HPE7-A08 Dumps with Practice Exam Questions Answers

To prevent rogue DHCP servers in a VLAN, DHCP snooping authorized-server commands are used to specify trusted DHCP servers allowed to respond.

Option A (dhcpv4-snooping trust 10.100.100.10) configures a trusted port, but it is not VLAN specific and not precise enough for this purpose.

Enabling DHCP snooping globally and on VLAN or interface (Options C and D) are prerequisites but do not prevent rogue servers unless authorized servers are defined.

Option B correctly enables an authorized DHCP server IP on VLAN 30, blocking unauthorized DHCP responses.

Aruba Central utilizes a " Top-Down " management model for UI Groups. To maintain the integrity of the network and ensure that the central dashboard remains the " Source of Truth, " specific logic is applied during the onboarding process.

Configuration Conflict Prevention: If a group in Central already has a configuration defined (VLANs, DNS, NTP, etc.), and you add a switch that has its own local startup-configuration, Central detects a conflict. It does not know whether to trust the local switch settings or the group settings.

The Factory Default Rule: To protect the network from unintended configuration overwrites, Central will only automatically sync and push group settings to a switch that is in a Factory Default state. If the switch has an existing configuration, Central marks it as having a " Config Conflict " and stops the synchronization process until an administrator manually intervenes to choose which configuration should " win. "

Evaluating other options:

Option B: If Central weren ' t enabled, the switch wouldn ' t even show up as " connected " or " online " in the dashboard, let alone fail a sync within a group.

Option C: Central supports VSX monitoring and management (particularly through Template groups or specific UI workflows).

Option D: Authorization happens at the " Device Inventory " level. If you have already added it to a group, the device is already authorized.

On AOS-CX, Dynamic ARP Inspection distinguishes between trusted and untrusted interfaces . All interfaces are untrusted by default, and ARP packets arriving on untrusted ports are checked against valid IP-to-MAC bindings, principally the DHCP snooping binding database or supported static bindings. HPE Aruba specifies that only ARP traffic entering untrusted interfaces is subjected to these validation checks. Aruba Networks

A hypervisor port is a special case because the physical interface can legitimately source ARP traffic for many virtual machines , each with its own MAC address and IP address. Unless every VM has a corresponding valid binding available to Dynamic ARP Inspection, legitimate VM ARP traffic can be interpreted as invalid. Configuring interface 1/1/20 as trusted prevents these legitimate ARP messages from generating false-positive inspection failures.

On the CX 6300, the correct interface-level configuration is:

interface 1/1/20

arp inspection trust

HPE Aruba explicitly documents arp inspection trust under the physical interface configuration context and confirms that it marks the interface as trusted. Aruba Networks

Options B, C, and D are not valid forms of the AOS-CX DAI trust command. Trust is assigned to the interface , not directly to an individual MAC/IP pair using those syntaxes.

Study Guide References: Dynamic ARP Inspection; DHCP Snooping Bindings; Trusted and Untrusted Interfaces; Hypervisor Connectivity; ARP Spoofing Protection.

When a recent routing change causes an outage affecting all users, the recommended immediate action is to restore the last-known working configuration to quickly return the network to a stable state. This is critical to minimize downtime and impact.

Asking customers to send logs or explaining the issue takes time and delays remediation.

Collecting show tech and opening TAC cases can be done after restoring service.

Hence, the quickest way to mitigate the impact is to restore the last known good configuration.

In the study of BGP (Border Gateway Protocol) for AOS-CX, understanding the differences between Internal BGP (iBGP) and External BGP (eBGP) is fundamental to the ACP-S certification.

eBGP Peering Definition: eBGP occurs when two BGP neighbors reside in different Autonomous Systems. In this scenario, the local switch is in AS 65010 and the neighbor is in AS 65100.

The " Directly Connected " Requirement: By default, BGP assumes that eBGP neighbors are directly connected (physically connected or on the same subnet). This is because eBGP packets are sent with a Time-to-Live (TTL) of 1. If the neighbor is more than one hop away (for example, peering via loopback interfaces without additional configuration), the packet will expire before reaching the neighbor, and the session will not establish.

Terminology Note: The term " directory connected " in the question is a common typographical error in exam materials for " directly connected. " In the context of eBGP peering, being directly connected is the default requirement to ensure the TTL 1 packet reaches the peer. If you were peering with a non-directly connected device, you would need to manually configure ebgp-multihop.

Analysis of Other Options:

Option A: This is incorrect as it uses a random AS number (65001) that does not match the local or neighbor AS provided in the prompt.

Option B: Route Reflectors are a solution used exclusively in iBGP to solve the split-horizon rule (which dictates that a prefix learned from an iBGP peer cannot be advertised to another iBGP peer). Route reflectors are never used for standard eBGP sessions.

Option D: While AOS-CX requires you to enter the address-family ipv4 unicast context to activate a neighbor, the keyword " internal " is not a valid address-family type in the AOS-CX BGP syntax for this purpose.

Key Practice Tip: When configuring BGP on AOS-CX, always remember that after defining the neighbor x.x.x.x remote-as, you must enter the address-family context and use the neighbor x.x.x.x activate command for the session to transition to the " Established " state.