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質問 # 15
What is indicated by a solid amber radio status LED on an Aruba AP?
- A. The radio is working the 5 GHz band only.
- B. The radio is working in mesh mode
- C. Not enough PoE is provided from the switch to power both radios of the AP
- D. The radio is enabled in monitor or spectrum analysis mode
正解：C
解説：
A solid amber radio status LED on an Aruba Access Point (AP) typically indicates a power issue, specifically that not enough Power over Ethernet (PoE) is being provided from the switch to fully power all functionalities of the AP, including both of its radios. In environments where APs are powered via PoE, it is crucial to ensure that the switch supplying the power is capable of delivering sufficient power for the AP's requirements. If the AP does not receive enough power, it may disable certain features or radios to conserve energy, which is indicated by the solid amber LED. This situation is common in scenarios where the switch provides only 802.3af PoE rather than the more powerful 802.3at PoE+ needed by some high-performance APs to operate all features, including dual radios, at full capacity.
質問 # 16
A network technician is troubleshooting one new AP at a branch office that will not receive Its configuration from Aruba Central The other APs at the branch are working as expected The output of the 'show ap debug cloud-server command' shows that the "cloud conflg received" Is FALSE.
After confirming the new AP has internet access, what would you check next?
- A. Disable and enable activate to trigger provisioning refresh
- B. Disable and enable Aruba Central to trigger configuration refresh
- C. Verify the AP can ping the device on arubanetworks.com
- D. Verify the AP has a license assigned
正解：D
解説：
Explanation
If the AP has internet access but does not receive its configuration from Aruba Central, one possible reason is that the AP does not have a license assigned in Aruba Central. A license is required for each AP to be managed by Aruba Central.
References:https://www.arubanetworks.com/techdocs/Central/2.5.2-GA/HTML_frameset.htm#GUID-8F0E7E8B
質問 # 17
Refer to the exhibit.
In the given topology, a pair of Aruba CX 8325 switches are in a VSX stack using the active gateway What is the nature and behavior of the Virtual IP for the VSX pair if clients are connected to the access switch using VSX as the default gateway?
- A. Virtual IP uses SVI IP address synced with VSX
- B. Virtual IP is active on both CX switches
- C. Virtual IP is active on the primary VSX switch
Virtual floating IP will failover in case of a failure
正解：C
解説：
Explanation
Virtual Switching Extension (VSX) is a feature that allows two Aruba CX switches to operate as a single logical device with a single control plane and data plane. VSX provides high availability, scalability, and simplified management for campus and data center networks3. In VSX, one switch is designated as the primary switch and the other as the secondary switch. The primary switch owns and responds to ARP Address Resolution Protocol. ARP is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address. This mapping is a critical function in the Internet protocol suite. requests for the virtual IP address of the VSX pair4. The virtual IP address is used as the default gateway for clients connected to the access switch. If the primary switch fails, the secondary switch takes over the virtual IP address and continues to forward traffic for the clients5.
References: 3
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/UG/Content/cx-ug/vsx/vsx-overview.htm 4
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/UG/Content/cx-ug/vsx/vsx-ip-addressing.htm 5
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/UG/Content/cx-ug/vsx/vsx-failover.htm
質問 # 18
When does the 802.1x authentication process begin when connecting to a secured enterprise mode WLAN?
- A. After the WPA 4-Way Handshake is completed
- B. After the captive portal authentication completes
- C. After the client completes 802.11 association
- D. After the firewall policies are applied to the session
正解：C
解説：
The 802.1x authentication process begins after the client device completes the 802.11 association with the access point but before the WPA 4-Way Handshake. This is part of the EAP (Extensible Authentication Protocol) process, which authenticates the device before allowing full network access.
質問 # 19
When using an Aruba standalone AP you select "Native VLAN" for the Client VLAN Assignment In which subnet will the client IPs reside?
- A. The same subnet as the mobility conductor
- B. The same subnet as the mobility controller
- C. The same subnet as the access point
- D. The same subnet as the Aruba ESP gateway
正解：C
解説：
When using an Aruba standalone AP, selecting "Native VLAN" for the Client VLAN Assignment means that the clients will get their IP addresses from the same subnet as the access point's IP address. This is because the access point acts as a DHCP server for the clients in this mode. Reference: https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instant-ug/iap-dhcp/iap-dhcp.htm
質問 # 20
What is an advantage of using Layer 2 MAC authentication?
- A. MAC allow lists are easily maintained over time
- B. MAC identifiers are hard to spoof
- C. it matches user names to MAC address
- D. No setup is required on the client
正解：D
解説：
Layer 2 MAC authentication is a method of authenticating devices based on their MAC addresses without requiring any client-side configuration or credentials. The switch sends the MAC address of the device to an authentication server such as ClearPass or RADIUS, which checks if the MAC address is authorized to access the network. If yes, the switch grants access to the device based on the assigned role and policies. If no, the switch denies access or redirects the device to a captive portal for further authentication. Reference: https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos-solutions/1-overview/mac-authentication.htm
質問 # 21
Please match the use case to the appropriate authentication technology
正解：
解説：
質問 # 22
What does WPA3-Personal use as the source to generate a different Pairwise Master Key (PMK) each time a station connects to the wireless network?
- A. Key Encryption Key (KEK)
- B. Session-specific information (MACs and nonces)
- C. Simultaneous Authentication of Equals (SAE)
- D. Opportunistic Wireless Encryption (OWE)
正解：B
解説：
Explanation
The source that WPA3-Personal uses to generate a different Pairwise Master Key (PMK) each time a station connects to the wireless network is session-specific information (MACs and nonces). WPA3-Personal uses Simultaneous Authentication of Equals (SAE) to replace PSK authentication in WPA2-Personal. SAE is a secure key establishment protocol that uses a Diffie-Hellman key exchange to derive a shared secret between two parties without revealing it to an eavesdropper. SAE involves the following steps:
The station and the access point exchange Commit messages that contain their MAC addresses and random numbers called nonces.
The station and the access point use their own passwords and the received MAC addresses and nonces to calculate a shared secret called SAE Password Element (PE).
The station and the access point use their own PE and the received MAC addresses and nonces to calculate a shared secret called SAE Key Seed (KS).
The station and the access point use their own KS and the received MAC addresses and nonces to calculate a shared secret called SAE Key Confirmation Key (KCK).
The station and the access point use their own KCK and the received MAC addresses and nonces to calculate a confirmation value called SAE Confirm.
The station and the access point exchange Confirm messages that contain their SAE Confirm values.
The station and the access point verify that the received SAE Confirm values match their own calculated values. If they match, the authentication is successful and the station and the access point have established a shared secret called SAE PMK.
The SAE PMK is different for each session because it depends on the MAC addresses and nonces that are exchanged in each authentication process. The SAE PMK is used as an input for the 4-way handshake that generates the Pairwise Temporal Key (PTK) for encrypting data frames.
The other options are not sources that WPA3-Personal uses to generate a different PMK each time a station connects to the wireless network because:
Opportunistic Wireless Encryption (OWE): OWE is a feature that provides encryption for open networks without requiring authentication or passwords. OWE uses a similar key establishment protocol as SAE, but it does not generate a PMK. Instead, it generates a Pairwise Secret (PS) that is used as an input for the 4-way handshake that generates the PTK.
Simultaneous Authentication of Equals (SAE): SAE is not a source, but a protocol that uses session-specific information as a source to generate a different PMK each time a station connects to the wireless network.
Key Encryption Key (KEK): KEK is not a source, but an output of the 4-way handshake that generates the PTK. KEK is used to encrypt group keys that are distributed by the access point.
References: https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-6e
https://www.wi-fi.org/file/wi-fi-alliance-unlicensed-spectrum-in-the-us
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/wpa3-dep-guide-og.ht
https://info.support.huawei.com/info-finder/encyclopedia/en/WPA3.html
https://rp.os3.nl/2019-2020/p99/presentation.pdf
質問 # 23
Refer to Exhibit.
Which server will receive the smallest quantity of data?
- A. 172.17.17.43
- B. 192.168.0.56
- C. 10.100.100.25
- D. 10.99.26.25
正解：A
解説：
Based on the exhibit showing the logging server configurations, server 172.17.17.43 will receive the smallest quantity of data because it is set to the "Warning" event log level. This means it will only log events that are categorized as warnings or higher severity, which are typically less frequent than lower severity levels such as "Information," "Debug," or "Emergency."
質問 # 24
You put in a few show commands on switches EDGE1 and CORE1 to attempt to gather information to troubleshoot the issue Use the show command output images to determine the reason for the EDGE1 uplink being down
- A. LACP is not configured on the Core uplink
- B. The Core is connected to the incorrect physical interlaces
- C. Spanning-Tree block state is preventing the Core uplink from having connectivity to the edge
- D. The physical interfaces are not members of the correct LAG.
正解：A
解説：
LACP is a protocol that allows multiple physical links to be aggregated into a single logical link for increased bandwidth and redundancy. LACP must be configured on both ends of the link for it to work properly. In this case, EDGE1 has LACP configured on its uplink port-channel 1, but CORE1 does not have LACP configured on its corresponding port-channel 1. This causes a mismatch and prevents the link from coming up. Reference: https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos-solutions/1-overview/lacp.htm
質問 # 25
Match the appropriate QoS concept with its definition.
正解：
解説：
質問 # 26
What change does a client make when it roams from one access point to another in a WLAN?
- A. It changes the destination MAC address on its 802.11 frames.
- B. It changes its default gateway to the IP of the new access point.
- C. It changes its association with the new wireless controller's SSID.
- D. It changes the SSID to match the SSID on the new access point.
正解：A
解説：
When a client roams from one access point to another, it must change the destination MAC address on its 802.11 frames to match the new access point to which it is associated. The SSID does not change since it is typically consistent across an entire WLAN, and the default gateway remains the same as long as the client stays within the same IP subnet. The association to a new access point involves updating the destination MAC address in the frames that the client sends.
質問 # 27
Which commands are used to set a default route to 10.4.5.1 on an Aruba CX switch when ln-band management using an SVl is being used?
- A. ip route 0.0 0 0/0 10.4.5.1
- B. ip route 0 0 0.070 10.4 5.1 vrf mgmt
- C. iP default-gateway 10.4.5.1
- D. default-gateway 10.4.5.1
正解：A
解説：
Explanation
The command that is used to set a default route to 10.4.5.1 on an Aruba CX switch when in-band management using an SVI is being used is ip route 0.0 0 0/0 10.4.5.1 . This command specifies the destination network address (0.0 0 0) and prefix length (/0) and the next-hop address (10.4.5.1) for reaching any network that is not directly connected to the switch. The default route applies to the default VRF Virtual Routing and Forwarding.
VRF is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time. VRFs are typically used to segment network traffic for security, privacy, or administrative purposes. , which is used for in-band management traffic that goes through an SVI Switch Virtual Interface.
SVI is a virtual interface on a switch that allows the switch to route packets between different VLANs on the same switch or different switches that are connected by a trunk link. An SVI is associated with a VLAN and has an IP address and subnet mask assigned to it
https://www.arubanetworks.com/techdocs/AOS-CX/10_08/HTML/ip_route_4100i-6000-6100-6200/Content/Ch
2
https://www.arubanetworks.com/techdocs/AOS-CX/10_08/HTML/ip_route_4100i-6000-6100-6200/Content/Ch
質問 # 28
A network administrator with existing IAP-315 access points is interested in Aruba Central and needs to know which license is required for specific features Please match the required license per feature (Matches may be used more than once.)
正解：
解説：
Explanation
a) Alerts on config changes via email - Foundation b) Group-based firmware compliance - Foundation c) Heat maps of deployed APs - Advanced d) Live upgrades of an AOS10 cluster - Advanced According to the Aruba Central Licensing Guide1, the Foundation License provides basic device management features such as configuration, monitoring, alerts, reports, firmware management, etc. The Advanced License provides additional features such as AI insights, WLAN services, NetConductor Fabric, heat maps, live upgrades, etc.
https://www.arubanetworks.com/techdocs/central/2.5.3/content/pdfs/licensing-guide.pdf
質問 # 29
What is the correct command to add a static route to a class-c-network 10.2.10.0 via a gateway of 172.16.1.1?
- A. ip route-static 10.2 10.0.255.255.255.0 172.16.1.1
- B. ip-route 10.2.10.0/24 172.16.1.1
- C. ip route 10.2.10.0/24.172.16.11
- D. ip route 10.2.10.0.255.255.255.0 172.16.1.1 description aruba
正解：B
解説：
The correct command to add a static route to a class-c-network 10.2.10.0 via a gateway of 172.16.1.1 is ip-route 10.2.10.0/24 172.16.1.1 . This command specifies the destination network address (10.2.10.0) and prefix length (/24) and the next-hop address (172.16.1 .1) for reaching that network from the switch. The other commands are either incorrect syntax or incorrect parameters for adding a static route. Reference: https://www.arubanetworks.com/techdocs/AOS-CX_10_04/NOSCG/Content/cx-noscg/ip-routing/static-routes.htm To add a static route in network devices, including Aruba switches, the correct command format generally includes the destination network, subnet mask (or CIDR notation for the mask), and the next-hop IP address. The command "ip route 10.2.10.0/24 172.16.1.1" correctly specifies the destination network "10.2.10.0" with a class C subnet mask indicated by "/24", and "172.16.1.1" as the next-hop IP address. This command is succinct and follows the standard syntax for adding a static route in many network operating systems, including ArubaOS-CX. The other options either have incorrect syntax or include additional unnecessary parameters that are not typically part of the standard command to add a static route.
質問 # 30
A network technician is testing a new SSID for a branch office. They are able to connect, get an IP address, and resolve DNS names. However, they are not able to browse the internet.
On the existing SSID at the branch, connectivity to the internet works as expected on the same VLAN as the new SSID. The wireless client should have received a new role to allow internet access.
What should the network technician verify to ensure both SSIDs function in a similar way?
- A. Verify the firewall policies assigned, making sure the rules are correct and ordered properly.
- B. Verify the new SSID is broadcasting on all the APs at the branch office.
- C. Verify each SSID's authentication and encryption parameters are enabled and the same.
- D. Verify that the implicit 'deny all' is the last entry in the firewall policies.
正解：A
解説：
When a network technician encounters an issue where a new SSID does not allow internet access despite successful connectivity and DNS resolution, they should verify the firewall policies associated with the new SSID. The firewall policies must include rules that permit traffic to and from the internet and should be correctly ordered to ensure that they are applied as intended. Since the existing SSID functions correctly, comparing the firewall rules between the two can be a useful method of troubleshooting.
質問 # 31
You are configuring a network with a stacked pair of 6300M switches used for distribution and layer 3 services. You create a new VLAN for users that will be used on multiple access stacks of CX6200 switches connected downstream of the distribution stack You will be creating multiple VLANs/subnets similar to this will be utilized in multiple access stacks What is the correct way to configure the routable interface for the subnet to be associated with this VLAN?
- A. Create a physically routed interface in the subnet on the 6300M stack for each downstream switch.
- B. Create an SVl in the subnet on the 6300M stack, and assign the management address of each downstream switch stack to a different IP address in the same subnet
- C. Create an SVl in the subnet on the 6300M stack.
- D. Create an SVl in the subnet on each downstream switch
正解：C
解説：
Explanation
The correct way to configure the routable interface for the subnet to be associated with this VLAN is to create an SVI Switched Virtual Interface (SVI) Switched Virtual Interface (SVI) is a virtual interface on a switch that represents a VLAN and provides Layer 3 routing functions for that VLAN . SVIs are used to enable inter-VLAN routing , provide gateway addresses for hosts in VLANs , apply ACLs or QoS policies to VLANs
, etc . SVIs have some advantages over physical routed interfaces such as saving interface ports , reducing cable costs , simplifying network design , etc . SVIs are usually numbered according to their VLAN IDs (e.g., vlan 10) and assigned IP addresses within the subnet of their VLANs . SVIs can be created and configured by using commands such as interface vlan , ip address , no shutdown , etc . SVIs can be verified by using commands such as show ip interface brief , show vlan , show ip route , etc . in the subnet on the 6300M stack.
An SVI is a virtual interface on a switch that represents a VLAN and provides Layer 3 routing functions for that VLAN. Creating an SVI in the subnet on the 6300M stack allows the switch to act as a gateway for the users in that VLAN and enable inter-VLAN routing between different subnets. Creating an SVI in the subnet on the 6300M stack also simplifies network design and management by reducing the number of physical interfaces and cables required for routing.
The other options are not correct ways to configure the routable interface for the subnet to be associated with this VLAN because:
Create a physically routed interface in the subnet on the 6300M stack for each downstream switch: This option is incorrect because creating a physically routedinterface in the subnet on the 6300M stack for each downstream switch would require using one physical port and cable per downstream switch, which would consume interface resources and increase cable costs. Creating a physically routed interface in the subnet on the 6300M stack for each downstream switch would also complicate network design and management by requiring separate routing configurations and policies for each interface.
Create an SVl in the subnet on each downstream switch: This option is incorrect because creating an SVI in the subnet on each downstream switch would not enable inter-VLAN routing between different subnets, as each downstream switch would act as a gateway for its own VLAN only. Creating an SVI in the subnet on each downstream switch would also create duplicate IP addresses in the same subnet, which would cause IP conflicts and routing errors.
Create an SVl in the subnet on the 6300M stack, and assign the management address of each downstream switch stack to a different IP address in the same subnet: This option is incorrect because creating an SVI in the subnet on the 6300M stack, and assigning the management address of each downstream switch stack to a different IP address in the same subnet would not enable inter-VLAN routing between different subnets, as each downstream switch would still act as a gateway for its own VLAN only. Creating an SVI in the subnet on the 6300M stack, and assigning the management address of each downstream switch stack to a different IP address in the same subnet would also create unnecessary IP addresses in the same subnet, which would waste IP space and complicate network management.
References: https://www.arubanetworks.com/techdocs/AOS-CX/10.05/HTML/5200-7295/index.html
https://www.arubanetworks.com/techdocs/AOS-CX/10.05/HTML/5200-7295/cx-noscg/l3-routing/l3-routing-ove
https://www.arubanetworks.com/techdocs/AOS-CX/10.05/HTML/5200-7295/cx-noscg/l3-routing/l3-routing-con
質問 # 32
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