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HP Aruba Certified Network Security Associate Exam Sample Questions (Q113-Q118):
NEW QUESTION # 113
This company has AOS-CX switches. The exhibit shows one access layer switch, Switch-2, as an example, but the campus actually has more switches. Switch-1 is a core switch that acts as the default router for end-user devices.
What is a correct way to configure the switches to protect against exploits from untrusted end-user devices?
- A. On Switch-2, enable DHCP snooping globally and on VLANs 15 and 25. Later, enable ARP inspection on the same VLANs.
- B. On Switch-2, enable BPDU filtering on all edge ports in order to prevent eavesdropping attacks by untrusted devices.
- C. On Switch-1, enable DHCP snooping on VLAN 100 and ARP inspection on VLANs 15 and 25.
- D. On Switch-1, enable ARP inspection on VLAN 100 and DHCP snooping on VLANs 15 and 25.
Answer: A
Explanation:
The scenario involves AOS-CX switches in a two-tier topology with Switch-1 as the core switch (default router) on VLAN 100 and Switch-2 as an access layer switch with VLANs 15 and 25, where end-user devices connect. The goal is to protect against exploits from untrusted end-user devices, such as DHCP spoofing or ARP poisoning attacks, which are common threats in access layer networks.
DHCP Snooping: This feature protects against rogue DHCP servers by filtering DHCP messages. It should be enabled on the access layer switch (Switch-2) where end-user devices connect, specifically on the VLANs where these devices reside (VLANs 15 and 25). DHCP snooping builds a binding table of legitimate IP-to-MAC mappings, which can be used by other features like ARP inspection.
ARP Inspection: This feature prevents ARP poisoning attacks by validating ARP packets against the DHCP snooping binding table. It should also be enabled on the access layer switch (Switch-2) on VLANs 15 and 25, where untrusted devices are connected.
Option B, "On Switch-2, enable DHCP snooping globally and on VLANs 15 and 25. Later, enable ARP inspection on the same VLANs," is correct. DHCP snooping must be enabled first to build the binding table, and then ARP inspection can use this table to validate ARP packets. This configuration should be applied on Switch-2, the access layer switch, because that's where untrusted end-user devices connect.
Option A, "On Switch-1, enable ARP inspection on VLAN 100 and DHCP snooping on VLANs 15 and 25," is incorrect. Switch-1 is the core switch and does not directly connect to end-user devices on VLANs 15 and 25. DHCP snooping and ARP inspection should be enabled on the access layer switch (Switch-2) where the devices reside. Additionally, enabling ARP inspection on VLAN 100 (where the DHCP server is) is unnecessary since the DHCP server is a trusted device.
Option C, "On Switch-2, enable BPDU filtering on all edge ports in order to prevent eavesdropping attacks by untrusted devices," is incorrect. BPDU filtering is used to prevent spanning tree protocol (STP) attacks by blocking BPDUs on edge ports, but it does not protect against eavesdropping or other exploits like DHCP spoofing or ARP poisoning, which are more relevant in this context.
Option D, "On Switch-1, enable DHCP snooping on VLAN 100 and ARP inspection on VLANs 15 and 25," is incorrect for the same reason as Option A. Switch-1 is not the appropriate place to enable these features since it's not directly connected to the untrusted devices on VLANs 15 and 25.
The HPE Aruba Networking AOS-CX 10.12 Security Guide states:
"DHCP snooping should be enabled on access layer switches where untrusted end-user devices connect. It must be enabled globally and on the specific VLANs where the devices reside (e.g., dhcp-snooping vlan 15,25). This feature builds a binding table of IP-to-MAC mappings, which can be used by Dynamic ARP Inspection (DAI) to prevent ARP poisoning attacks. DAI should also be enabled on the same VLANs (e.g., ip arp inspection vlan 15,25) after DHCP snooping is configured, ensuring that ARP packets are validated against the DHCP snooping binding table." (Page 145, DHCP Snooping and ARP Inspection Section) Additionally, the guide notes:
"Dynamic ARP Inspection (DAI) and DHCP snooping are typically configured on access layer switches to protect against exploits from untrusted devices, such as DHCP spoofing and ARP poisoning. These features should be applied to the VLANs where end-user devices connect, not on core switches unless those VLANs are directly connected to untrusted devices." (Page 146, Best Practices Section)
:
HPE Aruba Networking AOS-CX 10.12 Security Guide, DHCP Snooping and ARP Inspection Section, Page 145.
HPE Aruba Networking AOS-CX 10.12 Security Guide, Best Practices Section, Page 146.
NEW QUESTION # 114
What is a benefit of Protected Management Frames (PMF). sometimes called Management Frame Protection (MFP)?
- A. PMF protects clients from DoS attacks based on forged de-authentication frames
- B. PMF helps to protect APs and MCs from unauthorized management access by hackers.
- C. PMF prevents hackers from capturing the traffic between APs and Mobility Controllers.
- D. PMF ensures trial traffic between APs and Mobility Controllers (MCs) is encrypted.
Answer: A
Explanation:
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).
NEW QUESTION # 115
You are setting up an Aruba mobility solution which includes a Mobility Master (MM), Mobility Controllers (MCs), and campus APs (CAPs) for a university. The university plans to enforce WPA2-Enterprise for all users' connections. The university wants to apply one set of access control rules to faculty users' traffic and a different set of rules to students' traffic.
What is the best approach for applying the correct rules to each group?
- A. Create two VLANs, one for faculty and one for students. Apply firewall policies with the correct rules for each group to each VLAN.
- B. Create two VLANs, one for faculty and one for students. Create one set of firewall access control rules that specify faculty IP addresses for the source and a second set of rules that specify the student IP addresses for the source. Apply the rules to the WLAN.
- C. Create two WLANs, one for faculty and one for students. Apply firewall policies with the correct rules for each group to each WLAN.
- D. Create two roles, a "faculty" role and a "student" role. Apply firewall policies with the correct rules for each group to each role.
Answer: D
Explanation:
To differentiate access control for faculty and students, the best approach is to use roles. By creating two roles - "faculty" and "student" - and applying the appropriate firewall policies to each, the university can enforce different access rules for each group. This is more efficient than managing multiple VLANs or WLANs because it allows for role-based access control, which is directly tied to user identity rather than just IP addresses or the network they are connected to.
NEW QUESTION # 116
You have been instructed to look in the ArubaOS Security Dashboard's client list. Your goal is to find clients that belong to the company and have connected to devices that might belong to hackers.
Which client fits this description?
- A. MAC address: d8:50:e6:f3:6e:c5; Client Classification: Interfering; AP Classification: Neighbor
- B. MAC address: d8:50:e6:f3:6e:60; Client Classification: Interfering; AP Classification: Authorized
- C. MAC address: d8:50:e6:f3:70:ab; Client Classification: Interfering; AP Classification: Rogue
- D. MAC address: d8:50:e6:f3:6d:a4; Client Classification: Authorized; AP Classification: Rogue
Answer: D
Explanation:
The ArubaOS Security Dashboard, part of the AOS-8 architecture (Mobility Controllers or Mobility Master), provides visibility into wireless clients and access points (APs) through its Wireless Intrusion Prevention (WIP) system. The goal is to identify clients that belong to the company (i.e., authorized clients) and have connected to devices that might belong to hackers (i.e., rogue APs).
Client Classification:
Authorized: A client that has successfully authenticated to an authorized AP and is recognized as part of the company's network (e.g., an employee device).
Interfering: A client that is not authenticated to the company's network and is considered external or potentially malicious.
AP Classification:
Authorized: An AP that is part of the company's network and managed by the MC/MM.
Rogue: An AP that is not authorized and is suspected of being malicious (e.g., connected to the company's wired network without permission).
Neighbor: An AP that is not part of the company's network but is not connected to the wired network (e.g., a nearby AP from another organization).
The requirement is to find a client that is authorized (belongs to the company) and connected to a rogue AP (might belong to hackers).
Option A: MAC address: d8:50:e6:f3:70:ab; Client Classification: Interfering; AP Classification: Rogue This client is classified as "Interfering," meaning it does not belong to the company. Although it is connected to a rogue AP, it does not meet the requirement of being a company client.
Option B: MAC address: d8:50:e6:f3:6e:c5; Client Classification: Interfering; AP Classification: Neighbor This client is "Interfering" (not a company client) and connected to a "Neighbor" AP, which is not considered a hacker's device (it's just a nearby AP).
Option C: MAC address: d8:50:e6:f3:6e:60; Client Classification: Interfering; AP Classification: Authorized This client is "Interfering" (not a company client) and connected to an "Authorized" AP, which is part of the company's network, not a hacker's device.
Option D: MAC address: d8:50:e6:f3:6d:a4; Client Classification: Authorized; AP Classification: Rogue This client is "Authorized," meaning it belongs to the company, and it is connected to a "Rogue" AP, which might belong to hackers. This matches the requirement perfectly.
The HPE Aruba Networking AOS-8 8.11 User Guide states:
"The Security Dashboard in ArubaOS provides a client list that includes the client classification and the AP classification for each client. A client classified as 'Authorized' has successfully authenticated to an authorized AP and is part of the company's network. A 'Rogue' AP is an unauthorized AP that is suspected of being malicious, often because it is connected to the company's wired network (e.g., detected via Eth-Wired-Mac-Table match). To identify potential security risks, look for authorized clients connected to rogue APs, as this may indicate that a company device has connected to a hacker's AP." (Page 415, Security Dashboard Section) Additionally, the HPE Aruba Networking Security Guide notes:
"An 'Authorized' client is one that has authenticated to an AP managed by the controller, typically an employee or corporate device. A 'Rogue' AP is classified as such if it is not authorized and poses a potential threat, such as being connected to the corporate LAN. Identifying authorized clients connected to rogue APs is critical for detecting potential man-in-the-middle attacks." (Page 78, WIP Classifications Section)
:
HPE Aruba Networking AOS-8 8.11 User Guide, Security Dashboard Section, Page 415.
HPE Aruba Networking Security Guide, WIP Classifications Section, Page 78.
NEW QUESTION # 117
You have been asked to rind logs related to port authentication on an ArubaOS-CX switch for events logged in the past several hours But. you are having trouble searching through the logs What is one approach that you can take to find the relevant logs?
- A. Enable debugging for "portaccess" to move the relevant logs to a buffer.
- B. Configure a logging Tiller for the "port-access" category, and apply that filter globally.
- C. Specify a logging facility that selects for "port-access" messages.
- D. Add the "-C and *-c port-access" options to the "show logging" command.
Answer: D
NEW QUESTION # 118
......
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