Changed HPE6-A78 Exam Questions

The primary purpose of an Initialization Vector (IV) in encryption is to ensure that the same plaintext encrypted with the same encryption key will produce different ciphertext each time it is encrypted. This variability is crucial for securing repetitive data patterns and preventing certain types of cryptographic attacks, such as replay or pattern analysis attacks. The IV adds randomness to the encryption process, making it more secure by ensuring that encrypted messages are unique, even if the plaintext and key remain unchanged. This prevents attackers from deducing patterns or inferring any useful information from repeated ciphertext.

If clients cannot authenticate and there is no record of the authentication attempt in Aruba ClearPass Access Tracker, two possible problems that could cause this symptom are:

• The RADIUS shared secret does not match between the switch and CPPM. This mismatch would prevent the switch and CPPM from successfully communicating, so authentication attempts would fail, and no record would appear in Access Tracker.
• CPPM does not have a network device profile defined for the switch's IP address. Without a network device profile, CPPM would not recognize authentication attempts coming from the switch and would not process them, resulting in no logs in Access Tracker.

The other options are incorrect because:

• Users logging in with the wrong credentials would still generate an attempt record in Access Tracker.
• Clients configured to use a mismatched EAP method would also generate an attempt record in Access Tracker.
• Clients not configured to trust the root CA certificate for CPPM's RADIUS/EAP certificate might fail authentication, but the attempt would still be logged in Access Tracker.

Referring to the exhibit, the ArubaOS Mobility Controller treats HTTPS packets based on the firewall rules applied to the client. The rule that allows svc-https service for destination IP range 10.1.0.0 255.255.0.0 would permit an HTTPS packet to 10.1.10.10 since this IP address falls within the specified range. There are no rules shown that would allow traffic to the IP address 203.0.13.5; hence, the packet to this address would be dropped.

References:

• ArubaOS firewall configuration guides detailing how firewall rules are interpreted and applied to traffic.
• Network security textbooks explaining firewall rule processing and packet filtering based on source and destination IP addresses.

For an ArubaOS-CX switch enforcing 802.1X on a port without any fallback options or port-access roles configured, and where the supplicant on the connected client has not completed authentication, the only type of traffic the authenticator accepts from the client is EAP (Extensible Authentication Protocol). EAP is a universal authentication framework used in 802.1X for message exchange during the authentication process. The switch allows EAP packets because they are necessary for the client and the authentication server to perform the authentication process. This is standard behavior for 802.1X authenticators, which is to permit EAP traffic to pass through even before authentication is successful to facilitate the authentication exchange. This information is supported by the IEEE 802.1X standard and ArubaOS-CX security configuration guides.