HP HP2-Z31 Online Practice Questions and Exam Preparation

HP HP2-Z31 Online Questions & Answers

• Question 1:

  How does an HP Provision OpenFlow device treat packets received on a port blocked by Spanning Tree Protocol?

  A. Packets are submitted to the OpenFlow pipeline for processing.
  B. Packets are not submitted to the OpenFlow pipeline for processing.
  C. BPDU frames are submitted to The OpenFlow pipeline for processing.
  D. All Layer 2 frames are submitted to the controller for processing
  A. Packets are submitted to the OpenFlow pipeline for processing.

  ---

  explanation:

  *

  Can STP and OpenFlow be used together?

  No. They are mutually exclusive. On a Hybrid switch STP is turned off on the OpenFlow VLAN. A recommendation is to enable STP on non-OpenFlow VLANs, but disable on the OpenFlow VLANs. This is safer than disabling STP globally on

  the switch.

  *

  Do not allow a loop between the OpenFlow and non-OpenFlow portions of your network unless you enable Spanning Tree Protocol on the non OpenFlow devices operating in the network.

  *

  There are two types of OpenFlow switches:

  

  OpenFlow-only

  

  OpenFlow-hybrid

  OpenFlow only switches support only OpenFlow operation. All packets are processed using OpenFlow. There is no other way to process packets. OpenFlow hybrid switches support both OpenFlow operation and normal Ethernet switching operation.

• Question 2:

  Refer to the exhibit.

  

  Which HP VAN SDN Controller feature displays the output in the exhibit?

  A. Audit Log
  B. OpenFlow Monitor
  C. Support Log
  D. Alerts
  A. Audit Log

  ---

  explanation:

  For example, the audit log displays software license and teaming activity:

  

  Reference: HP VAN SDN Controller Administrator Guide

• Question 3:

  A company has video, voice, and collaboration applications. The company is looking for a solution that improves performance. Which benefit does software-defined networking (SDN) provide tor this company?

  A. SDN establishes a loop-free, non-baking architecture using Transparent interconnection of Lots of Links (TRILL) or Shortest Path Bridging (SPF3), as the company chooses.
  B. SDN applications can automate the scripting of CLI commands- that adjust QoS policies as necessary
  C. SDN applications can determine which traffic flows require prioritization and then program the infrastructure to prioritize these flows.
  D. SDN adds three additional priority classes, specific to voice, video and collaboration, in addition to the eight classes provided by traditional QoS mechanisms.
  C. SDN applications can determine which traffic flows require prioritization and then program the infrastructure to prioritize these flows.

  ---

  explanation:

  Unified Communications and Collaboration (UCandC) SDN Application--This application aims to improve the user experience of products such as Microsoft Lync within campus networks. It automates the deployment of quality-of-service policies and dynamically adjusts network priorities to securely support voice, video, and collaboration traffic, even in an environment integrating soft phones and BYOD user endpoints.

  Reference: HP Virtual Application Networks SDN Controller

• Question 4:

  Which Open Flow plane is responsible for forwarding the packets?

  A. Control plane
  B. Application plane
  C. Management plane
  D. Data plane
  D. Data plane

  ---

  explanation:

  The forwarding table is delivered to the data plane by the management plane as part of the device operating system. Thus when an Ethernet frame arrives on the switch interface, the data plane then forwards it to output port.

  Note: OpenFlow defines a standard for sending flow rules to network devices so that the Control Plane can add them to the forwarding table for the Data Plane.

  Incorrect:

  Not A: The control plane will use the routing table to build the forwarding table used by data plane. Not C: The Management Plane handles functions such device management, firmware updates, SNMP and external configuration via the CLI.

  Reference: OpenFlow and Software Defined Networking: Is it Routing or Switching ?

• Question 5:

  Refer to the exhibit.

  

  A team of HP VAN SDN Controllers has been configured. In addition, regions have been configured. The switch shown in the exhibit has two OpenFlow sessions as follows:

  Controller1 - Master Controller2 - Slave

  Controller1 is rebooted What happens?

  A. The role orchestration service detects Controller1 failure, and Controller2 becomes the master. Once Controller1 rejoins the team, it becomes the master, and Controller2 reverts to being the slave.
  B. The role orchestration service detects Controller1 failure, and Controlle2 becomes the master. Once Controller1 rejoins the team, it joins as the slave controller.
  C. The role orchestration service detects Controller1 failure. Controller2 becomes the master, and Controller1 becomes the slave. Once Controller1 rejoins the team. It joins as the master and Controller2 becomes the slave.
  D. The role orchestration service detects Controller1 failure. Controller2 becomes the master and Controller1 becomes the slave. Once Controller1 rejoins the team it no longer communicates with the switch.
  A. The role orchestration service detects Controller1 failure, and Controller2 becomes the master. Once Controller1 rejoins the team, it becomes the master, and Controller2 reverts to being the slave.

  ---

  explanation:

  *

  Failover (step 1)

  ROS (role orchestration service) triggers the failover operation in two cases:

  / Controller failure:

  / Device disconnect:

  The ROS instance in a controller is notified of a communication failure with network device(s) through the Controller Service notifications. It instantly communicates with all ROS instances in the team to determine if the network device(s) in

  question are still connected to any of the backup (slave) controllers within the team. If that is the case, it elects one of the slaves to assume the master role over the affected network device(s).

  *

  Failback (step 2)

  When the configured master recovers from a failure and rejoins the team, or when the connection from the disconnected device(s) with the original master is resumed, ROS initiates a failback operation in which the master role is restored to

  the configured master as defined in the region definition.

  Reference: HP VAN SDN Controller Administrator Guide

• Question 6:

  Which switches will initiate an QpenFlow connection to the HP VAN SDN Controller? (Select two.)

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  E. Option E
  C. Option C
  E. Option E

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  explanation:

  You must enable openflow.

  Enable/disable Openflow:

  openflow {enable/disable}

  Note:

  Openflow Configuration (required)

  Once you've set up a VLAN, you need to enable and configure an OpenFlow instance on that VLAN.

  Show the set of configured OpenFlow instances:

  show openflow

  Enter the VLAN for the instance you'd like to configure:

  vlan

  Show the Openflow configuration, including configurable state, controller connectivity, and switch MAC addr:

  show openflow

  Set the controller string (6633 is NOX's default port):

  openflow controller tcp:: Enable/disable Openflow:

  openflow {enable/disable}

  Reference: Configuring HP Procurve

  http://archive.openflow.org/wk/index.php/Configuring_HP_Procurve

• Question 7:

  Which services does HP IMC SDN Manager provide? (Select two.)

  A. Managing switch listeners
  B. Updating Topology Service discovery protocol
  C. Managing OpenFlow enabled SDN resources
  D. Creating and maintaining flow policies
  E. Managing and maintaining application awareness
  C. Managing OpenFlow enabled SDN resources
  D. Creating and maintaining flow policies

  ---

  explanation:

  *

  HP VAN SDN Manager provides the following:

  / Consistent management experience across SDN and traditional networks / Configuration, monitoring, and policy management for a software-defined network / OpenFlow switch management for quick troubleshooting and deployment

  *

  SDN management

  HP Provides a complete SDN management solution that:

  / Delivers network agility through rapid provisioning and automation of network policy enforcement and enabling SDN deployments.

  / Accelerates application deployment through rapid provisioning of server connectivity. / Enables service agility and velocity from access to core through network resource provisioning. / Provides comprehensive management of all SDN

  layers.

  Reference: Mock RFI for Enterprise SDN Solutions

• Question 8:

  Which HP IMC SDN Manager functionally provides a detailed overview of flow entry history?

  A. SDN Manager service flow management
  B. SDN Manager Open Flow device management
  C. SDN Manager dashboard
  D. SDN Manager flow entry management
  A. SDN Manager service flow management

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  explanation:

  Flow Management:

  *

  Delivers History Flow Entry records flow entry used before to help administrators audit flow policy change

  *

  Displays the list of all current Flow entry in OF network, including Match Field, Instruction and other statistics.

  *

  Shows detailed flow service information and flow traffic and trend in flow entry detail page

  *

  Provides shortcut to locate flow to topology show device and link status Reference: HP IMC Virtual Application Networks Software-defined Networking Manager Software

• Question 9:

  Refer to the exhibit.

  

  The topology shown in the exhibit has the following characteristics:

  *

  The Open Flow enabled switches are running in virtualization mode with member VLAN 10

  *

  All the switches in the topology share the same VLANs.

  *

  All the VLANs are tagged on all the links.

  *

  Each OpenFlow domain is controlled by its own controller and is making independent decisions

  *

  Every switch within the topology has PVST enabled only on VLAN 10

  The networking team implementing OpenFlow reports that there are communication problems between the OpenFlow domains. What could be the cause of this communication problem?

  A. This is an unsupported topology.
  B. OpenFlow requires a dedicated out-of-band management network
  C. OpenFlow networks that communicate must use different VLANs.
  D. A loop has been formed.
  A. This is an unsupported topology.

  ---

  explanation:

  Virtualization mode With Virtualization Mode, some VLANs can be designated as members of OpenFlow instances. Each OpenFlow instance is independent and has its own OpenFlow configuratio

  Note: OpenFlow can be configured for Virtualization Mode or Aggregation Mode.

  *

  Virtualization Mode Each OpenFlow instance is independent and has its own OpenFlow configuration and OpenFlow controller connection. Some VLANs are designated as members of OpenFlow instances while other VLANs are not. The VLANs that are not members of OpenFlow instances could be thought of as VLANs carrying production traffic.

  *

  Aggregation Mode Provides a single OpenFlow instance that includes all of the VLANs configured on the switch except the VLAN(s) that connect to the controller(s) and the Management VLAN on the switch. Production traffic is not allowed

  Reference: HP OpenFlow Switches Administrator's Guide

• Question 10:

  Which protocol is used for link discovery when OpenFlow switches are separated by a non- OpenFlow switch?

  A. BDDP
  B. RSTP
  C. LLDP
  D. LACP
  A. BDDP

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  explanation:

  LLDP is used to discover direct links between switches and BDDP is used to discover the switches in the same broadcast domain.

  Note: Using a link-discovery module, the controller generates both LLDP and broadcast packets (referred to as BDDPs) and sends them to all neighboring switches on a regular basis.

  Reference: OpenFlow Controller