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300-165 Real Tests (May 2017)

[Free] 2017(May) Ensurepass Testinsides Cisco 300-165 Real Tests 31-40

May 3, 2017

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2017 May Cisco Official New Released 300-165 Q&As
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Implementing Cisco Data Center Infrastructure (DCII) v6.0

QUESTION 31

Which topology is not supported when using vPC?

 

A.

a single-homed server to a single FEX that is connected to two Cisco Nexus 5500 Series Switches

B.

a dual-homed server to two FEXs, each connected to two Cisco Nexus 5500 Series Switches

C.

a dual-homed server to two FEXs that are connected to one Cisco Nexus 5500 Series Switch

D.

a dual-homed server to a single FEX that is connected to two Cisco Nexus 5500 Series Switches

 

Correct Answer: C

Explanation:The figure shows unsupported topology where a vPC is between hosts and two FEXs that are connected to one Cisco Nexus 5500 Series device. This topology does not provide a good high availability solution because the server loses the connectivity to the network when the Cisco Nexus 5000 Series device fails.

 

Figure: Unsupported Topology–Host vPC With One Cisco Nexus 5000 Series Device

 

clip_image001

 

If you need to connect a multi-homing server to a pair of FEXs when there is only one Cisco Nexus 5000 Series device, you have the option to run active or standby NIC teaming from the server.

 

Reference: http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/mkt_ops_guides/513_n1_1/n5k_enhanced_vpc.html

 

QUESTION 32

Refer to the exhibit. Which three statements about the Cisco Nexus 7000 switch are true? (Choose three.)

 

clip_image003

 

A.

An emulated switch ID must be unique when the vPC+ feature is used.

B.

Switches with FabricPath and vPC+ consume two switch IDs.

C.

Emulated switch IDs must be numbered from 1 to 99.

D.

Each switch ID must be unique in the FabricPath topology.

E.

Switch IDs must be configured manually.

 

Correct Answer: BDE

Explanation:To understand this feature, please refer to the link given below.

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/guide_c07-690079.html#wp9000065

 

 

QUESTION 33

Refer to the exhibit. Which corrective action is taken to resolve the problem?

 

clip_image005

A.

Trunk four VLANs on interface ethernet 199/1/1.

B.

Use the shut and no shut interface ethernet 199/1/1so that the VLANs come up.

C.

Place interface ethernet 199/1/1 in VLAN 4 in the N5K-2 configuration.

D.

Prune all but four VLANs from vPC 199.

E.

Add VLAN 4 to vPC 199.

 

Correct Answer: C

Explanation:Place interface ethernet 199/1/1 in VLAN 4 in the N5K-2 configuration.

 

 

QUESTION 34

Which function does the graceful restart feature allow a Cisco Nexus 7000 Series router to perform?

 

A.

Perform a rapid route convergence.

B.

Initialize a standby supervisor transparently when one is present.

C.

Remain in the data forwarding path through a process restart.

D.

Maintain a management connection throughout a router restart.

 

Correct Answer: C

Explanation:Graceful Restart and Non Stop Routing both allow for the forwarding of data packets to continue along known routes while the routing protocol information is being restored (in the case of Graceful Restart) or refreshed (in the case of Non Stop Routing) following a processor switchover. When Graceful Restart is used, peer networking devices are informed, via protocol extensions prior to the event, of the SSO capable routers ability to perform graceful restart. The peer device must have the ability to understand this messaging. When a switchover occurs, the peer will continue to forward to the switching over router as instructed by the GR process for each particular protocol, even though in most cases the peering relationship needs to be rebuilt. Essentially, the peer router will give the switching over router a “grace” period to re-establish the neighbor relationship, while continuing to forward to the routes from that peer.

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/high-availability/solution_overview_c22-487228.html

 

 

QUESTION 35

A Cisco Nexus 2000 Series Fabric Extender is connected to two Cisco Nexus 5000 Series switches via a vPC link. After both Cisco Nexus 5000 Series switches lose power, only one switch is able to power back up. At this time, the Cisco Nexus 2000 Series Fabric Extender is not active and the vPC ports are unavailable to the network. Which action will get the Cisco Nexus 2000 Series Fabric Extender active when only one Cisco Nexus 5000 Series switch is up and active?

 

A.

Move the line from the failed Cisco Nexus 5000 Series switch to the switch that is powered on, so the port channel forms automatically on the switch that is powered on.

B.

Shut down the peer link on the Cisco Nexus 5000 Series switch that is powered on.

C.

Configure reload restore or auto-recovery reload-delay on the Cisco Nexus 5000 Series switch that is powered on.

D.

Power off and on the Cisco Nexus 2000 Series Fabric Extender so that it can detect only one Cisco Nexus 5000 Series switch at power up.

 

Correct Answer: C

Explanation:The vPC consistency check message is sent by the vPC peer link. The vPC consistency check cannot be performed when the peer link is lost. When the vPC peer link is lost, the operational secondary switch suspends all of its vPC member ports while the vPC member ports remain on the operational primary switch. If the vPC member ports on the primary switch flaps afterwards (for example, when the switch or server that connects to the vPC primary switch is reloaded), the ports remain down due to the vPC consistency check and you cannot add or bring up more vPCs.

Beginning with Cisco NX-OS Release 5.0(2)N2(1), the auto-recovery feature brings up the vPC links when one peer is down. This feature performs two operations:

If both switches reload, and only one switch boots up, auto-recovery allows that switch to assume the role of the primary switch. The vPC links come up after a configurable period of time if the vPC peer-link and the peer-keepalive fail to become operational within that time. If the peer-link comes up but the peer-keepalive does not come up, both peer switches keep the vPC links down. This feature is similar to the reload restore feature in Cisco NX- OS Release 5.0(2)N1(1) and earlier releases. The reload delay period can range from 240

When you disable vPCs on a secondary vPC switch because of a peer-link failure and then the primary vPC switch fails, the secondary switch reenables the vPCs. In this scenario, the vPC waits for three consecutive keepalive failures before recovering the vPC links.

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_vpc_ops.html

 

 

QUESTION 36

Refer to the exhibit. What is the consequence of configuring peer-gateway on the two vPC peers N7K-1 and N7K-2?

 

clip_image006

 

A.

Nothing, this is the standard vPC configuration to make the feature work.

B.

The downstream device detects only one of the vPC peers as its gateway.

C.

The downstream device can use DMAC of N7K-1 on the link to N7K-2, and N7K-2 forwards the packet.

D.

This configuration enables the downstream device to use DHCP to obtain its default gateway.

 

Correct Answer: C

Explanation:Beginning with Cisco NX-OS 4.2(1), you can configure vPC peer devices to act as the gateway even for packets that are destined to the vPC peer device’s MAC address. Use the peer-gateway command to configure this feature. Some network-attached storage (NAS) devices or load-balancers may have features aimed to optimize the performances of particular applications. Essentially these features avoid performing a routing-table lookup when responding to a request that originated form a host not locally attached to the same subnet. Such devices may reply to traffic using the MAC address of the sender Cisco Nexus 7000 device rather than the common HSRP gateway. Such behavior is non-complaint with some basic Ethernet RFC standards. Packets reaching a vPC device for the non-local router MAC address are sent across the peer-link and could be dropped by the built in vPC loop avoidance mechanism if the final destination is behind another vPC.

The vPC peer-gateway capability allows a vPC switch to act as the active gateway for packets that are addressed to the router MAC address of the vPC peer. This feature enables local forwarding of such packets without the need to cross the vPC peer-link. In this scenario, the feature optimizes use of the peer-link and avoids potential traffic loss. Configuring the peer-gateway feature needs to be done on both primary and secondary vPC peers and is non-disruptive to the operations of the device or to the vPC traffic. The vPC peer-gateway feature can be configured globally under the vPC domain submode. When enabling this feature it is also required to disable IP redirects on all interface VLANs mapped over a vPC VLAN to avoid generation of IP redirect messages for packets switched through the peer gateway router. When the feature is enabled in the vPC domain, the user is notified of such a requirement through an appropriate message. Packets arriving at the peer-gateway vPC device will have their TTL decremented, so packets carrying TTL = 1 may be dropped in transit due to TTL expire. This needs to be taken into account when the peer-gateway feature is enabled and particular network protocols sourcing packets with TTL = 1 operate on a vPC VLAN.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_2/nx-os/interfaces/configuration/guide/if_nxos/if_vPC.html

 

 

QUESTION 37

Which two types of traffic are carried over a vPC peer link when no failure scenarios are present? (Choose two.)

 

A.

multicast data traffic

B.

unicast data traffic

C.

broadcast data traffic

D.

vPC keep-alive messages

 

Correct Answer: AC

Explanation:The vPC peer link is the link used to synchronize states between the vPC peer devices. The vPC peer link carries control traffic between two vPC switches and also multicast, broadcast data traffic. In some link failure scenarios, it also carries unicast traffic. You should have at least two 10 Gigabit Ethernet interfaces for peer links.

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

 

 

QUESTION 38

Which statement about electronic programmable logic device image upgrades is true?

 

A.

EPLD and ISSU image upgrades are nondisruptive.

B.

An EPLD upgrade must be performed during an ISSU system or kickstart upgrade.

C.

Whether the module being upgraded is online or offline, only the EPLD images that have different current and new versions are upgraded.

D.

You can execute an upgrade or downgrade only from the active supervisor module.

 

Correct Answer: D

Explanation:You can upgrade (or downgrade) EPLDs using CLI commands on the Nexus 7000 Series device. Follow these guidelines when you upgrade or downgrade EPLDs:

You can execute an upgrade from the active supervisor module only. All the modules, including the active supervisor module, can be updated individually.

 

You can individually update each module whether it is online or offline as follows:

If you upgrade EPLD images on an online module, only the EPLD images with version numbers that differ from the new EPLD images are upgraded.

On a system that has two supervisor modules, upgrade the EPLDs for the standby supervisor and then switch the active supervisor to standby mode to upgrade its EPLDs.

On a system that has only one supervisor module, you can upgrade the active supervisor, but this will disrupt its operations during the upgrade.

If you interrupt an upgrade, you must upgrade the module that is being upgraded again.

The upgrade process disrupts traffic on the targeted module.

Do not insert or remove any modules while an EPLD upgrade is in progress.

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_0/epld/release/notes/epld_rn.html

 

 

QUESTION 39

Which three Cisco UCS C-Series CNAs support Adapter FEX? (Choose three.)

 

A.

Qlogic QLE8152

B.

Broadcom BCM57712

C.

Cisco UCS P81E

D.

Cisco UCS VIC 1220

E.

Emulex OCe10102-FX-C

F.

Intel X520

 

Correct Answer: BCD

Explanation:http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c-series_integration/ucsm2-1/b_UCSM2-1_C-Integration/b_UCSM2-1_C-Integration_chapter_011.html#reference_D644111FC68046F0BEA49756A0834664

 

 

QUESTION 40

Which two Cisco Nexus platforms support Adapter FEX? (Choose two.)

 

A.

Cisco Nexus 7000 Series Switches

B.

Cisco Nexus 5000 Series Switches

C.

Cisco Nexus 5500 Series Switches

D.

Cisco Nexus 4000 Series Switches

E.

Cisco Nexus 2000 Series Fabric Extenders

 

Correct Answer: CE

Explanation:At the access layer, the Adapter-FEX requires a FEX-enabled adapter on a server that connects to a parent device that supports virtualization of interfaces. The Adapter-FEX is supported on the following platforms:

The Cisco Unified Computing System (UCS) platform supports Adapter-FEX between UCS servers and the UCS Fabric Interconnect.

The Adapter-FEX is supported on the Cisco Nexus 5500 Series platform and on the Cisco Nexus 2200 Fabric Extender that is connected to a Cisco Nexus 5500 Series parent device. This implementation works on a variety of FEX-capable adapters, including the Cisco UCS P81E virtual interface card (VIC) adapter for the UCS C-Series platform and third party adapters such as the Broadcom BCM57712 Convergence Network Interface Card, that implement the virtual network tag (VNTag) technology.

Reference:http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/adapter_fex/513_n1_1/ops_adapter_fex/ops_using_adapter_fex.html

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