks and certain system-recovery functions. It is not the normal operating environment for day-to-day switching and routing. From the boot process, administrators can select the primary image, secondary image, or ServiceOS console. Because ServiceOS is intended for recovery and low-level support work, normal production management remains in AOS-CX.

Question 318. What does boot system secondary select?

1. Primary image
2. Secondary image
3. ServiceOS only
4. Startup-config

Correct Answer: 2. Secondary image

Explanation:

The boot system secondary command reboots the switch using the secondary AOS-CX software image. HPE also states that selecting secondary sets the secondary image as the configured default operating-system image for future reboots. AOS-CX maintains primary and secondary image locations to provide software-management flexibility and recovery options. The serviceos option is separate and boots the recovery environment without changing the normal default AOS-CX image.

Question 319. Which command checks installed images?

1. show images
2. show clients
3. show vlan
4. show radius

Correct Answer: 1. show images

Explanation:

HPE documentation for the boot system workflow identifies show images as the command used to display information about the primary and secondary operating-system images. Administrators should verify installed images before selecting a different boot image during maintenance or troubleshooting. Maintaining valid primary and secondary images can provide an additional recovery option if a software problem affects one image. The command is unrelated to client sessions, VLAN configuration, or RADIUS authentication.

Question 320. Which sequence BEST troubleshoots connectivity?

1. Reboot first
2. Upgrade firmware first
3. Check cabling, ping/traceroute, then capture traffic if needed
4. Factory-reset immediately

Correct Answer: 3. Check cabling, ping/traceroute, then capture traffic if needed

Explanation:

A structured troubleshooting process begins with simple, low-risk checks before moving to disruptive actions. HPE recommends checking the physical cabling and topology, verifying basic unicast connectivity with ping and traceroute, and fixing problems discovered at those stages. If the issue remains unclear, traffic mirroring and packet capture can provide deeper protocol visibility. Show-tech information can also be gathered for detailed analysis or TAC escalation. Rebooting, upgrading firmware, or factory-resetting immediately can disrupt service without identifying the underlying fault and should not be the default first action.