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HPE Campus Access Switching Expert Written Exam Sample Questions (Q45-Q50):

NEW QUESTION # 45
AnOSPF router has teamed a path to an external network oy both an El and an E2 advertisement, both routes having the same path cost. Which path -will the router prefer?

A. Both routes will be suppressed until the path conflict has been resolved.
B. The router will prefer the E1 path.
C. The router will prefer the E2 path.
D. The router will use both paths equally by means ofECMP

Answer: B

Explanation:
The question involves an OSPF router receiving both an E1 (External Type 1) and an E2 (External Type 2) advertisement for an external network with the same path cost. The task is to determine which path the router will prefer.
* Analysis of Options:
* Option A (ECMP):Equal-Cost Multi-Path (ECMP) is used when multiple paths have the same total cost, but E1 and E2 routes have different metric calculations, so ECMP does not apply here.
* Option B (Prefer E2):Incorrect, as E2 routes are preferred only when E1 routes are not present or have a higher total cost.
* Option C (Suppressed):OSPF does not suppress routes due to path conflicts; it selects the best path based on metrics.
* Option D (Prefer E1):Correct. OSPF prefers E1 routes over E2 routes because E1 routes include the internal cost to the ASBR (Autonomous System Boundary Router) plus the external cost, providing a more accurate total cost.
* Why Option D is Correct:In OSPF, external routes are advertised as E1 or E2. E1 routes include both the external cost (advertised by the ASBR) and the internal cost to reach the ASBR, making them more precise for path selection. E2 routes only consider the external cost and are the default for redistributed routes unless explicitly configured as E1. When an OSPF router receives both E1 and E2 routes with the same external cost, it prefers the E1 route because it accounts for the total path cost, including internal network topology. This is per OSPF standards (RFC 2328).
* Relevance to Certification Objectives:
* Routing (16%):Involves designing and troubleshooting OSPF routing topologies, including external route types (E1 vs. E2).
* Troubleshooting (10%):Includes analyzing OSPF path selection to resolve routing issues.
References:
HPE Aruba Networking AOS-CX Configuration Guide: OSPF Configuration, detailing E1 and E2 route types.
HPE7-A06Study Guide: Covers OSPF external route selection and path preference.
RFC 2328: OSPF Version 2, explaining E1 and E2 route metrics and preference.

NEW QUESTION # 46
Exhibit.

Answer: A

Explanation:
The question involves configuring an OSPF virtual link to extend area 0 across a non-backbone area, based on an exhibit (not provided) and four configuration options (A to D). Since the exhibit is unavailable, I will assume a typical scenario where a virtual link is needed to connect two area 0 segments through a transit area (e.g., area 1).
* Analysis of Options (Assumed Context):A virtual link is configured using the area <transit-area> virtual-link <router-id> command in the OSPF process. The correct option likely includes:
* Option A:Incorrect syntax or incorrect router ID/area for the virtual link.
* Option B:Incorrect configuration, possibly missing the virtual link or using wrong parameters.
* Option C:Correct. Likely includes the proper command, e.g., area 1 virtual-link 2.2.2.2, where area 1 is the transit area and 2.2.2.2 is the router ID of the remote ABR.
* Option D:Incorrect, possibly configuring an unnecessary or incorrect virtual link.
* Why Option C is Correct:OSPF requires all areas to connect to the backbone area (area 0). If two area
0 segments are separated by a non-backbone area (e.g., area 1), a virtual link is configured between the Area Border Routers (ABRs) to logically extend area 0 through the transit area. The command area
<transit-area> virtual-link <remote-router-id> is used, specifying the transit area and the router ID of the remote ABR. Option C is assumed to provide the correct syntax and parameters based on standard OSPF virtual link configurations, ensuring area 0 connectivity and proper route advertisement.
* Relevance to Certification Objectives:
* Routing (16%):Designing and troubleshooting OSPF topologies, including virtual links.
* Troubleshooting (10%):Resolving OSPF area connectivity issues.
References:
HPE Aruba Networking AOS-CX Configuration Guide: OSPF Configuration, detailing virtual link setup.
HPE7-A06Study Guide: Covers OSPF advanced configurations like virtual links.
RFC 2328: OSPF Version 2, explaining virtual link functionality.

NEW QUESTION # 47
The customer is experiencing periodic uplink congestion between campus-1's AGG-1 and core. This has boon negativelyaffecting voice communications.The VOIP phones edge mark their packets with DSCP EF. The uplink from AGG-1 to core is LAG1.
The customer has already configured the following class and policy on AGG-1:

Based on this policy, which scrip), when deployed on AGG-1. will improve the reliable forwarding of voice trafficbetween AGG-1 and its uplink to the core?

Answer: D

Explanation:
The problem describes uplink congestion affecting VoIP traffic (marked with DSCP EF, value 46) on AGG-
1's LAG1 uplink. The existing configuration classifies this traffic into voip_class and applies voip_policy inbound, setting local-priority 6. To improve reliable forwarding during congestion, VoIP traffic needs strict priority queuing on the egress interface (LAG1).
* Analysis of Options:
* Option A applies a QoS schedule profile globally but doesn't modify the policy's local-priority or apply the schedule profile specifically to the congested LAG.
* Option B modifies voip_policy to set local-priority 7 (mapping DSCP 46 traffic to queue 7) and applies the 8qDwrStrict schedule profile to the egress interface lag 1. In the 8qDwrStrict profile, queue 7 is configured for strict priority, ensuring voice traffic gets precedence over lower-priority traffic during congestion. This aligns with best practices for QoS for VoIP.
* Option C also sets local-priority 7 and applies the schedule profile to lag 1, but the profile itself configures queue 7 with DWRR (Deficit Weighted Round Robin) instead of strict priority, which is less suitable for delay-sensitive voice traffic.
* Option D applies a schedule profile globally and uses DWRR for queue 7.
* Conclusion:Option B is the correct solution because it maps the DSCP EF traffic to the highest local priority (7) and applies a QoS schedule profile to the specific congested uplink (lag 1) that treats queue
7 with strict priority. This ensures voice traffic is prioritized reliably.
References:AOS-CX QoS Guide (specifically sections on Classification, Queuing, Scheduling Profiles, Strict Priority vs. DWRR, applying policies to interfaces/LAGs), DSCP to Queue mapping concepts. This relates to the "Performance Optimization" (6%) and "Connectivity" (9%) objectives.

NEW QUESTION # 48
Ever since a recent firewall change at your WAN/lnternet edge, the 8GP state in your VSX pair has not returned to Established. What should you check to restore BGP functionality at the site?

A. Restart NAT service for the BGP interface.
B. Confirm that BGP Peer AS has not changed.
C. Restart the routing service so thatBGP auto-discovers its neighbors.
D. Confirm that appropriate TCP ports are still allowed.

Answer: D

Explanation:
The BGP state on a VSX pair is stuck (not 'Established') after a recent firewall change at the WAN/Internet edge, where the BGP peering likely occurs.
* BGP and Firewalls:BGP establishes sessions usingTCP port 179. Firewalls located between BGP peers must explicitly permit TCP port 179 traffic bidirectionally for the peering to establish and maintain. Firewall changes are a frequent cause of broken BGP sessions.
* Troubleshooting Steps After Firewall Change:The most logical first step is to verify that the firewall change did not inadvertently block TCP port 179 between the configured BGP neighbor IP addresses.
* Analysis of Options:
* A: Restarting routing service is disruptive and not the first step.
* B: Confirming that appropriate TCP ports (specifically 179) are still allowed through the firewall directly addresses the most probable cause related to the firewall change event.
* C: Restarting NAT service is likely irrelevant unless NAT is incorrectly configured for BGP peers.
* D: Confirming the peer AS is a basic configuration check but less likely related to thefirewall changeevent than port blocking.
* Conclusion:Given the problem occurred immediately following a firewall change, verifying that the firewall still permits TCP port 179 between the BGP peers is the most direct and likely troubleshooting step.
References:BGP protocol specifications (RFC 4271), Firewall management principles, Network troubleshooting methodology. This relates to "Routing" (16%), "Security" (10%), and "Troubleshooting" (10%) objectives.

NEW QUESTION # 49
You see the output unknown the first time you in the command, but the next time you see the following information displayed.

What aresome things you could took at in the switch to troubleshootthe issue? (Select two.)

A. diag cable-diagnostic 1/1/X
B. diag cable 1/1/X
C. diag 1/1/X transceiver all
D. diag interface 1/VX transceiver all
E. diag interface transceiver al

Answer: A,C

Explanation:
The question involves troubleshooting an issue where the command output is initially unknown, but subsequent executions show diagnostic information for an interface (1/1/X). The task is to identify appropriate diagnostic commands to troubleshoot the issue.
* Analysis of Options:
* Option A (diag interface transceiver al):Incorrect syntax; "al" is not a valid parameter.
* Option B (diag interface 1/VX transceiver all):Incorrect syntax; "1/VX" is not a valid interface format.
* Option C (diag cable-diagnostic 1/1/X):Correct. This command runs a cable diagnostic test (TDR) on interface 1/1/X to check for cable faults, such as opens or shorts.
* Option D (diag cable 1/1/X):Incorrect; "diag cable" is not a valid AOS-CX command.
* Option E (diag 1/1/X transceiver all):Correct. This command displays detailed transceiver information, including status, errors, and signal quality, useful for diagnosing interface issues.
* Why C and E are Correct:The diag cable-diagnostic 1/1/X command is used to perform TDR tests to identify cable faults, which could cause connectivity issues. The diag 1/1/X transceiver all command provides detailed transceiver diagnostics, such as power levels, errors, or hardware issues, helping pinpoint problems with the interface or connected device. These commands align with AOS-CX troubleshooting workflows for physical layer issues.
* Relevance to Certification Objectives:
* Troubleshooting (10%):Involves using diagnostic commands to troubleshoot campus network issues.
* Connectivity (9%):Includes identifying problem areas in device deployment, such as cabling or transceiver issues.
References:
HPE Aruba Networking AOS-CX Configuration Guide: Diagnostic Commands, covering cable diagnostics and transceiver diagnostics.
HPE7-A06Study Guide: Details troubleshooting tools for AOS-CX switches.
HPE Aruba Networking Technical Documentation: AOS-CX Troubleshooting, explaining diagnostic command usage.

NEW QUESTION # 50
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