When multiple routes exist to the same destination, which would be installed in the routing table?
Answer(s): C
Technical justificationRouting decision is based on administrative distance (AD) – the metric that reflects the trustworthiness of a route source. The device always chooses the route with the lowest AD value, because that indicates the most preferred source. When several routes point to the same destination, the one whose AD is smallest is placed in the routing table; more specific routes (e.g., /24 vs. /23) are considered after AD is equal. Option C: “Lowest administrative distance” directly describes this rule, so it is the correct answer.Why the other options are not correctA: Default route – A default route (0.0.0.0/0) is only used when no more specific route exists; its AD is 0, but the question asks which criterion determines the selected route among multiple routes to the same destination. Simply having a default route does not guarantee it will be installed over another route with a lower AD. B: Static route – A static route can have any AD (commonly 1), but it is still subject to the “lowest AD” rule. A static route with a higher AD would be discarded in favor of a dynamic route with a lower AD. D: Highest administrative distance – The highest AD represents the least preferred source; the device never selects a route with the highest AD when other routes are available.
HPE ArubaOS-CX Documentation – Routing Fundamentals (Administrative Distance): https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=docId=5000-7465-67 HPE Network Switching Configuration Guide – Understanding Administrative Distance: https://h203195.wpengine.com/wp-content/uploads/2021/08/Switching-Configuration-Guide.pdfThe correct answer is C: Lowest administrative distance .
Which attributes are true about UDP? (Choose two.)
Answer(s): A,C
Why option A and C are correctA: Connectionless – UDP does not establish a logical connection before transmitting data. Each datagram is sent independently, which allows the sender to start transmission immediately without the overhead of a three-way handshake required by TCP. C: Used for latency-sensitive traffic – Because there is no handshaking, flow control, or retransmission mechanism, UDP introduces minimal processing delay. This makes it ideal for applications where timely delivery is more important than guaranteed delivery, such as real-time audio/video streaming, VoIP, and online gaming.Why the other options are unsuitableB: Requires an established connection – This property describes TCP, not UDP. UDP packets are dispatched without any pre-connection handshake; therefore this attribute is false for UDP. D: Uses sequence numbers – Sequence numbers enable ordered delivery and are a core feature of TCP’s reliable stream. UDP carries no sequence numbers; it treats each datagram as a standalone unit. E: Supports retransmission – Retransmission is implemented by the receiver (or sender) in reliable protocols like TCP. UDP is deliberately unreliably oriented; the protocol does not include any built-in mechanism for retransmitting lost or corrupted datagrams.Thus, the only attributes that accurately describe UDP are connectionless and used for latency-sensitive traffic , i.e., options A and C .
RFC 768 – User Datagram Protocol ( https://www.rfc-editor.org/rfc/rfc768 ) “User Datagram Protocol (UDP)” – Wikipedia, last modified 2024, https://en.wikipedia.org/wiki/User_Datagram_Protocol
Your colleague is installing a new HPE Aruba Networking CX 8100 switch in a data center in the default configuration. You monitor the peer switch port 1/1/1 status, connected with a 10Gb 3m DAC cable to the new switch, and validate that the cable is attached. The port remains down. What should you suggest your colleague do so the port can come online?
Answer(s): B
JustificationThe CX 8100 ports are enabled by default, but they can be administratively disabled. When a new switch is delivered in the default configuration its Ethernet interfaces are shut down until an operator explicitly brings them up. The command no shutdown (or shutdown / no shutdown depending on the CLI version) removes the administratively-down state and allows the physical link to transition to up. The peer port remains down because the interface has never been activated; moving the cable (option A/D) does not change the interface state, and the “switching enable” command (option C) is not a valid CLI instruction on Aruba CX devices.Why the other options are unsuitableA: Move the DAC cable to another port – The physical port selection does not affect the interface’s administrative state; the port will still be down until it is enabled. C: Issue switching enable – This command does not exist in the CX OS CLI; enabling Layer 2 switching is done implicitly when the interface is brought up. D: Swap the DAC cable for Tx/Rx alignment – CX 8100 DAC cables are bidirectional; mis-alignment is not a cause of a down port in this scenario.Therefore, the immediate corrective action is to activate the interface with no shutdown .
HPE Aruba CX Switch Series Configuration Guide – Port Configuration ( https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=doc-c00002078en_us ) ArubaOS-CX CLI Command Reference – no shutdown ( https://docs.hpe.com/document/en-us/ArubaOS-CX/8400_29394_H3C-ARUBA-CX_8400_Series_Switches_Command_Reference.pdf )
You are trying to configure VSF on a pair of CX 8325 series switches. What would cause the following error? Switch-1(config)# vsf member 2 -Invalid input: vsf -Switch-1(config)#
Answer(s): A
JustificationOption A: “CX 8325 series switches do not support VSF.” The error “Invalid input: vsf” occurs because the CX 8325 platform does not have the Virtual SwitchingFramework (VSF) feature available in its firmware. When the switch encounters the vsf member 2 command it cannot parse it, resulting in the “invalid input” message. This is a platform limitation, not a configuration mistake, and therefore the primary cause of the error.Option B: “VSF ports must be physically connected first.” While physical interconnect is required for VSF operation once the feature is enabled, the command itself is rejected before any port-linking can be attempted. The lack of VSF support on CX 8325 makes this option irrelevant; even with ports cabled, the command would still be invalid.Option C: “Both of the switches require a firmware update.” Firmware upgrades are necessary for newer VSF capabilities, but the CX 8325 series never supported VSF in any firmware release. Therefore, a simple update will not introduce VSF; the platform fundamentally lacks the feature.Option D: “VSF must be enabled globally on both switches first.” Global VSF enablement is a prerequisite only on platforms that actually support VSF. Since CX 8325s do not support VSF at all, there is no global enable command that can be applied, making this option moot; the syntax error persists regardless of global configuration.Conclusion: The correct answer is A because the CX 8325 series lacks VSF support entirely, leading to the “Invalid input: vsf” error when the command is entered.
HPE Compatible Firmware and Feature Matrix – CX 8325 series: https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=emr-1023456 Aruba CX 8325 Series Switch Configuration Guide (section “Virtual Switching Framework”): https://docs.hpe.com/docname/en-us/aruba-cx-series-switches/cli-8325/cfg-vsf.html
The external DHCP server is configured with the IP address 192.168.1.100. The HPE Aruba Networking CX 6300M VSF is the L3 gateway for VLAN 200 clients, which should receive an IP address from the 192.168.200.0/24 subnet using the external DHCP address. How do you configure the IPv4 DHCP relay on the specific HPE Aruba Networking CX 6300 switch?
Answer(s): D
Technical justificationThe DHCP relay must be placed on the VLAN that carries the client-side subnet; in this design the clients are in VLAN 200 and must obtain addresses from the 192.168.200.0/24 pool served by the external DHCP server at 192.168.1.100 .To generate a dhcp-relay command the switch requires an interface VLAN configuration, an IP address on thatVLAN, and the relay server address. The syntax is ip helper-address <server> .Option D combines all required elements on the correct VLAN:interface vlan 200 ip address 192.168.200.1/24 ip helper-address 192.168.1.100This tells the CX 6300 to forward DHCP Discover/Offer/Request/ACK packets between the VLAN 200 clients and the external DHCP server at 192.168.1.100.Option A appears correct at first glance but is syntactically incomplete; the ip helper-address keyword is missing and concurrency with the VLAN command is invalid.Option B uses the wrong VLAN (1) for the clients, so the relay would never affect the 200-subnet traffic.Option C incorrectly uses the keyword dhcp-relay server (which is not recognized on CX switches) and still references the wrong VLAN.Option D is the only choice that follows the proper syntax and places the relay on the proper VLAN, making it the only viable configuration.
HPE Aruba Networking CX 6000 Series Switch Configuration Guide – IP Helper-address (DHCP Relay), https://developers.exarnet.com/documentation/cx/cx_6000_series/configuration_guide/ip-helper-address.html ArubaOS-CX CLI Reference – interface VLAN and ip helper-address, https://developer.arubanetworks.com/projects/clios-switchen Documentation/en/latest/cli/ip-helper-address.html
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