HP HPE6-A78 Dumps

The AP is classified as a rogue because it is connected to your LAN and is transmitting wireless traffic with your network's default gateway's MAC address as a source MAC. In this scenario, the 'Match method = Exact match' and 'Match type = Eth-GW-wired-Mac-Table' indicates that the rogue AP has been detected by matching the Ethernet gateway's MAC address, which is on the wired network, implying that the rogue AP is connected to the corporate LAN. Since the AP does not belong to the company, its presence on the network is unauthorized and is thus classified as a rogue AP.

In an HPE Aruba Networking AOS-8 Mobility Controller (MC), firewall rules are applied based on the user role assigned to a client. The rules are evaluated in order, and the first matching rule determines the action (permit or deny) for the packet. The client’s role has the following firewall rules:

ipv4 any any svc-dhcp permit: Permits DHCP traffic (UDP ports 67 and 68) from any source to any destination.

ipv4 user 10.5.5.20 svc-dns permit: Permits DNS traffic (UDP port 53) from the user to the IP address 10.5.5.20.

ipv4 user 10.1.5.0 255.255.255.0 https permit: Permits HTTPS traffic (TCP port 443) from the user to the subnet 10.1.5.0/24.

ipv4 user 10.1.0.0 255.255.0.0 https deny_opt: Denies HTTPS traffic from the user to the subnet 10.1.0.0/16, with the deny_opt action (which typically means deny with an optimized action, such as dropping the packet without logging).

ipv4 user any any permit: Permits all other traffic from the user to any destination.

The question asks how the MC treats HTTPS packets (TCP port 443) to two IP addresses: 10.1.20.1 and 10.5.5.20.

HTTPS packet to 10.1.20.1:

Rule 1: Does not match (traffic is HTTPS, not DHCP).

Rule 2: Does not match (destination is 10.1.20.1, not 10.5.5.20; traffic is HTTPS, not DNS).

Rule 3: Does not match (destination 10.1.20.1 is not in the subnet 10.1.5.0/24).

Rule 4: Matches (destination 10.1.20.1 is in the subnet 10.1.0.0/16, and traffic is HTTPS). The action is deny_opt, so the packet is denied.

HTTPS packet to 10.5.5.20:

Rule 1: Does not match (traffic is HTTPS, not DHCP).

Rule 2: Does not match (traffic is HTTPS, not DNS).

Rule 3: Does not match (destination 10.5.5.20 is not in the subnet 10.1.5.0/24).

Rule 4: Does not match (destination 10.5.5.20 is not in the subnet 10.1.0.0/16).

Rule 5: Matches (catches all other traffic). The action is permit, so the packet is permitted.

Therefore, the HTTPS packet to 10.1.20.1 is denied, and the HTTPS packet to 10.5.5.20 is permitted.

Option A, "Both packets are denied," is incorrect because the packet to 10.5.5.20 is permitted.

Option B, "The first packet is permitted, and the second is denied," is incorrect because the packet to 10.1.20.1 (first) is denied, and the packet to 10.5.5.20 (second) is permitted.

Option C, "Both packets are permitted," is incorrect because the packet to 10.1.20.1 is denied.

Option D, "The first packet is denied, and the second is permitted," is correct based on the rule evaluation.

The HPE Aruba Networking AOS-8 8.11 User Guide states:

"Firewall policies on the Mobility Controller are evaluated in order, and the first matching rule determines the action for the packet. For example, a rule such as ipv4 user 10.1.0.0 255.255.0.0 https deny_opt will deny HTTPS traffic to the specified subnet, while a subsequent rule like ipv4 user any any permit will permit all other traffic that does not match earlier rules. The ‘user’ keyword in the rule refers to the client’s IP address, and the rules are applied to traffic initiated by the client." (Page 325, Firewall Policies Section)

Additionally, the guide notes:

"The deny_opt action in a firewall rule drops the packet without logging, optimizing performance for high-volume traffic. Rules are processed sequentially, and only the first matching rule is applied." (Page 326, Firewall Actions Section)

HPE Aruba Networking ClearPass Policy Manager (CPPM) uses device profiling to identify and classify endpoints on the network, enabling granular access control based on device type, OS, or other attributes. CPPM supports both passive and active profiling methods.

Option C, "CPPM can analyze settings such as TTL and time window size in endpoints' TCP traffic in order to fingerprint the OS," is correct. TCP fingerprinting is a passive profiling method used by CPPM. It involves analyzing TCP packet headers, such as the Time To Live (TTL) value and TCP window size, which vary between operating systems (e.g., Windows, Linux, macOS). CPPM captures this traffic (e.g., via mirrored traffic from a switch or controller) and matches the TCP attributes against its fingerprint database to identify the OS of the endpoint.

Option A, "CPPM can use Wireshark to actively probe devices, analyze their traffic patterns, and construct an endpoint profile," is incorrect. CPPM does not use Wireshark for profiling; Wireshark is a third-party packet analysis tool. CPPM has its own built-in profiling engine and does not rely on external tools like Wireshark for active probing.

Option B, "CPPM can use SNMP to configure Aruba switches and mobility devices to mirror client traffic to CPPM for analysis," is incorrect. While CPPM can receive mirrored traffic for profiling (e.g., via SPAN or mirror ports), it does not use SNMP to configure the mirroring. The configuration of traffic mirroring is typically done manually on the switch or controller (e.g., using a datapath mirror on an MC), not via SNMP by CPPM.

Option D, "CPPM can analyze settings such as TCP/UDP ports used for HTTP, DHCP, and DNS in endpoints' traffic to fingerprint the OS," is incorrect. While CPPM does analyze HTTP, DHCP, and DNS traffic for profiling, it does not fingerprint the OS based on TCP/UDP ports. Instead, it uses attributes like DHCP Option 55 (for DHCP fingerprinting) or HTTP User-Agent strings (for HTTP fingerprinting) to identify devices, not the ports themselves.

The HPE Aruba Networking ClearPass Policy Manager 6.11 User Guide states:

"ClearPass supports TCP fingerprinting as a passive profiling method to identify the operating system of endpoints. By analyzing TCP packet headers, such as the Time To Live (TTL) value and TCP window size, ClearPass can fingerprint the OS of a device. For example, Windows devices typically have a TTL of 128, while Linux devices often have a TTL of 64. These attributes are matched against ClearPass’s fingerprint database to classify the device." (Page 248, TCP Fingerprinting Section)

Additionally, the ClearPass Device Insight Data Sheet notes:

"ClearPass uses passive profiling techniques like TCP fingerprinting to identify device operating systems. By examining TCP attributes such as TTL and window size, ClearPass can accurately determine whether a device is running Windows, Linux, macOS, or another OS, enabling precise policy enforcement." (Page 3, Profiling Methods Section)