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質問 # 45
Which statements regarding 0SPFv2 route redistribution are true for Aruba OS CX switches?
(Select two.)
- A. The "redistribute connected" command will redistribute all connected routes for the switch including local loopback addresses
- B. The "redistribute static route-map connected-routes" command will redistribute all static routes with a matching permit in the route map "connected-routes-
- C. The "redistribute ospf" command will redistribute routes from all OSPF V2 and V3 processes
- D. The "redistribute connected" command will redistribute all connected routes for the switch except local loopback addresses.
- E. The "redistribute static route-map connected-routes" command will redistribute all static routes without a matching deny in the route map "connected-routes".
正解：A、B
解説：
These are two correct statements regarding OSPFv2 route redistribution for Aruba OS CX switches. Route redistribution is a process that allows routes from one routing protocol or source to be injected into another routing protocol or destination. OSPFv2 is a link-state routing protocol that supports route redistribution from various sources, such as connected, static, BGP, etc. The
"redistribute connected" command will redistribute all connected routes for the switch, including local loopback addresses, into OSPFv2. The "redistribute static route-map connected-routes" command will redistribute all static routes that have a matching permit statement in the route map named "connected-routes" into OSPFv2. The other statements are incorrect because they either do not reflect the correct behavior of route redistribution commands or do not exist as valid commands.
質問 # 46
A customer is looking Tor a wireless authentication solution for all of their loT devices that meet the following requirements
- The wireless traffic between the IoT devices and the Access Points must be encrypted
- Unique passphrase per device
- Use fingerprint information to perform role-based access
Which solutions will address the customer's requirements? (Select two.)
- A. MPSK Local with MAC Authentication
- B. Local User Derivation Rules
- C. MPSK Local with EAP-TLS
- D. ClearPass Policy Manager
- E. MPSK and an internal RADIUS server
正解：C、D
解説：
Explanation
The correct answers are C and D.
MPSK (Multi Pre-Shared Key) is a feature that allows multiple PSKs to be used on a single SSID, providing device-specific or group-specific passphrases for enhanced security and deployment flexibility for headless IoT devices1. MPSK requires MAC authentication against a ClearPass Policy Manager server, which returns the encrypted passphrase for the device in a RADIUS VSA2. ClearPass Policy Manager is a platform that provides role- and device-based network access control for any user across any wired, wireless and VPN infrastructure3. ClearPass Policy Manager can also use device profiling and posture assessment to assign roles based on device fingerprint information4.
MPSK Local is a variant of MPSK that allows the user to configure up to 24 PSKs per SSID locally on the device, without requiring ClearPass Policy Manager5. MPSK Local can be combined with EAP-TLS (Extensible Authentication Protocol-Transport Layer Security), which is a secure authentication method that uses certificates to encrypt the wireless traffic between the IoT devices and the access points6. EAP-TLS can also use device certificates to perform role-based access control6.
Therefore, both ClearPass Policy Manager and MPSK Local with EAP-TLS can meet the customer's requirements for wireless authentication, encryption, unique passphrase, and role-based access for their IoT devices.
MPSK and an internal RADIUS server is not a valid solution, because MPSK does not support internal RADIUS servers and requires ClearPass Policy Manager789. MPSK Local with MAC Authentication is not a valid solution, because MAC Authentication does not encrypt the wireless traffic or use fingerprint information for role-based access2. Local User Derivation Rules are not a valid solution, because they do not provide unique passphrase per device or use fingerprint information for role-based access101112.
質問 # 47
What is used to retrieve data stored in a Management Information Base (MIB)?
- A. DSCP
- B. CDP
- C. TLV
- D. SNMPv3
正解：D
解説：
SNMPv3 is a protocol that is used to retrieve data stored in a Management Information Base (MIB), which is a database of managed objects in a network. SNMPv3 provides security and access control features that are not available in earlier versions of SNMP. SNMPv3 can also use encryption to protect the data from unauthorized access or modification.
質問 # 48
For the Aruba CX 6400 switch, what does virtual output queueing (VOQ) implement that is different from most typical campus switches?
- A. large ingress packet buffers
- B. large egress packet buffers
- C. per port ASICs
- D. VSX
正解：A
解説：
Explanation
The Aruba CX 6400 switch is a modular switch that supports high-performance and high-density Ethernet switching for campus and data center networks. One of the features that distinguishes the Aruba CX 6400 switch from most typical campus switches is virtual output queueing (VOQ). VOQ is a technique that implements large ingress packet buffers on each port to prevent head-of-line blocking and packet loss due to congestion2. VOQ allows each port to have multiple queues for different output ports and prioritize packets based on their destination and QoS class2. VOQ enables the Aruba CX 6400 switch to achieve high throughput and low latency for various traffic types and scenarios. References: 2
https://www.arubanetworks.com/assets/ds/DS_CX6400Series.pdf
質問 # 49
When setting up an Aruba CX VSX pair, which information does the Inter-Switch Link Protocol configuration use in the configuration created?
- A. hello interval is 1s by default
- B. hello interval is disabled by default
- C. hello interval is based on the value set by dead interval
- D. hello interval 100ms by default
正解：A
解説：
The reason is that the Inter-Switch Link Protocol (ISLP) is a protocol that enables VSX stack join and synchronization between two VSX peer switches. ISLP uses a hello interval to exchange control messages between the switches.
The hello interval is a parameter that specifies the time interval between sending hello messages.
The default value of the hello interval is 1 second. The hello interval can be configured from 1 second to
10 seconds.
https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/index.html
質問 # 50
How is Multicast Transmission Optimization implemented in an HPE Aruba wireless network?
- A. When this option is enabled the minimum default rate for multicast traffic is set to 12 Mbps for 5 GHz
- B. "The optimal rate for sending multicast frames is based on the highest broadcast rate across all associated clients
- C. The optimal rate for sending multicast frames is based on the lowest unicast rate across all associated clients.
- D. The optimal rate for sending multicast frames is based on the lowest broadcast rate across all associated clients.
正解：C
解説：
Explanation
multicast transmission optimization is a feature that allows the IAP to select the optimal rate for sending broadcast and multicast frames based on the lowest of unicast rates across all associated clients1. When this option is enabled, multicast traffic can be sent at up to 24 Mbps. The default rate for sending frames for 2.4 GHz is 1 Mbps and 5.0 GHz is 6 Mbps. This option is disabled by default1.
質問 # 51
Match the terms below to their characteristics (Options may be used more than once or not at all.)
正解：
解説：
Explanation
a) A device with IP address 10.1.3.7 in a network wants to send the traffic stream to a device with IP address
10.13.4.2 in the other network -> Unicast
b) One/more senders and one/more recipients participate in data transfer traffic -> Multicast c) Sent to all hosts on a remote network -> IP Directed Broadcast d) Sent to all NICs on the same network segment as the source NIC -> Broadcast References: 1 https://www.thestudygenius.com/unicast-broadcast-multicast/ The terms broadcast, IP directed broadcast, multicast, and unicast are different types of communication or data transmission over a network. They differ in how many devices are involved in the communication and how they address the messages. The following table summarizes the characteristics of each term1:
A screenshot of a computer Description automatically generated with medium confidence
質問 # 52
What are the requirements to ensure that WMM is working effectively'? (Select two)
- A. All APs need to be from the AP-5xx series and AP-6xx series which are Wi-Fi CERTIFIED 6.
- B. The APs and the controller are Wi-Fi CERTIFIED for WMM which is enabled
- C. The AP needs to be connected via a tagged VLAN to the wired port
- D. The Client must be Wi-Fi CERTIFIED for WMM and configured for WMM marking.
- E. The Aruba AOS10 APs installed have to be converted to controlled mode
正解：B、D
解説：
These are the correct requirements to ensure that WMM (Wi-Fi Multimedia) is working effectively. WMM is a standard that provides quality of service (QoS) for wireless networks by prioritizing traffic into four categories: voice, video, best effort, and background. To use WMM, both the APs and the controller must be Wi-Fi CERTIFIED for WMM, which means they have passed interoperability tests and comply with the standard. WMM must also be enabled on the APs and the controller, which is usually the default setting. The client device must also be Wi-Fi CERTIFIED for WMM and configured for WMM marking, which means it can tag its traffic with the appropriate priority level based on the application type. The other options are incorrect because they are either not related to WMM or not required for WMM to work. References:
https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos-solutions/wlan-qos/wmm.h
質問 # 53
Which method is used to onboard a new UXI in an existing environment with 802 1X authentication? (The sensor has no cellular connection)
- A. Use the Aruba installer app on your smartphone to scan the barcode
- B. Use the CLI via the serial cable and adjust the initial configuration.
- C. Use the UXI app on your smartphone and connect the UXI via Bluetooth
- D. Connect the new UXI from an already installed one and adjust the initial configuration.
正解：C
解説：
Explanation
To onboard a new UXI in an existing environment with 802.1X authentication, you need to use the UXI app on your smartphone and connect the UXI via Bluetooth. The UXI app allows you to scan the QR code on the UXI sensor and configure its network settings, such as SSID, password, IP address, etc. The Bluetooth connection allows you to communicate with the UXI sensor without requiring any network access or cellular connection. The other options are incorrect because they either do not use the UXI app or do not use Bluetooth. References:
https://www.arubanetworks.com/products/network-management-operations/analytics-monitoring/user-experienc
https://help.centralon-prem.arubanetworks.com/2.5.4/documentation/online_help/content/nms-on-prem/aos-cx/g
質問 # 54
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. QoS shaping
- B. DWRR queuing
- C. Strict queuing
- D. Rate limiting
正解：C
解説：
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
質問 # 55
Refer to the exhibit.
A company has deployed 200 AP-635 access points. To but is not working as expected.
What would be the correct action to fix the issue?
- A. Change the SSID to WPA3-Personal
- B. Change the SSID to WPA3-Enhanced Open
- C. Change the SSID to WPA3-Enterpnse (CNSA).
- D. Change the SSID to WPA3-Enterprise (CCM).
正解：C
解説：
This is the correct action to fix the issue where the SSID is not working as expected. WPA3-Enhanced Open is a new security standard for public networks that uses Opportunistic Wireless Encryption (OWE) to provide encryption and privacy on open, non-password-protected networks. WPA3-Enhanced Open can be configured on an Aruba Access Point by changing the SSID security mode to WPA3-Enhanced Open in Aruba Central or Aruba Instant. The other options are incorrect because they either do not use WPA3-Enhanced Open or do not exist as valid security modes.
References:
https://www.arubanetworks.com/assets/wp/WP_WPA3-Enhanced-Open.pdf
https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instant-ug/wpa3-enhanced- open.htm
質問 # 56
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 Enhanced security
- B. Enable Enhanced PAPI security
- C. Enable GRE security
- D. Enable Secure Mode Enhanced
正解：A
解説：
Explanation
To address the situation of unencrypted tunnels between the CX switch and the Aruba Gateway, the administrator must enable Enhanced security on both devices. Enhanced security is a feature that provides encryption and authentication for GRE tunnels between CX switches and Aruba Gateways using IPSec.
Enhanced security can be enabled globally or per tunnel on both devices using CLI commands or Web UI options. The other options are incorrect because they either do not provide encryption or authentication for GRE tunnels or do not exist as features. References:
https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch05.html
https://www.arubanetworks.com/assets/ds/DS_AOS-CX.pdf
質問 # 57
With the Aruba CX switch configuration, what is the first-hop protocol feature that is used for VSX L3 gateway as per Aruba recommendation?
- A. Active Gateway
- B. SVI with vsx-sync
- C. VRRP
- D. Active-Active VRRP
正解：A
解説：
Active Gateway is the first-hop protocol feature that is used for VSX L3 gateway as per Aruba recommendation. Active Gateway is a feature that allows both VSX peers to act as active gateways for different subnets, eliminating the need for VRRP or other first-hop redundancy protocols. Active Gateway also provides fast failover and load balancing for L3 traffic across the VSX peers. The other options are incorrect because they are either not recommended or not supported by Aruba CX VSX. References:
https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch07.htmlhttps://www.aruba
質問 # 58
A customer is using a legacy application that communicates at layer-2. The customer would like to keep this application working to a remote site connected via layer-3 All legacy devices are connected to a dedicated Aruba CX 6200 switch at each site.
What technology on the Aruba CX 6200 could be used to meet this requirement?
- A. Inclusive Multicast Ethernet Tag (IMET)
- B. Static VXLAN
- C. Generic Routing Encapsulation (GRE)
- D. Ethernet over IP (EolP)
正解：A
解説：
VXLAN is a technology that can be used to meet the requirement of using a legacy application that communicates at layer-2 across a layer-3 network. Static VXLAN is a feature that allows the creation of layer-2 overlay networks over a layer-3 underlay network using VXLAN tunnels. Static VXLAN does not require any control plane protocol or VTEP discovery mechanism, and can be configured manually on the Aruba CX 6200 switches. The other options are incorrect because they either do not support layer-2 communication over layer-3 network or are not supported by Aruba CX 6200 switches. Reference: https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch03.html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch05.html
質問 # 59
What is an OSPF transit network?
- A. a network that uses tunnels to connect two areas
- B. a special network that connects two different areas
- C. a network that connects to a different routing protocol
- D. a network on which a router discovers at least one neighbor
正解：B
解説：
OSPF is a link-state routing protocol that divides a network into areas. An area is a logical grouping of routers that share the same link-state information. Area 0 is the backbone area that connects all other areas. A transit network is a special network that connects two different areas.
A transit network must belong to Area 0 and have at least two OSPF routers attached to it. A transit network allows traffic from one area to pass through another area without changing the area ID.
質問 # 60
Your customer has four (4) Aruba 7200 Series Gateways and two (2) 7000 Series Gateways. The customer wants to form a cluster with these Gateways. What design consideration would prevent you from using all of those Gateways?
- A. A combination of 7200 series and 7000 series gateways supports up to 4 nodes
- B. The AP load should be lowest value of worst-case scenario load.
- C. A heterogeneous cluster is not supported in AOS 10.x.
- D. Multiple versions between Gateways in the same cluster profile are not allowed AOS 10.x.
正解：D
解説：
Explanation
The reason is that AOS 10.x does not support clustering gateways with different versions in the same cluster profile. A cluster profile defines the configuration settings for a group of gateways that are managed by Aruba Central.
According to the Aruba documentation2, "You can combine 7200 Series and 7000 Series gateways in the same cluster with a maximum size of four devices with reduced AP client capacity on 7000 Series gateways."
質問 # 61
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