Free HP HPE6-A45 Exam Practice Questions & Explanations
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A security review of a campus network reveals that a rogue DHCP server on an access VLAN handed out incorrect gateway addresses, redirecting client traffic through an attacker-controlled device. The architect's remediation requirement is to prevent unauthorized DHCP servers from responding to client requests on access ports, while still allowing legitimate DHCP responses from trusted uplink ports. Which feature should be implemented on the access layer switches?
DHCP snooping builds a binding table from trusted ports (typically uplinks toward the legitimate DHCP server) and blocks DHCP server responses (offers/acks) received on untrusted access ports, directly preventing rogue DHCP servers from responding to clients. Dynamic ARP inspection (B) relies on the DHCP snooping binding table but addresses ARP spoofing, not rogue DHCP servers directly. IGMP snooping (C) is for multicast traffic optimization and unrelated to DHCP security. Storm control (D) mitigates broadcast/multicast/unicast storms, not targeted rogue DHCP responses.
An implementation plan calls for a resilient Layer 2 access-to-distribution design using two Aruba CX distribution switches configured as a VSX pair. Access switches are dual-homed to both distribution switches. The plan requires that access switches see the two uplinks as a single logical LACP port-channel, while the distribution switches operate independently for control-plane functions. Which technology should be configured on the distribution switch uplinks to meet this requirement?
VSX LAG (multi-chassis LAG) allows two physically separate VSX peer switches to present a single logical LACP port-channel to a downstream device, such as an access switch, while each VSX member continues to operate its own independent control plane. Static aggregation (B) lacks the negotiation and failure detection benefits of LACP. MSTP (C) is a loop-prevention protocol, not a link-aggregation technology, and would not achieve the single logical port-channel requirement. VRRP (D) provides gateway redundancy at Layer 3, not link aggregation at Layer 2.
A network architect's design document specifies that all access layer switches must use dynamic VLAN assignment based on ClearPass policy results delivered via RADIUS, and that the assigned VLAN must be applied only after successful 802.1X authentication completes. During validation testing, the engineer notices that the VLAN is applied immediately when the port link comes up, before authentication finishes.
This behavior indicates a misconfiguration that violates the architect's design intent, because the VLAN should only be applied after the RADIUS Access-Accept message is received with the VLAN attributes.
The statement is true. In an 802.1X dynamic VLAN design, the port should remain in a restricted or unauthorized state (often using an unauthenticated VLAN or blocking traffic) until the RADIUS server returns an Access-Accept containing VLAN attributes (such as Tunnel-Private-Group-ID). If the VLAN is applied immediately at link-up rather than after authentication, this indicates the port is not properly configured for 802.1X-controlled VLAN assignment, which is a misconfiguration relative to the design intent.
During a security audit of an Aruba CX access layer, the security team discovers that an unauthorized device was able to connect to an access port and immediately obtain full network access without any authentication challenge. The organization requires that only authenticated and authorized endpoints receive network access, while still allowing devices that cannot perform 802.1X to be evaluated by MAC address. Which remediation action should be implemented on the access ports?
Enabling 802.1X with MAC Authentication Bypass (MAB) as a fallback ensures that 802.1X-capable devices authenticate via certificates or credentials, while non-802.1X devices (such as printers) are still evaluated using their MAC address before being granted access. Port security (A) only limits MAC count, not authentication. ACLs (B) restrict traffic types but do not authenticate the endpoint. Disabling unused ports (D) is a good general practice but does not address active ports requiring authentication. Native VLAN changes (E) are unrelated to endpoint authentication.
An architect is designing a campus network using Aruba CX switches with VSX at the core. The design requires that if the ISL (inter-switch link) fails but both VSX members remain up and connected to the network, the network should continue to forward traffic without a split-brain condition. Which mechanism should be included in the design to meet this requirement?
The VSX keepalive link provides an out-of-band path used to detect whether the peer switch is truly down or if only the ISL has failed. Without it, both switches could believe they are primary, leading to a split-brain scenario. LACP fallback (A) relates to bringing up LACP before a peer negotiates, loop guard (C) protects against unidirectional link failures in STP, and static MAC entries (D) do not address split-brain detection.