試験の準備方法-ハイパスレートのHPE6-A78最新知識試験-一番優秀なHPE6-A78学習指導It-Passportsが提供した問題集をショッピングカートに入れて100分の自信で試験に参加して、成功を楽しんで、一回だけHPのHPE6-A78試験に合格するのが君は絶対後悔はしません。 HP Aruba Certified Network Security Associate Exam 認定 HPE6-A78 試験問題 (Q50-Q55):質問 # 50
A client has accessed an HTTPS server at myhost1.example.com using Chrome. The server sends a certificate that includes these properties:
Subject name: myhost.example.com
SAN: DNS: myhost.example.com; DNS: myhost1.example.com
Extended Key Usage (EKU): Server authentication
Issuer: MyCA_Signing
The server also sends an intermediate CA certificate for MyCA_Signing, which is signed by MyCA. The client's Trusted CA Certificate list does not include the MyCA or MyCA_Signing certificates.
Which factor or factors prevent the client from trusting the certificate?
A. The certificate lacks a valid SAN, and the client does not have the correct trusted CA certificates.
B. The client does not have the correct trusted CA certificates.
C. The certificate lacks a valid SAN.
D. The certificate lacks the correct EKU.
正解：B
解説：
This question is identical to Question 17, with the same certificate properties and scenario. The client (Chrome browser) accesses an HTTPS server at myhost1.example.com, and the server presents a certificate with:
Subject name: myhost.example.com
SAN: DNS: myhost.example.com; DNS: myhost1.example.com
EKU: Server authentication
Issuer: MyCA_Signing (intermediate CA)
The intermediate CA certificate (MyCA_Signing) is signed by MyCA (root CA).
The client's Trusted CA Certificate list does not include MyCA or MyCA_Signing.
The certificate validation process is the same as in Question 17:
Name Validation: The SAN includes "myhost1.example.com," which matches the server's hostname, so this passes.
EKU Validation: The EKU is "Server authentication," which is correct for HTTPS, so this passes.
Chain of Trust Validation: The client attempts to build a chain from the server's certificate to a trusted root CA:
Server certificate → MyCA_Signing → MyCA Since MyCA is not in the client's Trusted CA Certificate list, the chain cannot be validated, and the client does not trust the certificate.
Option A, "The client does not have the correct trusted CA certificates," is correct. The absence of MyCA in the client's trust store prevents the client from validating the certificate chain.
Option B, "The certificate lacks a valid SAN," is incorrect because the SAN includes "myhost1.example.com," which is valid.
Option C, "The certificate lacks the correct EKU," is incorrect because the EKU is correctly set to "Server authentication." Option D, "The certificate lacks a valid SAN, and the client does not have the correct trusted CA certificates," is incorrect because the SAN is valid; the only issue is the missing trusted CA certificates.
The HPE Aruba Networking AOS-CX 10.12 Security Guide states:
"For a client to trust a server's certificate during HTTPS communication, the client must validate the certificate chain to a trusted root CA in its trust store. If the root CA (e.g., MyCA) or intermediate CA (e.g., MyCA_Signing) is not in the client's Trusted CA Certificate list, the chain of trust cannot be established, and the client will reject the certificate. The Subject Alternative Name (SAN) must include the server's hostname, and the Extended Key Usage (EKU) must include 'Server authentication' for HTTPS." (Page 205, Certificate Validation Section) Additionally, the HPE Aruba Networking Security Fundamentals Guide notes:
"A common reason for certificate validation failure is the absence of the root CA certificate in the client's trust store. For example, if a server's certificate is issued by an intermediate CA (e.g., MyCA_Signing) that chains to a root CA (e.g., MyCA), the client must have the root CA certificate in its Trusted CA Certificate list to trust the chain." (Page 45, Certificate Trust Issues Section)
:
HPE Aruba Networking AOS-CX 10.12 Security Guide, Certificate Validation Section, Page 205.
HPE Aruba Networking Security Fundamentals Guide, Certificate Trust Issues Section, Page 45.
質問 # 51
What purpose does an initialization vector (IV) serve for encryption?
A. It makes encryption algorithms more secure by ensuring that same plaintext and key can produce different ciphertext.
B. It enables programs to convert easily-remembered passphrases to keys of a correct length.
C. It enables the conversion of asymmetric keys into keys that are suitable for symmetric encryption.
D. It helps parties to negotiate the keys and algorithms used to secure data before data transmission.
正解：A
解説：
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.
質問 # 52
Refer to the exhibit.
This company has ArubaOS-Switches. The exhibit shows one access layer switch, Swllcn-2. as an example, but the campus actually has more switches. The company wants to slop any internal users from exploiting ARP What Is the proper way to configure the switches to meet these requirements?
A. On Switch-1, enable ARP protection globally, and enable ARP protection on ail VLANs.
B. On Swltch-2, enable DHCP snooping globally and on VLAN 201 before enabling ARP protection
C. On Switch-2, make ports connected to employee devices trusted ports for ARP protection
D. On Swltch-2, configure static PP-to-MAC bindings for all end-user devices on the network
正解：B
解説：
To prevent users from exploiting Address Resolution Protocol (ARP) on a network with ArubaOS-Switches, the correct approach would be to enable DHCP snooping globally and on VLAN 201 before enabling ARP protection, as stated in option C. DHCP snooping acts as a foundation by tracking and securing the association of IP addresses to MAC addresses. This allows ARP protection to function effectively by ensuring that only valid ARP requests and responses are processed, thus preventing ARP spoofing attacks. Trusting ports that connect to employee devices directly could lead to bypassing ARP protection if those devices are compromised.
The company's goal is to prevent internal users from exploiting ARP within their ArubaOS-Switch network. Let's break down the options:
Option A (Incorrect): Enabling ARP protection globally on Switch-1 and all VLANs is not the best approach. ARP protection should be selectively applied where needed, not globally. It's also not clear why Switch-1 is mentioned when the exhibit focuses on Switch-2.
Option B (Incorrect): Making ports connected to employee devices trusted for ARP protection is a good practice, but it's not sufficient by itself. Trusted ports allow ARP traffic, but we need an additional layer of security.
Option C (Correct): This is the recommended approach. Here's why:
DHCP Snooping: First, enable DHCP snooping globally. DHCP snooping helps validate DHCP messages and builds an IP-MAC binding table. This table is crucial for ARP protection to function effectively.
VLAN 201: Enable DHCP snooping specifically on VLAN 201 (as shown in the exhibit). This ensures that DHCP messages within this VLAN are validated.
ARP Protection: Once DHCP snooping is in place, enable ARP protection. ARP requests/replies from untrusted ports with invalid IP-to-MAC bindings will be dropped. This prevents internal users from exploiting ARP for attacks like man-in-the-middle.
Option D (Incorrect): While static ARP bindings can enhance security, they are cumbersome to manage and don't dynamically adapt to changes in the network.
:
ArubaOS-Switch Management and Configuration Guide for WB_16_10 - Chapter 15: IP Routing Features Aruba Security Guide
質問 # 53
What is one way that WPA3-PerSonal enhances security when compared to WPA2-Personal?
A. WPA3-Personai is more resistant to passphrase cracking Because it requires passphrases to be at least 12 characters
B. WPA3-Perscn3i is more secure against password leaking Because all users nave their own username and password
C. WPA3-Personai prevents eavesdropping on other users' wireless traffic by a user who knows the passphrase for the WLAN.
D. WPA3-Personal is more complicated to deploy because it requires a backend authentication server
正解：B
質問 # 54
You are troubleshooting an authentication issue for Aruba switches that enforce 802 IX10 a cluster of Aruba ClearPass Policy Manager (CPPMs) You know that CPPM Is receiving and processing the authentication requests because the Aruba switches are showing Access-Rejects in their statistics However, you cannot find the record tor the Access-Rejects in CPPM Access Tracker What is something you can do to look for the records?
A. Verify that you are logged in to the CPPM Ul with read-write, not read-only, access
B. Make sure that CPPM cluster settings are configured to show Access-Rejects
C. Go to the CPPM Event Viewer, because this is where RADIUS Access Rejects are stored.
D. Click Edit in Access viewer and make sure that the correct servers are selected.
正解：B
解説：
If Access-Reject records are not showing up in the CPPM Access Tracker, one action you can take is to ensure that the CPPM cluster settings are configured to display Access-Rejects. Cluster-wide settings in CPPM can affect which records are visible in Access Tracker. Ensuring that these settings are correctly configured will allow you to view all relevant authentication records, including Access-Rejects.
:
ClearPass Policy Manager documentation that includes information on cluster settings and Access Tracker configurations.
Troubleshooting guides for ClearPass that provide steps to resolve issues with viewing authentication records.
