Question # 1 A company deployed Dynamic Segmentation with their CX switches and Gateways After performing a security audit on their network, they discovered that the tunnels built between the CX switch and the Aruba Gateway are not encrypted. The company is concerned that bad actors could try to insert spoofed messages on the Gateway to disrupt communications or obtain information about the network.
Which action must the administrator perform to address this situation? A. Enable Secure Mode EnhancedB. Enable Enhanced securityC. Enable Enhanced PAPI securityD. Enable GRE security
Click for Answer
C. Enable Enhanced PAPI security
Answer Description Explanation:
PAPI is the protocol that is used to establish tunnels between the CX switch and the Aruba Gateway for Dynamic Segmentation1. By default, PAPI uses a simple checksum to verify the integrity of the messages, but it does not encrypt the payload2. This could expose the network to spoofing or replay attacks by malicious actors. To address this situation, the administrator must enable Enhanced PAPI security, which uses AES-256 encryption and HMAC-SHA1 authentication to protect the tunnel traffic2. Enhanced PAPI security can be enabled on the CX switch by using the command system papi enhanced-security enable3. This will ensure that the tunnels built between the CX switch and the Aruba Gateway are encrypted and authenticated.
Question # 2 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 # 3 What is a primary benefit of BSS coloring? A. BSS color tags improve performance by allowing APS on the same channel to be farther apart B. BSS color tags improve security by identifying rogue APS and tagging them as threats. C. BSS color tags are applied on the wireless controllers and can reduce the threshold for interference_ D. BSS color tags are applied to WI-Fi channels and can reduce the threshold tor interference
Click for Answer
D. BSS color tags are applied to WI-Fi channels and can reduce the threshold tor interference
Answer Description Explanation:
The primary benefit of BSS coloring is D. BSS color tags are applied to Wi-Fi channels and can reduce the threshold for interference. BSS coloring is a mechanism that allows Wi-Fi 6 devices to mark each frame with a color code that identifies the BSS (Basic Service Set) it belongs to. This helps differentiate between frames from different BSSs that share the same channel and avoid unnecessary collisions and backoffs. BSS coloring also introduces an adaptive threshold for interference, which means that Wi-Fi 6 devices can adjust the signal strength value that determines whether a channel is busy or not based on the current network environment. This allows for more efficient use of spectrum and higher throughput in dense scenarios12.
Question # 4 A network administrator is troubleshooting some issues guest users are having when connecting and authenticating to the network The access switches are AOS-CX switches.
What command should the administrator use to examine information on which role the guest user has been assigned? A. show aaa authentication port-access interface all client-statusB. show port-access captiveportal profileC. show port-access roleD. diag-dump captiveportal client verbose
Click for Answer
A. show aaa authentication port-access interface all client-status
Answer Description Explanation:
The show aaa authentication port-access interface all client-status command displays the status of all clients authenticated by port-based access control on all interfaces. The output includes the MAC address, user role, VLAN ID, and session timeout for each client. This command can be used to examine information on which role the guest user has been assigned by the AOS-CX switch.
Question # 5 You need to drop excessive broadcast traffic on an ingress port or an ArubaOS-CX switch. What is the best feature to use for this task? A. DWRR queuingB. Strict queuingC. Rate limitingD. QoS shaping
Click for Answer
C. Rate limiting
Answer Description Explanation:
According to the Aruba Documentation Portal1, the ArubaOS-CX switch supports various features to control the ingress traffic on specific ports, such as rate limiting, QoS shaping, and access control. These features can help reduce the impact of excessive broadcast traffic on the network performance and availability.
This is because rate limiting is a feature that allows you to limit the inbound or outbound traffic on a port based on a percentage of the port capacity or a fixed amount of bytes per second. Rate limiting can help prevent broadcast storms by reducing the amount of broadcast packets that enter or leave a port.
Question # 6 What is an OSPF transit network? A. a network that uses tunnels to connect two areasB. a special network that connects two different areasC. a network on which a router discovers at least one neighborD. a network that connects to a different routing protocol
Click for Answer
A. a network that uses tunnels to connect two areas
Answer Description Explanation:
An OSPF transit network is a network that has at least two routers that are connected by a multi-access link and can forward traffic for other networks1. A transit network is different from a stub network, which has only one router connected to it and does not forward traffic for other networks2. A transit network is also different from a virtual link, which is a logical connection between two areas that are not physically adjacent2. A transit network is not necessarily connected to a different routing protocol, although it can be if the router performs redistribution2. Therefore, the correct answer is C. A network on which a router discovers at least one neighbor.
Question # 7 You are are doing tests in your lab and with the following equipment specifications:
• AP1 has a radio that generates a 16 dBm signal.
• AP2 has a radio that generates a 13 dBm signal.
• AP1 has an antenna with a gain of 8 dBi.
• AP2 has an antenna with a gain of 12 dBi. The antenna cable for AP1 has a 4 dB loss. The antenna cable for AP2 has a 3 dB loss.
What would be the calculated Equivalent Isotropic Radiated Power (EIRP) for AP1? A. -9 dBmB. 20 dBmC. 40 dBmD. 15 dBm
Click for Answer
B. 20 dBm
Answer Description Explanation:
The Equivalent Isotropic Radiated Power (EIRP) is the measured radiated power of an antenna in a specific direction. It is also called Equivalent Isotropic Radiated Power. It is the output power when a signal is concentrated into a smaller area by the Antenna. The EIRP can take into account the losses in transmission line, connectors and includes the gain of the antenna. It is represented in dB2. The formula for EIRP is:
EIRP=PT−Lc+Ga
where PT is the output power of the transmitter in dBm, Lc is the cable and connector loss in dB, and Ga is the antenna gain in dBi.
For AP1, the EIRP can be calculated as:
EIRP=16−4+8=20 dBm
Therefore, the answer B is correct.
References: 1: Aruba Campus Access documents and learning resources 2: EIRP Calculator - Effective Isotropic Radiated Power
Question # 8 Your customer is interested in hearing more about how roles can help keep consistent policy enforcement in a distributed overlay fabric How would you explain this concept to them' A. Group Based Policy ID is applied on egress VTEP after device authentication and policy is enforced on ingress VTEPB. Role-based policies are tied to IP addresses which have an advantage over IP-based policies and role names are sent between VTEPsC. Group Based Policy ID is applied on ingress VTEP after device authentication and policy is enforced on egress VTEPD. Role-based policies enhance User Based Tunneling across the campus network and the policy traffic is protected with iPsec
Click for Answer
C. Group Based Policy ID is applied on ingress VTEP after device authentication and policy is enforced on egress VTEP
Answer Description Explanation:
This is the correct explanation of how roles can help keep consistent policy enforcement in a distributed overlay fabric. Roles are used to assign group based policy IDs (GBPs) to devices after they authenticate with ClearPass or a local database. GBPs are then used to tag the traffic from the devices and send them to the ingress VTEP, which applies the GBP on the VXLAN header. The egress VTEP then enforces the policy based on the GBP and the destination device. The other options are incorrect because they either do not describe the correct sequence of events or do not use the correct terms.
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