HP HP2-Z31 Online Practice Questions and Exam Preparation

HP HP2-Z31 Online Questions & Answers

• Question 21:

  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.

  ---

  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 22:

  An SDN developer wants to develop a new OpenFlow proactive application using the HP VAN SDN Controller. The controller is configured with IP address 192.168.56.7 and is using release 2.0. The developer is unsure of the REST APIs available on the controller.

  To which URL should you recommend the developer navigate?

  A. https://192.168.56.7:8443/api
  B. https://192.168.56.7:8443/sdn/ui
  C. http://192.168.56.7:8443/api
  D. http://192.168.56.7:8443/sdn/ui
  A. https://192.168.56.7:8443/api

  ---

  {base uri}/{api}

  This is an unauthenticated API

  Use https not http.

  Example:

  https://15.255.121.2:8443/api

  Response codes

  ?Normal: OK (200)

  ?Error: Not Found (404), Service Unavailable (503) Reference: HP VAN SDN Controller 2.2 REST AP

• Question 23:

  What are examples of information that the Topology Service returns for an OpenFlow switch port? (Select two.)

  A. Whether the port is a connection point
  B. Whether the port can be used as an observation point
  C. Whether the port has BDDP enabled
  D. Whether the port has LLDP medium endpoint discovery enabled
  E. Whether the port can participate in forwarding mode in a looped topology
  A. Whether the port is a connection point
  E. Whether the port can participate in forwarding mode in a looped topology

• Question 24:

  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.

  ---

  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 25:

  What is one benefit of a software-defined networking (SDN) solution for a WAN?

  A. SDN applications can automatically deploy key services on branch zl or MSR modules in case of a failed WAN connection.
  B. SDN applications provide a remote connection to servers so that remote IT staff can identify and resolve issues.
  C. SDN applications provide a graphical interface for scripting CLI commands for multiple branches at once.
  D. SDN applications can adjust WAN bandwidth provisioning granularly, dynamically, and intelligently.
  D. SDN applications can adjust WAN bandwidth provisioning granularly, dynamically, and intelligently.

  ---

  Software-defined networking (SDN) is an architecture purporting to be dynamic, manageable, cost- effective, and adaptable, seeking to be suitable for the high-bandwidth, dynamic nature of today's applications.

  The SDN architecture is:

  Directly programmable: Network control is directly programmable because it is decoupled from forwarding functions.

  Agile: Abstracting control from forwarding lets administrators dynamically adjust network-wide traffic flow to meet changing needs.

  Reference: Wikipedia, Software-defined networking

• Question 26:

  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

  ---

  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 27:

  Which service on the HP VAN SDN Controller allows Observation posts to be set on a network?

  A. Network Node Service
  B. Path Diagnostic Service
  C. Path Daemon Service
  D. Topology Service
  B. Path Diagnostic Service

  ---

  Path Diagnostics Determines and verifies the path taken by a specific packet from a source host to destination host. Evaluates flows configured across the switches in the control domain for diagnosis Creates `Observation posts' on every switch in the path that the packet would take Tallys packet_ins from the observation posts to figure out where a path is broken Lists neighbors for any given device

  Reference: HP VAN SDN Controller Administrator Guide

• Question 28:

  A switch connects to the HP VAN SDN Controller, which has the HP Network Protector SDN Application installed. These are the switch details:

  Switch: 3800-24G-2XG Firmware: KA15.14.003 OpenFlow negotiated: 1.3

  Which channel will be used for communication with the HP Network Protector application?

  A. OpenFlow Channel
  B. Normal Forwarding
  C. Service Insertion Tunnel
  D. GRE Tunnel
  A. OpenFlow Channel

  ---

  The application uses the switch firmware information to decide if the communication with the switch is through OpenFlow channel or through the application Insertion tunnel. For firmware versions K.15.14 and lower, the application communicates with the switch through OpenFlow channel. For firmware versions KA.15.15.0015 and greater, the application can communicate with the switch either through OpenFlow channel or Service Insertion tunnels.

  Reference: HP Network Protector SDN Application Administrator Guide

• Question 29:

  Which HP VAN SDN Controller service processes ARP replies in Packetin messages sent by the OpenFlow switches?

  A. Controller Service
  B. Path Daemon
  C. Path Diagnostics Service
  D. Node Manager
  D. Node Manager

  ---

  Node Manager

  Operation:

  Learns and maintains end-host locations in the network. Uses information received from network devices to maintain the ARP table and end host data.

  Uses the Topology Service to determine if a port receiving a packet is an edge port or not. Learns and maintains end nodes in the controller domain, and associates end nodes with edge ports. Builds an ARP cache with MAC-IP translations

  of end hosts.

  Maintains ARPs on a per-VID basis.

  Provides the edge port details for end hosts.

  Reference: HP VAN SDN Controller Administrator Guide

• Question 30:

  Refer to the exhibit.

  

  A network administrator is trying to install a new internal application on the HP VAN SDN Controller and receives the error shown in the exhibit. Which valid options are available to ensure that the application is installed successfully? (Select two.)

  A. Set up an internal CA server and digitally sign the application. This will be accepted by the HP VAN SDN Controller without further configuration.
  B. Use the HP VAN SDN Controller software to digitally sign the application
  C. Modify the /opt/sdn/virgo/configuration/serviceability .xml configuration file and include this line: Dsdn signedJar=none
  D. Modify the /opt/sdn/virgo/bin'dmk sh script and include this line: Dsdn.signedJar=none
  E. Ensure the application is signed by a CA recognized by the HP VAN SDN Controller.
  B. Use the HP VAN SDN Controller software to digitally sign the application
  D. Modify the /opt/sdn/virgo/bin'dmk sh script and include this line: Dsdn.signedJar=none

  ---

  D_ The SDN controller enforces jar-signing validation by default. For an experimental/development environment where unsigned applications need to be deployed, jar- signing validation can be turned off altogether:

  Stop the SDN controller: sudo service sdnc stop

  2.

  Modify the /opt/sdn/virgo/bin/dmk.sh script to include the line "-Dsdn.signedJar=none \"

  3.

  Start the SDN controller:

  sudo service sdnc start

  B: Adding Certificates to Jar-Signing Truststore

  To deploy other signed applications onto the controller, use the Java keytool to import the public certificate that was used to sign the application jars into the controller jar-signing truststore (/opt/sdn/admin/ sdnjar_trust.jks):

  keytool -importcert -keystore /opt/sdn/admin/sdnjar_trust.jks -file signed_app.cer -alias mysignedcert The controller needs to be restarted for the new truststore to take effect.

  Reference: HP VAN SDN Controller Administrator Guide