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?
Correct Answer: B
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.
Question 17
Exhibit. After Implementing a distributed overlay with distributed anycast gateways, you noticed that toomany ARP packets are being replicated to every access (leaf) switch Which command can you use to optimize the network?
Correct Answer: B
In an EVPN VXLAN distributed overlay network, excessive ARP packet replication (flooding) to all leaf switches is observed. We need the command to optimize this. * EVPN ARP Optimization:EVPN uses its control plane (BGP) to distribute MAC and IP address reachability information. Leaf switches (VTEPs) learn these mappings. To reduce ARP flooding across the VXLAN fabric: * ARP Suppression:VTEPs intercept ARP requests. If the VTEP already knows the MAC address for the requested IP (learned via EVPN), it can suppress the ARP request, preventing it from being flooded over VXLAN. * Proxy ARP:VTEPs intercept ARP requests. If the VTEP knows the MAC for the requested IP, it can generate an ARP replyon behalfof the remote host. * AOS-CX Commands:These features are configured within the EVPN context. * evpn arp-suppression (B): Enables the ARP suppression feature for EVPN. * evpn ip proxy-arp (C): Enables the proxy ARP feature for EVPN. * Options A and D use standard interface/VLAN level arp-suppression or proxy-arp commands, which are not specific to optimizing flooding within the EVPN VXLAN fabric itself. * Conclusion:To optimize by reducing the replication/flooding of ARP packets across the EVPN VXLAN overlay, enabling evpn arp-suppression (Option B) is the direct command. This leverages the EVPN control plane knowledge to stop unnecessary ARP flooding. References:AOS-CX EVPN Configuration Guide (ARP Suppression, Proxy ARP features). This relates to "Switching" (19%) and "Routing" (16%) objectives in the context of overlays.
Question 18
Refer to thefour numbered steps in theexhibit. Which action is the first step in applying a role-to-role ACL on thetraffic from mobile device M1 to role H2?
Correct Answer: B
The question asks for the first step in applying a role-to-role ACL (Access Control List) on traffic from a mobile device (M1) to a role (H2) in a network using Dynamic Segmentation with VXLAN and role-based policies. * Analysis of Options: * Option A:Describes an intermediate step where the edge switch transfers the Group Policy ID over VXLAN, which occurs later in the process. * Option B:Correct. The first step is the AP forwarding the packet from the mobile device (M1) to the gateway, which initiates the traffic flow in a tunneled Dynamic Segmentation setup. * Option C:Describes a later step where the destination switch (A1) enforces the role-to-role ACL, after the packet has traversed the network. * Option D:Describes a step where the gateway forwards traffic over a VXLAN tunnel, which occurs after the AP forwards the packet. * Why Option B is Correct:In HPE Aruba Networking's Dynamic Segmentation architecture, wireless clients (e.g., M1) connect to an AP, which tunnels traffic to a gateway (e.g., in tunneled mode). The first step in the traffic flow is the AP forwarding the client's packet to the gateway, which then processes the packet for role assignment and policy enforcement. This aligns with the role-to-role ACL application process, where the gateway applies policies based on the source (M1's role) and destination (H2's role) using Group Policy IDs over VXLAN. * Relevance to Certification Objectives: * Security (10%):Involves designing and troubleshooting role-based security policies in customer networks. * WLAN (9%):Includes implementing and troubleshooting wireless traffic flows in Dynamic Segmentation. * Switching (19%):Covers Layer 2/3 interconnection technologies like VXLAN for policy enforcement. References: HPE Aruba Networking AOS-10 Configuration Guide: Dynamic Segmentation and VXLAN, detailing traffic flow. HPE7-A06Study Guide: Covers role-based ACLs and Dynamic Segmentation workflows. HPE Aruba Networking Technical Documentation: Tunneled Node and Role-Based Policy Enforcement.
Question 19
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.)
Correct Answer: C,E
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.
Question 20
Aplying the command "ip Igmp snooping blocked VLAN 6. 6* on a port ...
Correct Answer: B
The question asks for the effect of applying the command ip igmp snooping blocked vlan 5,6 on a switch port. * ip igmp snooping blocked vlan <vlan-list>:This interface configuration command instructs the IGMP snooping process on the switch to block (ignore/drop) any inbound IGMP control packets (specifically Membership Reports, i.e., "joins", and Leave messages) received on this port for the specified VLANs (5 and 6 in this case). * Effect:By blocking IGMP join messages from hosts connected to this port, the switch will not learn about any multicast group memberships requested by those hosts in VLANs 5 and 6. Consequently, the switch will not forward multicast traffic for those groups out of this port for those VLANs (unless the port is designated as a multicast router port). It effectively prevents hosts on this port from receiving multicast streams in the specified VLANs via standard IGMP mechanisms. * Analysis of Options: * A: Itresultsin traffic effectively being pruned because memberships aren't learned, but the command itself blocks the IGMPcontrolpackets (joins). * B: Correct. It stops the switch from accepting IGMP join messages on this port for VLANs 5 and 6. * C: Incorrect. It doesn't control inter-VLAN traffic. * D: Incorrect. It doesn't disable the entire port. * Conclusion:The command specifically blocks the reception and processing of IGMP join messages on the configured port for the listed VLANs. References:AOS-CX Multicast Guide (IGMP Snooping configuration commands). This relates to the "Switching" (19%) objective.
