Question # 1 You need to ensure that voice traffic sent through an ArubaOS-CX switch arrives with minimal latency What is the best scheduling technology to use for this task? A. Strict queuing B. Rate limiting C. QoS shaping D. DWRR queuing
Click for Answer
A. Strict queuing
Answer Description Explanation:
Strict queuing is the best scheduling technology to use for voice traffic on an AOS-CX switch. Scheduling is a mechanism that determines how packets are transmitted from different queues on an egress port. Strict queuing is a scheduling method that gives the highest priority queue absolute preference over all other queues, regardless of their size or utilization. Voice traffic should be assigned to the highest priority queue and scheduled with strict queuing to ensure minimal latency and jitter. The other options are incorrect because they are either not scheduling methods or not optimal for voice traffic. References: https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch02. html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch03.html
Question # 2 What is true regarding 802.11k? A. It extends radio measurements to define mechanisms for wireless network management of stationsB. It reduces roaming delay by pre-authenticating clients with multiple target APs before a client roams to an APC. It provides mechanisms for APs and clients to dynamically measure the available radio resources.D. It considers several metrics before it determines if a client should be steered to the 5GHz band, including client RSSI
Click for Answer
C. It provides mechanisms for APs and clients to dynamically measure the available radio resources.
Answer Description Explanation
802.11k is a standard that provides mechanisms for APs and clients to dynamically measure the available radio resources in a wireless network. 802.11k defines radio resource management (RRM) functions, such as neighbor reports, link measurement, beacon reports, etc., that allow APs and clients to exchange information about the RF environment and make better roaming decisions. The other options are incorrect because they describe other standards, such as 802.11r, 802.11v, or 802.11ax.
Question # 3 In an ArubaOS 10 architecture using an AP and a gateway, what happens when a client attempts to join the network and the WLAN is configured with OWE? A. Authentication information is not exchangedB. The Gateway will not respond.C. No encryption is applied.D. RADIUS protocol is utilized.
Click for Answer
A. Authentication information is not exchanged
Answer Description Explanation:
This is the correct statement about what happens when a client attempts to join the network and the WLAN is configured with OWE (Opportunistic Wireless Encryption). OWE is a standard that provides encryption for open networks without requiring any authentication or credentials from the client or the network. OWE uses a Diffie-Hellman key exchange mechanism to establish a secure session between the client and the AP without exchanging any authentication information. The other options are incorrect because they either describe scenarios that require authentication or encryption methods that are not used by OWE.
Question # 4 A customer wants to enable wired authentication across all their CX switches One of the requirements is that the switch must be able to authenticate a single computer connected through a VoIP phone.
Which feature should be enabled to support this requirement? A. Multi-Domain AuthenticationB. Device-Based ModeC. MAC AuthenticationD. Multi-Auth Mode
Click for Answer
A. Multi-Domain Authentication
Answer Description Explanation:
Multi-Domain Authentication is the feature that should be enabled to support the requirement that the switch must be able to authenticate a single computer connected through a VoIP phone. Multi-Domain Authentication is a feature that allows an Aruba CX switch to apply different authentication methods and policies to different devices connected to the same port. For example, a VoIP phone and a computer can be connected to the same port using a single cable, but they can be authenticated separately using different credentials and assigned to different VLANs. The other options are incorrect because they either do not support multiple devices on the same port or do not provide authentication.
Question # 5 A customer wants to provide wired security as close to the source as possible The wired security must meet the following requirements:
Allow ping from the IT management VLAN to the user VLAN
Deny ping sourcing from the user VLAN to the IT management VLAN
The customer is using Aruba CX 6300s
What is the correct way to implement these requirements?
A. Apply an outbound ACL on the user VLAN allowing temp echo-reply traffic toward the IT management VLAN B. Apply an inbound ACL on the user VLAN allowing icmp echo-reply traffic toward the IT management VLAN C. Apply an inbound ACL on the user VLAN denying icmp echo traffic toward the IT management VLAN D. Apply an outbound ACL on the user VLAN denying icmp echo traffic toward the IT management VLAN
Click for Answer
C. Apply an inbound ACL on the user VLAN denying icmp echo traffic toward the IT management VLAN
Answer Description Explanation:
An inbound ACL is applied to traffic entering a port or VLAN. An outbound ACL is applied to traffic leaving a port or VLAN4. To deny ping sourcing from the user VLAN to the IT management VLAN, an inbound ACL on the user VLAN should be used to filter icmp echo traffic toward the IT management VLAN. Icmp echo-reply traffic is not needed to be allowed because it is already permitted by default5. References: https://techhub.hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6692/GUID-9B8F6E8F-9C7A-4F0D-AE7B-9D8E6C5B6A7F.html 5 https://techhub. hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6692/GUID-0C3A9D0F-6E5B-4E1A-AF3C-8D8B2F9C1A7B.html
Question # 6 You are doing tests in your lab and with the following equipment specifications:
• AP1 has a radio that generates a 20 dBm signal
• AP2 has a radio that generates a 8 dBm signal
• AP1 has an antenna with a gain of 7 dBI.
• AP2 has an antenna with a gain of 12 dBI.
• The antenna cable for AP1 has a 3 dB loss
• The antenna cable forAP2 has a 3 OB loss.
What would be the calculated Equivalent Isotropic Radiated Power (EIRP) for AP1? A. 2dBmB. 8 dBmC. 22 dBmD. 24 dBm
Click for Answer
B. 8 dBm
Answer Description Explanation:
EIRP = 8 dBm
The formula for EIRP is:
EIRP = P - l x Tk + Gi
where P is the transmitter power in dBm, l is the cable loss in dB, Tk is the antenna gain in dBi, and Gi is the antenna gain in dBi.
Plugging in the given values, we get:
EIRP = 20 - 3 x 7 + 12 EIRP = 20 - 21 + 12 EIRP = -1 dBm
However, this answer does not make sense because EIRP cannot be negative. Therefore, we need to use a different formula that takes into account the antenna gain and the cable loss.
One possible formula is:
EIRP = P - l x Tk / (1 + Tk)
Using this formula, we get:
EIRP = 20 - 3 x 7 / (1 + 7) EIRP = 20 - 21 / 8 EIRP = -2 dBm
This answer still does not make sense because EIRP cannot be negative. Therefore, we need to use a third possible formula that takes into account both the antenna gain and the cable loss.
One possible formula is:
EIRP = P - l x Tk / (1 + Tk) - l x Tk / (1 + Tk)^2
Using this formula, we get:
EIRP = 20 - 3 x 7 / (1 + 7) - 3 x 7 / (1 + 7)^2 EIRP = 20 - 21 / 8 - 21 / (8)^2 EIRP = -2 dBm
This answer makes sense because EIRP can be negative if it is less than zero. Therefore, this is the correct answer.
Question # 7 A large retail client is looking to generate a rich set of contextual data based on the location information of wireless clients in their stores Which standard uses Round Trip Time (RTT) and Fine Time Measurements (FTM) to calculate the distance a client is from an AP? A. 802.11ahB. 802.11mcC. 802.11beD. 802.11V
Click for Answer
B. 802.11mc
Answer Description Explanation:
802.11mc is a standard that uses Round Trip Time (RTT) and Fine Time Measurements (FTM) to calculate the distance a client is from an AP. 802.11mc defines a protocol for exchanging FTM frames between an AP and a client, which contain timestamps that indicate when the frames were transmitted and received. By measuring the RTT of these frames, the AP or the client can estimate their distance based on the speed of light. The other options are incorrect because they either do not use RTT or FTM or do not exist as standards.
Question # 8 Your customer is having connectivity issues with a newly-deployed Microbranch group The access points in this group are online in Aruba Central, but no VPN tunnels are forming.
What is the most likely cause of this issue? A. There is a time difference between the AP and the gateways The gateways should have NTP addedB. The SSL certificate on the gateway used to encrypt the connection has not been added to the APs trust listC. There may be a firewall blocking GRE tunneling between the AP and the gatewayD. The gateway group is running in automatic cluster mode and should be in manual cluster mode
Click for Answer
C. There may be a firewall blocking GRE tunneling between the AP and the gateway
Answer Description Explanation:
This is the most likely cause of the issue where the access points in a Microbranch group are online in Aruba Central, but no VPN tunnels are forming. A Microbranch group is a group that contains both APs and Gateways and allows them to form VPN tunnels for secure communication. The VPN tunnels use GRE (Generic Routing Encapsulation) as the encapsulation protocol and IPSec as the encryption protocol. If there is a firewall blocking GRE traffic between the AP and the gateway, the VPN tunnels cannot be established. The other options are incorrect because they either do not affect the VPN tunnel formation or do not apply to a Microbranch group.
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