HP2-Z31 Online Practice Questions and Answers

Correct Answer: A

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

Correct Answer: CD

C: UCandC signaling can be routed through centralized UCandC infrastructure components and that all

interactions.

D (not A): UCandC signaling traffic is identified using the well know transport and port numbers used by the

UCandC signaling protocol.

Reference: Automating QoS (page 7, bullet # 2) http://johnacook.files.wordpress.com/2014/03/2014_02_27_use_case.pdf

Correct Answer: DE

The following licenses are available for the HP VAN SDN Controller:

* (D) Base controller license (HP VAN SDN Ctrl Base SW w/ 50node E-LTU)--Enables the HP VAN SDN Controller to communicate with up to 50 OpenFlow switches. This license is a prerequisite for the other licenses, and must be installed for you to receive technical support during your first 90 days of use. *(E) Base controller plus 50 "Add Nodes" license (HP VAN SDN Ctrl 50node E-LTU)-- Extends by 50 the number of switches the base controller can communicate with using OpenFlow. In addition, you can install the Add Nodes license multiple times. For example: If you install one Add Nodes license on an HP VAN SDN Controller with a base license present, the total number of OpenFlow switches supported is 100. If you install three Add Nodes licenses on an HP VAN SDN controller with a base license, the total number of OpenFlow switches supported is 200. Etc.

Reference: HP VAN SDN Controller License Registration and Activation Guide

Correct Answer: D

The controller:

Supports multiple OpenFlow versions at the same time.

Negotiates with each OpenFlow switch for the highest common

OpenFlow version between the switch and controller.

Reference: HP VAN SDN Controller and Applications Support Matrix, Supported OpenFlow versions

Correct Answer: A

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

Correct Answer: A

Note:

*

The PacketIn message is a way for the switch to send a captured packet to the controller. There are two reasons why this might happen; there could be an explicit action as a result of a match asking for this behavior, or from a miss in the match tables, or a ttl error.

*

Flowchart detailing packet flow through an OpenFlow switch.

Reference: OpenFlow Switch Specification Version 1.3.1

Correct Answer: B

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

Correct Answer: C

In Aggregation mode, all VLANs in the switch are part of an OpenFlow instance. When Aggregation is configured, there is only OpenFlow traffic, no production traffic.

Reference: HP OpenFlow 1.3 Administrator Guide, Wired Switches K/KA/KB/WB 15.15

Correct Answer: A

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

Correct Answer: D

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 ?