642-997 Latest Exam (Aug 2018)

[Free] 2018(Aug) Dumps4cert Cisco 642-997 Dumps with VCE and PDF Download 41-50

August 26, 2018

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Implementing Cisco Data Center Unified Fabric

Question No: 41 – (Topic 4)

Refer to the exhibit.

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

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

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

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

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

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#39;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 No: 42 – (Topic 4)

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Customer has configured fabricpath allocate-delay to 600. What is the effect of this?

  1. The allocate-delay is the time for FP to go into forwarding state

  2. It specifies the time delay for a transitioned value to be propagated throughout the network

  3. It specifies the time delay for a link bringup to detect conflicts

  4. The allocate-delay is the time delay for a new resource to be propagated throughout the network

Answer: D Explanation:

Specifies the time delay for a new resource to be propagated throughout the network. Reference: http://www.cisco.com/web/techdoc/dc/reference/cli/nxos/commands/fpath/fabricpath_timers


Topic 5, Implement Cisco Unified Fabric Network Features and Functionality in a Cisco Data Center Environment

Question No: 43 – (Topic 5)

What must be enabled on the interface of a multicast-enabled device to support the Source Specific Multicast feature?

  1. IGMP version 3

  2. IGMP version 2

  3. IGMP version 1

  4. PIM

Answer: A Explanation:

IGMP is the Internet Engineering Task Force (IETF) standards track protocol used for hosts to signal multicast group membership to routers. Version 3 of this protocol supports source filtering, which is required for SSM. To run SSM with IGMPv3, SSM must be supported in the Cisco IOS router, the host where the application is running, and the application itself.

IGMP v3lite and URD are two Cisco-developed transition solutions that enable the immediate development and deployment of SSM services, without the need to wait for the availability of full IGMPv3 support in host operating systems and SSM receiver applications. IGMP v3lite is a solution for application developers that allows immediate development of SSM receiver applications switching to IGMPv3 as soon as it becomes

available. URD is a solution for content providers and content aggregators that enables them to deploy receiver applications that are not yet SSM enabled (through support for IGMPv3). IGMPv3, IGMP v3lite, and URD interoperate with each other, so that both IGMP v3lite and URD can easily be used as transitional solutions toward full IGMPv3 support in hosts.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfssm.html

Question No: 44 – (Topic 5)

Refer to the exhibit.

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Which statement based on these two outputs that were collected 24 hours apart is true?

  1. The Site 2 OTV edge device has gone down.

  2. The MAC address cannot be discovered on two separate port channel interfaces.

  3. The MAC address that ends in 020a moved to the local site 23 hours ago.

  4. The Overlay1 IP address should be a multicast IP address.

Answer: C

Question No: 45 DRAG DROP – (Topic 5)

Drag the security description on the left to the appropriate security feature on the right.

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Question No: 46 – (Topic 5)

Which two issues explain why a packet is not being routed as desired in a policy-based routing configuration? (Choose two.)

  1. The route map is not applied to the egress interface.

  2. The route map is not applied to the ingress interface.

  3. The next hop that is configured in the route map is not in the global routing table.

  4. The next hop that is configured in the route map has a higher metric than the default

next hop.

Answer: C,D Explanation:

The next hop that is configured in the route map is not in the global routing table then the packet will not be forwarded as desired. The next hop that is configured in the route map has a higher metric than the default next hop.

Question No: 47 – (Topic 5)

Which two statements about implementing Cisco NPV and NPIV on a Cisco Nexus 5000 Series switch are true? (Choose two.)

  1. STP must run inside the FP network.

  2. All VLANs must be in the same mode, CE, or FP.

  3. FP port can join the private and nonprivate VLANs.

  4. Only F and M series modules can run FabricPath.

  5. These require an enhanced Layer 2 license to run.

Answer: B,E Explanation:

With the Nexus 5×00 switch, FCoE functionality is a licensed feature. After the license is installed, FCoE configuration can be completed.

Reference: http://www.ciscopress.com/articles/article.asp?p=2030048amp;seqNum=4

Question No: 48 – (Topic 5)

Which statement about scalability in Cisco OTV is true?

  1. The control plane avoids flooding by exchanging MAC reachability.

  2. IP-based functionality provides Layer 3 extension over any transport.

  3. Any encapsulation overhead is avoided by using IS-IS.

  4. Unknown unicasts are handled by the authoritative edge device.

Answer: A Explanation:

Cisco calls the underlying concept of OTV traffic forwarding quot;MAC routingquot;, since it behaves as if you are routing Ethernet frames over the DCI transport. OTV uses a control plane protocol to proactively propagate MAC address reachability before traffic is allowed to pass, which eliminates dependency on flooding mechanism to either learn MAC addresses or forward unknown unicasts.

Reference: http://www.computerworld.com/article/2515468/data-center/layer-2-data-center- interconnect-options.html

Question No: 49 – (Topic 5)

Refer to the exhibit.

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This multilayer Cisco Nexus switch had been the active virtual gateway for Group 1 before it became temporarily unavailable. What will happen to GLBP Group 1 when this device becomes available again?

  1. The currently active router remains active.

  2. It depends on the priority value that is configured active on the router.

  3. The Cisco Nexus switch becomes the active virtual gateway after 600 seconds.

  4. It depends on the weighting values that are configured active on the router.

Answer: A Explanation:

GLBP prioritizes gateways to elect an active virtual gateway (AVG). If multiple gateways have the same priority, the gateway with the highest real IP address becomes the AVG. The AVG assigns a virtual MAC address to each member of the GLBP group. Each member is the active virtual forwarder (AVF) for its assigned virtual MAC address, forwarding packets sent to its assigned virtual MAC address.

The AVG also answers Address Resolution Protocol (ARP) requests for the virtual IP address. Load sharing is achieved when the AVG replies to the ARP requests with different virtual MAC addresses.

Note: Packets received on a routed port destined for the GLBP virtual IP address terminate on the local router, regardless of whether that router is the active GLBP router or a redundant GLBP router. This termination includes ping and Telnet traffic. Packets received on a Layer 2 (VLAN) interface destined for the GLBP virtual IP address terminate on the active router.

Question No: 50 – (Topic 5)

What is the Overlay Transport Virtualization site VLAN used for?

  1. to allow the join interfaces at different sites to communicate

  2. to detect devices at the site that are not capable of OTV

  3. to allow multiple site AEDs to communicate with each other

  4. to detect other OTV edge devices in the site

Answer: D Explanation:

The edge device performs OTV functions: it receives the Layer 2 traffic for all VLANs that need to be extended to remote locations and dynamically encapsulates the Ethernet frames into IP packets that are then sent across the transport infrastructure. It is expected that at least two OTV edge devices are deployed at each data center site to improve the resiliency.

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DC I3_OTV_Intro/DCI_1.html

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