A company has AOS-CX switches deployed in a two-tier topology that uses OSPF routing at the core. You need to prevent ARP poisoning attacks. To meet this need, what is one technology that you could apply to user VLANs on access layer switches? (Select two.)
Correct Answer: A,D
The scenario involves AOS-CX switches in a two-tier topology (access and core layers) using OSPF routing at the core. The goal is to prevent ARP poisoning attacks on user VLANs at the access layer switches, where end-user devices connect. ARP poisoning (also known as ARP spoofing) is an attack where a malicious device sends fake ARP messages to associate its MAC address with the IP address of another device (e.g., the default gateway), allowing the attacker to intercept traffic. ARP Inspection (Dynamic ARP Inspection, DAI): This feature prevents ARP poisoning by validating ARP packets against a trusted database of IP-to-MAC bindings. On AOS-CX switches, ARP inspection uses the DHCP snooping binding table to verify that ARP messages come from legitimate devices. If an ARP packet does not match the binding table, it is dropped. DHCPv4 Snooping: This feature protects against rogue DHCP servers and builds a binding table of legitimate IP-to-MAC mappings by snooping DHCP traffic. The binding table is used by ARP inspection to validate ARP packets. DHCP snooping must be enabled before ARP inspection can function effectively, as it provides the trusted data for validation. Option A, "ARP inspection," is correct. ARP inspection (DAI) directly prevents ARP poisoning by ensuring that ARP packets are legitimate, making it a key technology for this purpose. Option B, "OSPF passive interface," is incorrect. OSPF passive interface is used to prevent OSPF from sending routing updates on specific interfaces, typically to reduce routing protocol traffic on user-facing interfaces. It does not prevent ARP poisoning, which is a Layer 2 attack. Option C, "BPDU guard (protection)," is incorrect. BPDU guard protects against spanning tree protocol (STP) attacks by disabling a port if it receives BPDUs (e.g., from an unauthorized switch). It does not address ARP poisoning, which is unrelated to STP. Option D, "DHCPv4 snooping," is correct. DHCP snooping is a prerequisite for ARP inspection, as it builds the binding table used to validate ARP packets. It also protects against rogue DHCP servers, which can indirectly contribute to ARP poisoning by assigning incorrect IP addresses. Option E, "BPDU filtering," is incorrect. BPDU filtering prevents a port from sending or receiving BPDUs, which can be used to protect against STP attacks, but it does not prevent ARP poisoning. The HPE Aruba Networking AOS-CX 10.12 Security Guide states: "To prevent ARP poisoning attacks on user VLANs, enable Dynamic ARP Inspection (DAI) on access layer switches. DAI validates ARP packets against the DHCP snooping binding table to ensure they come from legitimate devices. Use the command ip arp inspection vlan <vlan-list> to enable DAI on the specified VLANs. DHCP snooping must be enabled first with dhcp-snooping and dhcp-snooping vlan <vlan-list> to build the binding table used by DAI." (Page 145, ARP Inspection and DHCP Snooping Section) Additionally, the guide notes: "DHCP snooping and ARP inspection work together to protect against Layer 2 attacks like ARP poisoning. DHCP snooping builds a trusted database of IP-to-MAC bindings, which ARP inspection uses to filter out malicious ARP packets." (Page 146, Best Practices Section) : HPE Aruba Networking AOS-CX 10.12 Security Guide, ARP Inspection and DHCP Snooping Section, Page 145. HPE Aruba Networking AOS-CX 10.12 Security Guide, Best Practices Section, Page 146.
Question 97
What distinguishes a Distributed Denial of Service (DDoS) attack from a traditional Denial or service attack (DoS)?
Correct Answer: C
Question 98
Which is a correct description of a stage in the Lockheed Martin kill chain?
Correct Answer: D
The Lockheed Martin Cyber Kill Chain model describes the stages of a cyber attack. In the exploitation phase, the attacker uses vulnerabilities to gain access to the system. Following this, in the installation phase, the attacker installs a backdoor or other malicious software to ensure persistent access to the compromised system. This backdoor can then be used to control the system, steal data, or execute additional attacks. : Lockheed Martin Cyber Kill Chain framework.
Question 99
Refer to the exhibit, which shows the current network topology. You are deploying a new wireless solution with an Aruba Mobility Master (MM). Aruba Mobility Controllers (MCs). and campus APs (CAPs). The solution will Include a WLAN that uses Tunnel for the forwarding mode and Implements WPA3-Enterprise security What is a guideline for setting up the vlan for wireless devices connected to the WLAN?
Correct Answer: A
Question 100
What is a benefit of Protected Management Frames (PMF). sometimes called Management Frame Protection (MFP)?
Correct Answer: D
Protected Management Frames (PMF), also known as Management Frame Protection (MFP), is designed to protect clients from denial-of-service (DoS) attacks that involve forged de-authentication and disassociation frames. These attacks can disconnect legitimate clients from the network. PMF provides a way to authenticate these management frames, ensuring that they are not forged, thus enhancing the security of the wireless network. References: IEEE 802.11w amendment, which introduces PMF as a security enhancement to protect management frames. Wi-Fi Alliance security guidelines for Protected Management Frames (PMF).
