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: D

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

Correct Answer: D

Openflow 1.3.1: Support for multiple flow tables is introduced Reference: Open Flow 1.3.1 Support: Controller View https://wiki.opendaylight.org/images/d/dc/Openflow1.3_Support_for_Opendaylight.pdf

Correct Answer: B

HP IMC Dashboard figure:

My Network view (within SDN Manager Dashboard):

Reference: Review: HP Intelligent Management Center (IMC)

Correct Answer: D

OpenFlow instance connection interruption mode

You can set the type of behavior when the switch loses connection with the controller.

OpenFlow instance connection interruption mode

fail-secure

If the switch loses connection with all of the controllers, packets and messages destined to the current

controller are dropped. Flows continue to expire according to their time-outs.

Default: fail-secure

Reference: HP OpenFlow Switches

(page 21)

http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03512348-4.pdf

Correct Answer: A

Table ID n/a indicates that OpenFlow 1.0 is in use. Example of the Flows View for a Specific OpenFlow Device

The "Table ID" field applies to OpenFlow 1.3 and greater, but not to OpenFlow 1.0.

Reference: HP VAN SDN Controller Administrator Guide

Correct Answer: B

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

Correct Answer: A

Note:

The OSGi specification describes a modular system and a service platform for the Java programming

language that implements a complete and dynamic component model, something that does not exist in

standalone Java/VM environments. Applications or components, coming in the form of bundles for

deployment, can be remotely installed, started, stopped, updated, and uninstalled without requiring a

reboot; management of Java packages/classes is specified in great detail. Application life cycle

management is implemented via APIs that allow for remote downloading of management policies. The

service registry allows bundles to detect the addition of new services, or the removal of services, and adapt

accordingly.

Incorrect:

Not Zookeeper: ZooKeeper is a centralized service for maintaining configuration information, naming,

providing distributed synchronization, and providing group services. Not Cassandra: Apache Cassandra is

an open source distributed database management system designed to handle large amounts of data

across many commodity servers, providing high availability with no single point of failure.

Not Keystone: The SDN controller uses Openstack Keystone as an identity management for managing

users, generating tokens, as well as token validation.

Correct Answer: D

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

Correct Answer: D

OSGi was thus selected to allow elasticity of applications. The applications can be dynamically introduced and dynamically removed from a running environment without having to shut down the whole controller and then restart it. Using a network analogy again, the applications are "hot- swappable".

Reference: HP Virtual Application Networks SDN Controller Technical Solution Guide http://www8.hp.com/ h20195/v2/GetPDF.aspx%2Fc04219919.pdf (page 11 and 12)

Correct Answer: C

* Northbound API Relative to figure 1 below, the Northbound API is the API that enables communications between the control layer and the application layer (external business applications. Southbound API

Relative to Figure 1 below, the Southbound API is the API that enables communications between the control layer and the infrastructure layer (OpenFlow).

Figure 1. ONF's SDN architecture

* Putting the region configurations in place in a controller team ensures seamless failover and failback among the configured controllers for the specified network devices in a region. That is, when a master controller experiences a fault, the Role Orchestration Service ensures that a slave controller immediately assumes the master role over the group of network devices to which the failed controller was in the master role.

Reference: Technical white paper, Mock RFI for Enterprise SDN Solutions Reference: HP VAN SDN Controller Administrator Guide

Correct Answer: B

Note: TopologyViewer Creates and updates a network graph for visualizing the network the controller discovers. The Topology Viewer uses the services of the Topology Manager and Link Manager.

Correct Answer: C

The Support Logs function automatically maintains an internal record of events of interest from the operations of an active SDN controller.

Configure the Support Log for Queue Size The default queue size is 100 lines. To configure a different queue size, change the value for the max.display.rows key in the adm.log.impl.LogManager Configurations component.

Reference: HP VAN SDN Controller Administrator Guide

Correct Answer: B

The SDN controller uses Openstack Keystone as an identity management for managing users, generating tokens, as well as token validation.

Reference: HP VAN SDN Controller Administrator Guide