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642-997 Latest Exam (Nov 2017)

[Free] 2017(Nov) Dumps4cert Pass4sure Cisco 642-997 Dumps with VCE and PDF 21-30

November 9, 2017

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2017 Nov Cisco Official New Released 642-997
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Implementing Cisco Data Center Unified Fabric

Question No: 21 – (Topic 2)

How is a dynamic vNIC allocated?

  1. Dynamic vNICs are assigned to VMs in vCenter.

  2. Dynamic vNICs can only be bound to the service profile through an updating template.

  3. Dynamic vNICs are bound directly to a service profile.

  4. Dynamic vNICs are assigned by binding a port profile to the service profile.

Answer: C Explanation:

The dynamic vNIC connection policy determines how the connectivity between VMs and dynamic vNICs is configured. This policy is required for Cisco UCS domains that include servers with VIC adapters on which you have installed VMs and configured dynamic vNICs. Each dynamic vNIC connection policy includes an Ethernet adapter policy and designates the number of vNICs that can be configured for any server associated with a service profile that includes the policy.

For VM-FEX that has all ports on a blade in standard mode, you need to use the VMware adapter policy.

For VM-FEX that has at least one port on a blade in high-performance mode, use the VMwarePassThrough adapter policy or create a custom policy. If you need to create a custom policy, the resources provisioned need to equal the resource requirements of the guest OS that needs the most resources and for which you will be using high-performance mode.

Reference: http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/vm_fex/vmware/gui/config

_guide/b_GUI_VMware_VM-FEX_UCSM_Configuration_Guide/b_GUI_VMware_VM- FEX_UCSM_Configuration_Guide_chapter_010.html

Topic 3, Manage the Unified Fabric in a Cisco Data Center Architecture

Question No: 22 – (Topic 3)

Which Cisco Nexus feature is best managed with DCNM-SAN?

  1. VSS

  2. domain parameters

  3. virtual switches

  4. AAA

Answer: B Explanation:

The Fibre Channel domain (fcdomain) feature performs principal switch selection, domain ID distribution, FC ID allocation, and fabric reconfiguration functions as described in the FC-SW-2 standards. The domains are configured on a per VSAN basis. If you do not

configure a domain ID, the local switch uses a random ID. This section describes each fcdomain phase:

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Principal switch selection – This phase guarantees the selection of a unique principal switch across the fabric.

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Domain ID distribution – This phase guarantees each switch in the fabric obtains a unique domain ID.

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FC ID allocation – This phase guarantees a unique FC ID assignment to each device attached to the corresponding switch in the fabric.

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Fabric reconfiguration – This phase guarantees a resynchronization of all switches in the fabric to ensure they simultaneously restart a new principal switch selection phase.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/5_2/configuration/g uides/sysmgnt/DCNM-SAN/sysmgmt_dcnm/sysmgmt_overview.html#wp1051962

Question No: 23 – (Topic 3)

Which of the following Cisco Nexus features is best managed with DCNM-LAN?

  1. VSS

  2. Domain parameters

  3. Virtual switches

  4. AAA

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Answer: C Explanation:

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DCNM-LAN supports the following platforms:

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Cisco Nexus 1000V switches

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Cisco Nexus 2000 Fabric Extenders

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Cisco Nexus 5000 Series switches

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Catalyst 6500

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DCNM-LAN provides limited support for the Catalyst 6500 Series switches that runs classic IOS version 12.2(33)SXI or higher.

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DCNM-LAN supports the viewing of the current configuration attributes of the device.

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DCNM-LAN does not support changing the configuration of the device.

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DCNM-LAN supports the Firewall Service Module (FWSM) version 4.0 or higher for the Catalyst 6500 Series switches.

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Cisco Nexus 7000 Series switches

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/5_2/configuration/g uides/fund/DCNM-SAN-LAN_5_2/DCNM_Fundamentals/fund_overview.html

Question No: 24 DRAG DROP – (Topic 3)

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Drag the description on the left to the most appropriate Nexus product on the right.

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Answer:

Question No: 25 – (Topic 3)

Which option is a restriction of the unified ports on the Cisco UCS 6200 Series Fabric Interconnect when connecting to the unified fabric network?

  1. Direct FC connections are not supported to Cisco MDS switches

  2. The FCoE or Fibre Channel port allocations must be contiguous on the 6200.

  3. 10-G Fibre Channel ports only use SFP interfaces.

  4. vPC is not supported on the Ethernet ports.

Answer: B Explanation:

When you configure the links between the Cisco UCS 2200 Series FEX and a Cisco UCS 6200 series fabric interconnect in fabric port channel mode, the available VIF namespace on the adapter varies depending on where the FEX uplinks are connected to the fabric interconnect ports.

Inside the 6248 fabric interconnect there are six sets of eight contiguous ports, with each set of ports managed by a single chip. When uplinks are connected such that all of the uplinks from an FEX are connected to a set of ports managed by a single chip, Cisco UCS Manager maximizes the number of VIFs used in service profiles deployed on the blades in the chassis. If uplink connections from an IOM are distributed across ports managed by separate chips, the VIF count is decreased.

Reference: http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/hw/6200-install- guide/6200_HIG/6200_HIG_chapter_01.html

Question No: 26 – (Topic 3)

The Connectivity Management Processor monitors the active supervisor module on a Cisco Nexus 7000 switch and will reboot the device in the event of a lights-out management issue. However, which option includes features that provide similar benefits in the absence of the Connectivity Management Processor?

  1. high-availability functionality from features such as vPC and NSF

  2. traditional system connectivity models like SNMP, GUI, or SSH

  3. Cisco FabricPath

  4. VDC failover

Answer: A Explanation:

vPC uses the vPC peer-keepalive link to run hello messages that are used to detect a dual- active scenario. A Gigabit Ethernet port can be used to carry the peer-keepalive messages. A dedicated VRF is recommended to isolate these control messages from common data packets. When an out-of-band network infrastructure is present, the management interfaces of the Cisco Nexus 7000 supervisor could be also used to carry keep-alive connectivity using the dedicated management VRF. When the vPC peer-link is no longer detected, a dual-active situation occurs, and the system disables all vPC port channel member on the quot;secondaryquot; vPC peer (lower vPC role priority value). Also SVI interfaces associated to a vPC VLAN are suspended on the secondary switch. As a result, in this condition only the “primary” vPC peer actively forwards traffic on the vPC VLANs. Multiple peer-keepalive links can be used to increase resiliency of the dual-active detection mechanism.

Both the Cisco Catalyst 6500 and the Cisco Nexus 7000 offer a variety of high-availability features. Some of the primary features to highlight are In Service Software Upgrade (ISSU), Stateful Switchover (SSO), and Nonstop Forwarding (NSF). The operation and the behavior of these features are unique to the respective platform and can be independently executed without affecting the interoperability between the two platforms.

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series- switches/white_paper_c11_589890.html

Topic 4, Implement High Availability Features on Cisco Unified Fabric Products in a Cisco Data Center Architecture

Question No: 27 – (Topic 4)

Refer to the exhibit.

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Which corrective action is taken to resolve the problem?

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

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

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

  4. Prune all but four VLANs from vPC 199.

  5. Add VLAN 4 to vPC 199.

Answer: C Explanation:

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

Question No: 28 – (Topic 4)

Which topology is not supported when using vPC?

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

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

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

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

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

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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 No: 29 – (Topic 4)

What is the grace period in a graceful restart situation?

  1. how long the supervisor waits for NSF replies

  2. how often graceful restart messages are sent after a switchover

  3. how long NSF-aware neighbors should wait after a graceful restart has started before tearing down adjacencies

  4. how long the NSF-capable switches should wait after detecting that a graceful restart has started, before verifying that adjacencies are still valid

Answer: C Explanation:

Graceful restart (GR) refers to the capability of the control plane to delay advertising the absence of a peer (going through control-plane switchover) for a quot;grace period,quot; and thus help minimize disruption during that time (assuming the standby control plane comes up). GR is based on extensions per routing protocol, which are interoperable across vendors. The downside of the grace period is huge when the peer completely fails and never comes up, because that slows down the overall network convergence, which brings us to the final concept: nonstop routing (NSR).

NSR is an internal (vendor-specific) mechanism to extend the awareness of routing to the standby routing plane so that in case of failover, the newly active routing plane can take charge of the already established sessions.

Reference: http://www.ciscopress.com/articles/article.asp?p=1395746amp;seqNum=2

Question No: 30 – (Topic 4)

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

  1. EPLD and ISSU image upgrades are nondisruptive.

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

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

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

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:

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

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

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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.

If you upgrade EPLD images on an offline module, all of the EPLD images are upgraded.

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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.

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

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The upgrade process disrupts traffic on the targeted module.

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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

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