Free HP HPE6-A85 Practice Exams

Question #1

After having configured the edge switch uplink as requested your colleague says that they have failed to ping the core You ask your colleague to verify the connection is plugged in and the switch is powered on They confirm that both are correct You attempt to ping the core switch and confirm that the ping is failing.

Knowing the nature of this deployment, what commands might you use to troubleshoot this issued

A . Ping 10.11 1 – ping the core to attempt to verify connectivity Show trunk – to verify if the LAG interface was correctly added to the switch Show spanning tree – to check for spanning-tree blocked states Show port-access clients interface all – to view any port-access blocking states or failed authentication attempts on all interfaces Show run interface vlan20 – to double check the layer 3 svi configuration is correct for l_3 connectivity Show lldp neighors – to verify whether you are able to see the Core as an L2 neighbor to verify if the correct links are plugged in to the correct ports
B . diagnostic diag cable-diag 1/1/51 diag cable-diag 1/1/52 – to view diagnostic information for the physical link to get a status on any interruptions to Layer 1 connectivity, show ip route – to verify that the default gateway is present in the routing table show ip ospf – to check whether there is a layer 3 routing protocol enabled show ip dns – to view whether there is a valid dns source
C . Ping 10.1.1.1 – ping the core to attempt to verify connectivity show lacp agg – to verify which link aggregations are currently configured using which physical ports show lacp int – to verify the LACP status and whether any links are blocking in your topology show lldp neighors – to verify whether you are able to see the Core as an L2 neighbor to verify if the correct links are plugged in to the correct ports show run interface 1/1/51.1/1/52-to ensure the physical interfaces are no-shut and members of the lag show run interface lag 1 – to ensure the correct vlan trunking configuration is applied to the logical interface show run int vlan 20 – to ensure you have the L3 SVI no shut and configured in the correct subnet
D . Show run – to view the running configuration of the switch Show run | begin 20 "vlan 20" – to ensure VLAN 20 was correctly added to the database show run | begin 20 ‘interface vlan 20’ – to view the L3 SVI configuration Show run interface 1/1/51.1/1/52 – to ensure the physical interfaces are no shut and were added as members of LAG 1 Show run int lag 1 – to verify LACP mode active was configured to eliminate LACP blocking states

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Question #2

The customer requires two Aruba CX 6200F 48G switches to be connected to each other with a distance of 80m/252ft between wiring closets. Switches need to have reservation for VSF expansion with ring topology in each cabinet.

What is a valid configuration for a redundant link-aggregation port configuration?

A . Ports 1/1/49 and 1/1/50 with SFP28 for LAG
B . Ports 1/1/47 and 1/1/48 for LAG
C . Ports 1/1/1 and 1/1/2 for LAG
D . Ports 1/1/51 and 1/1/52 with SFP+ for LAG

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Question #3

You need to drop excessive broadcast traffic on ingress to an ArubaOS-CX switch.

What is the best technology to use for this task?

A . Rate limiting
B . DWRR queuing
C . QoS shaping
D . Strict queuing

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Correct Answer: A
A

Explanation:

The best technology to use for dropping excessive broadcast traffic on ingress to an ArubaOS-CX switch is rate limiting. Rate limiting is a feature that allows network administrators to control the amount of traffic that enters or leaves a port or a VLAN on a switch by setting bandwidth thresholds or limits. Rate limiting can be used to prevent network congestion, improve network performance, enforce service level agreements(SLAs), or mitigate denial-of-service (DoS) attacks. Rate limiting can be applied to broadcast traffic on ingress to an ArubaOS-CX switch by using the storm-control command in interface configuration mode. This command allows network administrators to specify the percentage of bandwidth or packets per second that can be used by broadcast traffic on an ingress port. If the broadcast traffic exceeds the specified threshold, the switch will drop the excess packets.

The other options are not technologies for dropping excessive broadcast traffic on ingress because:

– DWRR queuing: DWRR stands for Deficit Weighted Round Robin, which is a queuing algorithm that assigns different weights or priorities to different traffic classes or queues on an egress port. DWRR ensures that each queue gets its fair share of bandwidth based on its weight while avoiding starvation of lower priority queues. DWRR does not drop excessive broadcast traffic on ingress, but rather schedules outgoing traffic on egress.

– QoS shaping: QoS stands for Quality of Service, which is a set of techniques that manage network resources and provide different levels of service to different types of traffic based on their requirements. QoS shaping is a technique that delays or buffers outgoing traffic on an egress port to match the available bandwidth or rate limit. QoS shaping does not drop excessive broadcast traffic on ingress, but rather smooths outgoing traffic on egress.

– Strict queuing: Strict queuing is another queuing algorithm that assigns different priorities to different traffic classes or queues on an egress port. Strict queuing ensures that higher priority queues are always served before lower priority queues regardless of their bandwidth requirements or weights. Strict queuing does not drop excessive broadcast traffic on ingress, but rather schedules outgoing traffic on egress.

References:

https://en.wikipedia.org/wiki/Rate_limiting

https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/storm-control .htm

https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/dwrr.htm

https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/shaping.htm

https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/strict.htm

Question #4

What command is used to add a static route to a network 192.168.10.0/24 via gateway 192.168.1.1 on an Aruba router?

A . ip route 192.168.10.0 255.255.255.0 192.168.1.1
B . route add -net 192.168.10.0 netmask 255.255.255.0 gw 192.168.1.1
C . ip route 192.168.10.0/24 192.168.1.1
D . add route 192.168.10.0/24 via 192.168.1.1

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Question #5

How does the Aruba Mobility Controller handle Layer 3 mobility in a campus network?

A . By assigning a unique IP subnet to each wireless client.
B . Through a centralized database that tracks the location and movement of users.
C . By maintaining a tunnel to each access point for seamless user transitions.
D . Mobility does not require any special handling at Layer 3.

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Question #6

What is an advantage of using Layer 2 MAC authentication?

A . MAC allow lists are easily maintained over time.
B . No setup is required on the client.
C . It matches user names to MAC address.
D . MAC identifiers are hard to spoof.

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Question #7

Which Protocol Data Unit (PDU) represents the network layer PDU?

A . PDU3 – Packet
B . PDU4 – Segment
C . PDU1 – Signal
D . PDU2 – Frame

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Question #8

You need to troubleshoot an Aruba CX 6300F switch that fails to boot correctly. Select the option that allows you to access the switch and see the boot options available for OS images and ServiceOS.

A . USB-C console port
B . RJ-45 console port
C . USB-A console port
D . Omgmt port using SSH

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Question #9

When measuring signal strength, dBm is commonly used and 0 dBm corresponds to 1 mW power.

What does -20 dBm correspond to?

A . .-1 mW
B . .01 mw
C . 10 mW
D . 1mW

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Question #10

What is the ideal Aruba access switch for a cost-effective connection to 200-380 clients, printers and APs per distribution rack?

A . Aruba CX 6400
B . Aruba CX 6200
C . Aruba CX 6300
D . Aruba CX 6000

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Correct Answer: C
C

Explanation:

The ideal Aruba access switch for a cost-effective connection to 200-380 clients, printers and APs per distribution rack is the Aruba CX 6200. This switch series is a cloud-manageable, stackable access switch series that is ideal for enterprise branch offices and campus networks, as well as SMBs.

The CX 6200 series offers the following benefits:

– Enterprise-class connectivity: The CX 6200 series supports ACLs, robust QoS, and common protocols such as static and Access OSPF routing.

– Power and speed for users and IoT: The CX 6200 series provides built-in 1/10GbE uplinks and 30W to 60W of Class 4 to Class 6 PoE for powering devices such as APs and cameras.

– Scalable growth made simple: The CX 6200 series supports Aruba Virtual Switching Framework (VSF) that allows you to quickly grow your network to eight members in a single stack using high-performance built-in 10G SFP ports.

– Management flexibility: The CX 6200 series supports a choice of management, including cloud-based and on-prem Central, CLI, switch Web GUI and programmability with AOS-CX operating system, and REST APIs.

The other options are not ideal because:

– Aruba CX 6400: This switch series is a high-availability modular switch series that is ideal for versatile edge access to data center deployments. It offers more performance, scalability, and modularity than the CX 6200 series, but it is also more expensive and complex to deploy and manage. It may not be cost-effective for connecting 200-380 clients per distribution rack.

– Aruba CX 6300: This switch series is a layer 3 stackable access and aggregation switch series that offers Smart Rate and High Power PoE. It offers more features and performance than the CX 6200 series, but it is also more expensive and may not be necessary for connecting 200-380 clients per distribution rack.

– Aruba CX 6000: This switch series is a layer 2 access switch series that offers PoE. It offers less features and performance than the CX 6200 series, and it does not support VSF stacking or routing protocols. It may not be sufficient for connecting 200-380 clients per distribution rack.

References:

https://www.arubanetworks.com/products/switches/access/

https://www.arubanetworks.com/products/switches/access/6200-series/

https://www.arubanetworks.com/products/switches/access/6400-series/

https://www.arubanetworks.com/products/switches/access/6300-series/

https://www.arubanetworks.com/products/switches/access/6000-series/