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HP HP2-Z31 Exam Practice Questions (P. 5)

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Question #21
An HP Provision switch loses its OpenFlow connection to the HP VAN SDN Controller. How is traffic processed by default if no controller teaming is configured?
  1. A
    Packets and messages destined to the controller are dropped. Flows continue to expire according to their time-outs. This is because the default setting on HP Provision switches is fail-standalone.
  2. B
    Packets and messages of new flows behave as a legacy switch or router would. Existing flows of this OpenFlow instance are removed. This is because the default setting on HP Provision switches is fail-standalone.
  3. C
    Packets and messages of new flows behave as a legacy switch or router would. Existing flows of this OpenFlow instance are removed. This is because the default setting on HP Provision switches is fail-secure.
  4. D
    Packets and messages destined to the controller are dropped. Flows continue to expire according to their time-outs. This is because the default setting on HP Provision switches is fail-secure.

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 -

http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03512348-4.pdf
(page 21)

Question #22
An administrator wants the switches to forward traffic in the legacy mode. If all the controllers fail, which action should the administrator take?
  1. A
    Install a packetin rule as the lowest priority rule in the flow table.
  2. B
    Configure the instance to fail in standalone mode.
  3. C
    Install a packet_out rule as the lowest priority rule in the flow table.
  4. D
    Configure the instance to fail in interruption mode.

Correct Answer:
B
OpenFlow instance connection interruption mode
You can set the type of behavior when the switch loses connection with the controller.

fail-standalone
If the switch loses connection with all of the controllers, packets and messages of new flows behave as a legacy switch or router would. Existing flows of this
OpenFlow instance are removed.

Reference: HP OpenFlow Switches -

http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03512348-4.pdf
(page 21)

Question #23
Refer to the exhibit.

An SDN developer has tried use RSDoc to dis-cover the datapaths in the network. However, the error in the exhibit is displayed. Why is an error returned rather than the datapaths?
  1. A
    RSDoc does not support the submission of datapath requests until a token has been received oURL.
  2. B
    A username and password has not been submitted to the controller via RSDoc.
  3. C
    A Service Token has been submitted to the controller via the Token field in RSDoc.
  4. D
    An Auth Token has not been submitted to the controller via the Token field in RSDoc.

Correct Answer:
D
This is an AuthenticationException.
Note: The SDN controller relies on token-based authentication to authenticate its REST APIs. In other words, all REST APIs except the /auth and /rsdoc APIs require an authentication token embedded in an "X-Auth-Token" header to be included with each REST request. The /auth API allows you to obtain a token, while the /rsdoc API provides live REST API documentation information about the controllers REST API.
Reference: HP VAN SDN Controller Administrator Guide

Question #24
An HP VAN SDN Controller team is configured consisting of three controllers, using default settings.
✑ The first controller is configured with IP address 10.1.1.1 and priority 10.
✑ The second controller is configured with IP address 10.1.1.2 and priority 20.
✑ The third controller is configured with IP address 10.1.1.3 and priority 30.
Currently the third controller (IP address 10.1.1.3) is the leader device. An administrator reboots the third controller.
Which controller will be the leader once this controller comes back online?
  1. A
    the controller with the IP address 10.1.1.3
  2. B
    the controller with the IP address 10.1.1.1
  3. C
    the controller with the IP address 10.1.1.2
  4. D
    The leader role will be shared amongst all team members.

Correct Answer:
C
Once a team is configured, the configuration and monitoring of team members and their associated OpenFlow switches is performed by the team manager. If the team manager goes down, the controller with the next highest priority in the team configuration becomes the team manager.

Note: Team Management -
Each controller belonging to a team is a team member. To centralize team management and control, one controller is designated as the team manager. Teaming is configured on one controller and is automatically propagated to the other controllers in the team, regardless of which controller becomes the team manager.
Reference: HP VAN SDN Controller Administrator Guide

Question #25
Refer to the exhibit.

Mininet is being used by a developer to test an OpenFlow RESTful API application developed in Python. The developer is able to view the switches in the
OpenFlow topology diagram shown in the exhibit, but no hosts are displayed in the topology diagram. The same behavior is seen when making a RESTful API call for nodes via the RESTful API. Switch information is provided via API calls from the HP VAN SDN Controller, but no nodes are shown.
What is a possible issue?
  1. A
    Traffic needs to be sent by the Mininet nodes before they will be discovered by the HP VAN SDN Controller.
  2. B
    The developer is using the incorrect API calls and needs to ensure that tokens are sent when requesting information from the HP VAN SDN Controller
  3. C
    OpenFlow communication between Mininet and the HP VAN SDN Controller is not functioning correctly. Wireshark can be used to aid with troubleshooting the OpenFlow communication.
  4. D
    The Topology Service has been stopped on the HP VAN SDN Controller and needs to be started.

Correct Answer:
D
The Topology service is used to create a network graph and compute the shortest path between two hosts.
Note: Mininet is a network emulator that can create and emulate an entire OpenFlow network locally on your PC.
Incorrect:
Not C: No need to analyze packages.
Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education.
Reference: HP VAN SDN Controller Administrator Guide

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