HP HP2-Z31 Online Practice Questions and Exam Preparation

HP HP2-Z31 Online Questions & Answers

• Question 61:

  Refer to the exhibit.

  

  A network engineer wants to use dpctl to make flow modifications directly on an HP 3800 switch flow table. Can the engineer make the changes using dpctl on the switch in the exhibit?

  A. The engineer is unable to connect to the switch directly. Dpctl requires OpenFlow 1.0, and (he switch is currently configured to use OpenFlow 1.3.
  B. The engineer is able to connect to the switch directly using dpctl, but is unable to use dpctl to update the flow entries on the switch. Ovs-ofctl is required to make flow modifications when using OpenFlow 1.3.
  C. The engineer is able to connect to the switch directly using dpctl. The engineer will then need to use the correct OpenFlow 1 3 syntax to make flow modifications using dpctl.
  D. The engineer is unable to connect to the switch directly. Once the correct configuration is completed on the switch, the engineer will be able to connect directly and then use the correct OpenFlow 1.3 syntax to make flow modifications using dpctl
  C. The engineer is able to connect to the switch directly using dpctl. The engineer will then need to use the correct OpenFlow 1 3 syntax to make flow modifications using dpctl.

  ---

  dpctl

  The HP supports a passive listening port per OpenFlow instance. This is super-useful when you want to debug an individual switch without going through the controller.

  Add a listener port:

  openflow listener ptcp:6633

  Then use dpctl. Examples:

  dpctl dump-tables tcp::

  dpctl dump-flows tcp::

  dpctl add-flow tcp:: 'in_port=104 actions=output:98'

• Question 62:

  A company has an IRF-based, 2-tier FlexFabric architecture in its data center. The company is now increasing the amount of server virtualization and also adding more redundant connections across the network infrastructure backbone. Which benefit does software-defined networking (SDN) provide for this FlexFabric solution?

  A. SDN applications can extend the virtual switches inside hosts into the control plane of multiple physical infrastructure devices.
  B. SDN can help core routing switches handle more routing table entries without sacrificing performance.
  C. SDN extends the SNMP MIBs to include MIBs for virtual switches.
  D. SDN applications can help to provision network connectivity for virtual machines and to forward traffic across complex meshes of links
  A. SDN applications can extend the virtual switches inside hosts into the control plane of multiple physical infrastructure devices.

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  Q: What is HP's SDN strategy?

  A: Virtual Application Networks represent HP's software-defined network vision. By leveraging SDN- enabled infrastructure, control plane, applications and integrated management systems HP is creating an open ecosystem to drive new innovation in networking.

  Q: What is the HP Virtual Application Networks SDN Controller?

  A: The HP Virtual Application Networks SDN controller is an integral part of HP's Virtual Application Networks offering. The controller acts as the central building block for an abstracted control plane in the SDN architecture.

  Reference: Virtual Application Networks Overview http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA4-4714ENW.pdf? jumpid=em_r1165_ww/en/large/eg/ RelatedLink/Virtual_Application_Networks_Overview_FAQs/resourc efinder/Jan_2013

• Question 63:

  Which technology can be used in OpenFlow 1.3 that allows rate limiting of packets that are sent to the SDN Controller?

  A. Slicing
  B. sFlow support
  C. Meter on IP ToS/DSCP bits
  D. Meter table
  D. Meter table

  ---

  Per-flow meters OpenFlow 1.3 brings support for per-flow meters. These can be attached to flow entries and can measure and control the rate of packets. One of the main applications of perflow meters is to rate limit packets sent to the controller.

  Reference: Production-ready SDN with OpenFlow 1.3 http://h17007.www1.hp.com/docs/interop/2013/37958_HPN_SDN_Openflow_Brief_042913_lo.pdf (page 2)

• Question 64:

  A customer wants to deploy an HP ProVision-based network with laptops daisy chained to physical IP phones. The customer also wants the laptop traffic to be managed by OpenFlow, while the phones use traditional QoS. Which OpenFlow switch instance configuration option should the customer use?

  A. QoS passthrough
  B. Aggregate
  C. Virtualization
  D. Passive
  C. Virtualization

• Question 65:

  Why would an architect require an application to be written as an internal application rather than as an external application?

  A. lower cost of development
  B. faster event-driven responses
  C. greater flexibility of platform choices
  D. increased program language options
  B. faster event-driven responses

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  HP SDN Controller Internal Applications and Modules There are two main ways applications interact with the controller:

  

  Within the controller using native applications or modules (Java based or byte compatible applications such as Scala).

  

  Outside the controller using web based applications (using RESTful APIs).

  Application Types:

  

  Native Applications / Modules - This is the ideal model for applications that need to exert relatively finegrained,

  

  frequent and low-latency control interactions with the environment, e.g. handling packet-in events, etc.

  

  Web Based applications - Suitable for applications that need to exert "business" level, i.e. relatively coarsegrained,infrequent and high-latency control interactions with the environment, e.g. path provisioning, flow inspections, etc.

  Reference: HP SDN Controller Architecture, Technical Solution Guide

• Question 66:

  Which HP IMC SDN Manager functionality provides a detailed overview of OpenFlow counters and DPIDs?

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

  ---

  OpenFlow device management Displays all the flow entries, counters, DPIDs, and other OpenFlow statistics per device Helps locate OpenFlow devices within the network topology Reference: HP IMC Virtual Application Networks Software-defined Networking Manager Software (page 2) http://www8.hp.com/h20195/v2/GetPDF.aspx%2F4AA4-9879ENN.pdf

• Question 67:

  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

  ---

  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

• Question 68:

  Which command installs the HP VAN SDN Controller software?

  A. sudo dpkg -1 *hp-sdn-ctl
  B. sudo dpkg -i hp-sdn-ctl_2.0.0.4253_amd64.deb
  C. sudo dpkg -P hp-sdn-ctl_2.0.0.4253_amd64.deb
  D. sudo dpkg -1 hp-sdn-ccl 2.0.0.4253 amd64.deb
  B. sudo dpkg -i hp-sdn-ctl_2.0.0.4253_amd64.deb

  ---

  Install the HP VAN SDN Controller from the directory in which it is stored: ~$ sudo dpkg i hp-sdn-ctl_version_amd64.deb ?Replace version with a value for release version 2.0.1.4254 or greater, as shown in Example. Example: Installing the controller software ~$ sudo dpkg -i hp-sdn-ctl_2.0.1.4254_amd64.deb

  Reference: HP VAN SDN Controller Installation Guide

• Question 69:

  What is an advantage of using the HP Network Optimizer SDN application with UCandC applications rather than just the SDN applications?

  A. It enables the QoS trust boundary to be shifted to the switch.
  B. It enables the UCandC Client to select the UCandC application server optimally located for them.
  C. It removes the need for queuing.
  D. It enables QoS verification for BYOD.
  D. It enables QoS verification for BYOD.

  ---

  

  The first capability that's implemented is the ability of the Lync server (or any communications server, potentially) to dynamically provide to the network controller the IP addresses/ports of the paired endpoints of a real time flow. This enables the network to mark, without deep packet inspection, those flows with a CoS/QoS tag that will give them the proper treatment in the network. This becomes a positive identification of "authorized" real-time flows; any device/flow trying to use that tagging that is not "authorized" through the API can automatically be re-tagged to a best effort service class.

  This technique has a number of critical advantages over current techniques. When compared to the typical VLAN, it enables positive tagging of a variety of devices, including BYOD and potentially other systems that might have multiple traffic types (e.g., a PC running a soft client or a tablet).

  In addition, when compared to deep packet inspection at each access element, it reduces cost as well as eliminating the errors and complexity that encryption of the packet stream can introduce.

  Reference: HP and Microsoft Demo OpenFlow-Lync Applications-optimized Network

• Question 70:

  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

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

  

  Reference: HP VAN SDN Controller Administrator Guide