HP HP Certifications HP0-Y47 Questions & Answers

• Question 11:

  Refer to the exhibit. Exhibit 1

  

  Exhibit 2

  

  The HP Intelligent Resilient Framework (IRF) virtual devices shown in the Exhibit 1 support traffic for servers in VLAN 2-10. To enhance resiliency, the network administrator configures MAD on both IRF virtual switches. The administrator has established the settings shown in the exhibit 2. The configuration has an issue.

  How can the administrator correct the issue?

  A. Activate the Bidirectional Forwarding Detection (BFD) MAD 1 on IRF 1 and IRF 2.

  B. Exclude the ports in BAGG 1 from MAD on IRF 1 and IRF 2.

  C. Change the domain ID on IRF 2 to a unique ID.

  D. Enable extended Link Layer Control Protocol Data Units (LACPDUs) on IRF 1 and IRF 2.

  Correct Answer: C

  NOT ALL IMAGE CHECK for EXAMPLE THIS example there are BFD MAD http://www.certificationexplorer.com/Documents/HP0-Y47.pdf

  http://abouthpnetworking.com/2014/02/01/comware7-irf-mad-lacp-new-selection-method/ http://abouthpnetworking.com/2014/11/08/provision-support-for-irf-mad- lacp-split-brain-detection/ http://h20565.www2.hp.com/hpsc/doc/public/display? docId=emr_na-c02648772

• Question 12:

  Refer to the exhibit.

  

  IRF 3 and Switches 1, 2 and 4 are successfully implementing OSPF on the interfaces shown in the exhibit. Then IRF 3's 10.1.10/24 link fails. Connectivity between Server 1 and Server 2 is disrupted for about 30 seconds. What can the network administrator do to prevent this issue from occurring again?

  A. Enable opaque LSAs on each of the switches; set the OSPF graceful restart mode to IETF mode on at least IRF 3.

  B. Set the OSPF dead timer on each of the switches to equal the hello timer

  C. Set up OSPF Bidirectional Forwarding Detection (BFD) on each switch VLAN 10 interface.

  D. On IRF 3, set up Bidirectional Forwarding Detection (BFD) Multi-Active Detection (MAD) on a dedicated link between the members.

  Correct Answer: A

• Question 13:

  Refer to the exhibit.

  

  The current software on the Intelligent Resilient Framework (IRF) virtual device shown in the exhibit is version 1104. The network administrator wants to upgrade to software version 1105. What will happen when the administrator attempts to use In-Service Software Upgrade (ISSU) for this upgrade?

  A. The IRF virtual device will not accept the ISSU commands. It will output various error messages.

  B. When the administrator executes the switch over to the new master, a rollback will occur, causing the software to revert to the previous version.

  C. The process can complete successfully. Some links might go down, causing temporary failovers within link aggregation groups.

  D. When the administrator executes the switchover to the new master, an outage will occur while this master reboots.

  Correct Answer: C

  http://abouthpnetworking.com/2014/03/24/comware5-issu-incompatible/ http://abouthpnetworking.com/2014/03/24/comware5-issu-compatible/

• Question 14:

  An HP switch is a member of an Intelligent Resilient Framework (IRF) virtual device that has two members. What is a proper situation for issuing the mad restore command on this switch?

  A. The IRF link has failed, and MAD has caused a new member to become master. The administrator wants to restore the previous master's MAC address.

  B. The IRF link has failed, and MAD placed this member in recovery mode. The administrator wants the switch to automatically repair the failed link.

  C. The IRF link has failed, and the administrator needs to put this switch in MAD recovery mode.

  D. The IRF link has failed, and MAD placed this member in recovery mode. The active member has gone offline.

  Correct Answer: B

  http://www.manualslib.com/manual/579819/Hp-6125xlg.html?page=27

  Restore the normal MAD state of the IRF fabric in Recovery state.

  Use mad restore to restore the normal MAD state of the IRF fabric in Recovery state. When MAD detects that an IRF fabric has split into multiple IRF fabrics, only the one whose master has the lowest member ID among all the masters can

  still forward traffic. All the other fabrics are set in Recovery state and cannot forward traffic.

• Question 15:

  Refer to the exhibit.

  

  A company has a functional multicast routing solution, which routes multicasts from the data center users in VLAN3 and VLAN4. Users in VLAN 3 and VLAN 4 sometimes register for some of the same multicast. The network administrator wants to prevent duplicate multicasts on the link between the core IRF virtual switch and the access layer IRF virtual switches.

  What should the administrator do to accomplish this goal?

  A. Enable IGMP snooping on VLAN 3 and VLAN4 (Layer 2) on the core switch and on the access layer switches.

  B. Create Layer 3 interfaces for VLAN 3 and VLAN 4 on the access layer switches, and enable IGMP on the interfaces.

  C. Enable Multicast VLAN and IGMP snooping on VLAN 3 on the access layer switches, and associate VLAN 4 as a sub-VLAN.

  D. Create Layer 3 interfaces for VLAN 3 and VLAN 4 on the access layer switches, and enable PIM on the interfaces.

  Correct Answer: A

• Question 16:

  In which components of HP FlexNetwork solutions can Intelligent Resilient Framework (IRF) play a role?

  A. IRF can operate at any layer of both campus and data center solutions.

  B. IRF can operate at the access layer of both campus and data center solutions. It cannot operate at the core.

  C. IRF can operate within data center solutions but not in campus solutions.

  D. IRF can operate at the core of both campus and data center solutions. It cannot operate at the access layer.

  Correct Answer: D

• Question 17:

  Refer to the exhibit.

  

  The HP 3800 switch with member ID 1 shown in the exhibit goes down. What happens?

  A. Switch 2 becomes the commander

  B. Switch 2 becomes the commander

  C. Switch 4 becomes the commander

  D. The switch that has the longest uptime becomes master

  Correct Answer: B

  When a Switch Crashes and Reboots Commander - The standby takes over as the new Commander

  -A new standby is elected

  -

  Crashing switch writes core file to local stable storage

  -

  Crashing switch reboots and join stack

  -Core file and crash information for this switch is available from Commander Standby - A new standby is elected

  -

  Crashing switch writes core file to local stable storage

  -

  Crashing switch reboots and joins the stack

  - Core file and crash information for this switch is available from the Commander Member - Crashing switch writes core file to local stable storage

  -Crashing switch reboots and joins the stack

  -Core file and crash information for this switch is available from the Commander

• Question 18:

  Four HP 3800 Series Switches have formed a backplane stack in a ring topology. Member 1 is the commander the two stacking links on the member 1 fail. What happens?

  A. If LACP Multi-Active Detection (MAD) is enabled and the stack connects to a ProVision switch on a link aggregation, member 2, 3 and 4 and shutdown the ports Otherwise, no ports are disabled

  B. If LACP Multi-Active Detection (MAD) is enabled member 1 shuts down all of its ports. Otherwise, no ports are disabled

  C. If the split policy is one-fragment-up member 1 shuts down all of its ports

  D. If the switch policy is one-fragment-up members 2, 3, and 4 shut down all of their ports

  Correct Answer: C

  Results of Disconnecting a Stacking Cable

  If a stacking cable becomes disconnected from one of the switches in the stack, the effect depends on the stacking topology that is being used:

  Mesh--The stack topology is temporarily changed to a ring. To recover, simply reconnect the stacking cable; the mesh topology and the previous stack configuration is restored.

  Ring--There is little effect. The stack topology is temporarily changed to a chain topology. To recover, simply reconnect the stacking cable; the ring topology and the previous stack configuration is restored.

  Chain--The following occurs:

  The smaller section (fragment) of the stack that results from the disconnection becomes Inactive (the Stack Status value shown in the output of the show stacking command is Inactive).

  If the two resulting fragments are the same size, the fragment that contains the Commander will be Active, and the other fragment becomes Inactive.

  Both fragments will have a Commander and a Standby selected (if there is more than one switch in each fragment).

  When the stacking cable is reconnected to reform the chain:

  The Commander and Standby of the Active fragment retain those roles for the resulting stack. If the original Commander was not in that fragment, then the stack will have a new Commander when the stack is reformed. The switches in the Inactive fragment reboot and assume their new roles in the reformed chain.

  Stack fragment - A stack that previously had more members (that is, some of its previous members are now missing). The fragment can be Active or Inactive based on the rules described.

  Active Stack fragment - When a stack becomes fragmented, only one fragment remains Active; the other fragments become Inactive (all network ports are disabled). The active stack fragment inherits the MAC address and IP addressing of the stack for management. The fragment that has more switches in it will be the Active fragment. This allows more of the network ports to remain operational. If the fragments have the same number of switches in them, then the fragment that has the original Commander will be the Active fragment.

  Inactive Stack fragment - The switches in this fragment do not actively switch packets. They are powered on, however, the network ceases to carry traffic. All user ports are disabled. Only the OOBM and stack ports remain active.

  http://h20565.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c03018186

• Question 19:

  Refer to the exhibit.

  

  Which route to 203.0.13.0/24 will the switch BGP process propose to the routing table?

  A. A null route

  B. A route through 192.0.2.2

  C. A route through 198.5.100.1

  D. A route through 198.5.100.1 and 192.0.2.1

  Correct Answer: B

• Question 20:

  Refer to the exhibit.

  

  IRF 1, at the campus core campus core, enables Internet Group Management Protocol (IGMP) on its VLAN3 interface. IRF 1 is also part of a multicast routing solution with the data center infrastructure devices. How can a network administrator ensure that only endpoints that have registered for multicasts destined to 239.1.1.1 receive these multicasts?

  A. On every campus IRF virtual switch, set VLAN 3 as the multicast VLAN

  B. On IRF 1, enable IGMP snooping on VLAN3

  C. On each access layer IRF virtual switch, enable IGMP snooping on VLAN 3

  D. On each access layer IRF virtual switch, create a Layer 3 interface VLAN3. Enable IGMP on that interface

  Correct Answer: C

  http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/H3C_S12500_Series _Switches/Configuration/Operation_Manual/ H3C_S12500_CG-Release71286W710/07/201301/772657_1285_0.htm