HP HP2-Z31 Online Practice Questions and Exam Preparation

HP HP2-Z31 Online Questions & Answers

• Question 1:

  A network administrator is attempting to forward HTTP traffic out of port Gigabit Ethernet 2 on an HP 3800 switch. The switch has negotiated to use OpenFlow 1.0 with the HP VAN SDN Controller. Which REST API call will correctly update the flow table of the switch with an entry that does not require active matching traffic to keep the flow entry in the OpenFlow table?

  

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

  ---

  Note: idle_timeout - Number of idle seconds before the flow entry is removed. Defaults to no idle timeout. priority - When using non-exact (wildcarded) matches, this specifies the priority for overlapping matches. Higher values are higher priority. Not important for exact or non-overlapping entries. actions - A list of actions to apply . output: if no group action is specified, forward the packet on the port specified by the output action

• Question 2:

  Which component synchronizes the configuration amongst a team of HP VAN SDN Controllers?

  A. Zookeeper
  B. Cassandra
  C. Virgo
  D. Keystone
  A. Zookeeper

  ---

  ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.

  Incorrect:

  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.

• Question 3:

  Which protocol does HP IMC use to communicate with the HP VAN SDN Controllers?

  A. SNMP
  B. TCL
  C. Open Flow
  D. REST
  D. REST

  ---

  IMC uses a REST interface to manage the HP VAN SDN Controller Reference: Technical white paper, Mock RFI for Enterprise SDN Solutions http://h20195.www2.hp.com/V2/getpdf.aspx/4AA5-1162ENW.pdf (page 5)

• Question 4:

  What happens to an incoming packet that does not have a match in any of the Open Flow tables on an HP Provision switch that operates in passive mode?

  A. The packet is forwarded using legacy forwarding mechanisms.
  B. The packet is forwarded to the HP VAN SDN Controller.
  C. The packet is sent to the control plane of the switch.
  D. The packet is dropped.
  A. The packet is forwarded using legacy forwarding mechanisms.

  ---

  OpenFlow instance mode

  OpenFlow can work either in active or passive mode.

  Passive mode

  There is one-way communication from the OpenFlow controller to the switch. Packets that do not match any flow in the flow table on the switch are not sent to the controller. Such packets of new flows are handled normally by the switch (that

  is using legacy forwarding mechanisms).

  Active mode

  New packets of a flow that the switch is not aware of are sent to the OpenFlow controller.

  Reference: HP Switch Software OpenFlow Administrator's Guide K/KA/WB 15.14

• Question 5:

  A network integrator plans to implement the HP Network Protector SDN application in a network. What is a key consideration with regards to the OpenFlow protocol implementation and switch selection?

  A. If the access switch supports PACKETIN
  B. If the core switch supports PACKETIN
  C. If the access switch supports FORWARD_NORMAL
  D. if the core switch supports FORWARD_NORMAL
  A. If the access switch supports PACKETIN

  ---

  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

• Question 6:

  Which protocol does the LYNC FE Server Plugin use to communicate to the HP Network Optimizer SDN Application?

  A. OpenFlow
  B. SNMPv3
  C. Java Remote Method Protocol
  D. REST
  A. OpenFlow

  ---

  Net Optimizer - Lync uses OpenFlow to dynamically provision the end-to-end network path and QoS policy for that Lync call.

  Reference: HP Network Optimizer SDN Application -Microsoft Lync 1.1 Administrator Guide

• Question 7:

  What are the OpenFlow flow entry timeout values? (Select two.)

  A. Flow timeout
  B. Idle timeout
  C. Soft timeout
  D. Controller timeout
  E. Hard timeout
  B. Idle timeout
  E. Hard timeout

  ---

  OpenFlow flow entry timers include the idle timeout, the hard timeout, and the purge flow timer.

  Reference: Understanding OpenFlow Flow Entry Timers on Devices Running Junos OS http:// www.juniper.net/techpubs/en_US/junos13.3/topics/concept/junos-sdn-openflow-flow- entry-timers- overview.html

• Question 8:

  A customer wants to implement an OpenFlow solution where packets that do not match any flow entries in the OpenFlow table on the switch are not sent to the controller Rather, packets not matching should be handled normally by the switch. Which command enables this functionality on an HP 3800 series switch?

  A. openflow instance sales mode active
  B. openflow instance sales mode normal
  C. openflow instance sales mode passive
  D. openflow instance sales mode hybrid
  C. openflow instance sales mode passive

  ---

  OpenFlow instance mode

  OpenFlow can work either in active or passive mode.

  Passive mode

  There is one-way communication from the OpenFlow controller to the switch. Packets that do not match any flow in the flow table on the switch are not sent to the controller. Such packets of new flows are handled normally by the switch.

  Active mode

  New packets of a flow that the switch is not aware of are sent to the OpenFlow controller.

  Reference: HP Switch Software OpenFlow Administrator's Guide K/KA/WB 15.14 http:// h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03991489-1.pdf (OpenFlow instance mode, passive mode)

• Question 9:

  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.

  ---

  *

  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 10:

  Which framework allows for dynamic insertion and removal of applications in an HP VAN SDN Controller?

  A. cURL
  B. JSON
  C. OSI
  D. OSGi
  D. OSGi

  ---

  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)