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642-997 Latest Exam (Nov 2017)

[Free] 2017(Nov) Dumps4cert Pass4sure Cisco 642-997 Dumps with VCE and PDF 31-40

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: 31 – (Topic 4)

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Dumps4Cert 2017 PDF and VCE

Dumps4Cert 2017 PDF and VCE

Dumps4Cert 2017 PDF and VCE

On a Cisco Nexus7000 switches what is true regarding Cisco FabricPath requirements?

  1. Ensure that you have installed the Enhanced Layer 2 license and that you have installed an F Series module

  2. Ensure that you have installed the Enhanced Layer 2 license and that you have installed an M Series module

  3. Ensure that you have installed the Enhanced Layer 3 license and that you have installed an M Series module

  4. Ensure that you have installed the Scalable Feature License license and that you have installed an F Series module

Answer: A Explanation:

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FabricPath switching has the following prerequisites:

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You should have a working knowledge of Classical Ethernet Layer 2 functioning.

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Dumps4Cert 2017 PDF and VCE

You must install the FabricPath feature set on the default and nondefault VDC before you enable FabricPath on the switch. See Configuring Feature Set for FabricPath for information on installing the FabricPath feature set.

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You are logged onto the device.

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Ensure that you have installed the Enhanced Layer 2 license.

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You are in the correct virtual device context (VDC). A VDC is a logical representation of a set of system resources. You can use the switchto vdc command with a VDC number.

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You are working on the F Series module.

Reference: http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx- os/fabricpath/c:o3n2figur(atiopnic/g4u)ide/fp_switching.html

Question No: 32 – (Topic 4)

Which SCSI terminology is used to describe source and destination nodes?

  1. hosts and targets

  2. initiators and targets

Answer: B Explanation:

In computer data storage, a SCSI initiator is the endpoint that initiates a SCSI session, that is, sends a SCSI command. The initiator usually does not provide any Logical Unit Numbers (LUNs).

On the other hand, a SCSI target is the endpoint that does not initiate sessions, but instead waits for initiators#39; commands and provides required input/output data transfers. The target usually provides to the initiators one or more LUNs, because otherwise no read or write command would be possible.

Reference: http://en.wikipedia.org/wiki/SCSI_initiator_and_target

Question No: 33 – (Topic 4)

In policy-based routing, which action is taken for packets that do not match any of the route-map statements?

  1. forwarded after the egress queue empties on the outbound interface

  2. forwarded using the last statement in the route map

  3. forwarded using the closest matching route-map statement

  4. forwarded using destination-based routing

Answer: D Explanation:

Each entry in a route map contains a combination of match and set statements. The match statements define the criteria for whether appropriate packets meet the particular policy (that is, the conditions to be met). The set clauses explain how the packets should be routed once they have met the match criteria.

You can mark the route-map statements as permit or deny. You can interpret the statements as follows:

  • If the statement is marked as permit and the packets meet the match criteria, the set clause is applied. One of these actions involves choosing the next hop.

  • If a statement is marked as deny, the packets that meet the match criteria are sent back through the normal forwarding channels, and destination-based routing is performed.

  • If the statement is marked as permit and the packets do not match any route-map statements, the packets are sent back through the normal forwarding channels, and destination-based routing is performed.

    Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7- x/unicast/configuration/guide/l3_cli_nxos/l3pbr.pdf

    Question No: 34 – (Topic 4)

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    Dumps4Cert 2017 PDF and VCE

    Dumps4Cert 2017 PDF and VCE

    Dumps4Cert 2017 PDF and VCE

    FabricPath switch-id is 25 and load-balance is configured for L3/L4 and rotate amount is 14 byte. What information is true about FabricPath switch-id?

    1. FabricPath topology requires manual configuration of switch-id which has a range from 1 to 4095

    2. Every FabricPath must have a manually configured switch-id for it to form a FabricPath topology

    3. FabricPath topology requires manual configuration of switch-id which has a range from 1 to 4099

    4. You do not have to manually assign a switch ID unless you are running a virtual port channel plus (vPC ) because the system assigns a switch ID for you when you enable FabricPath

    Answer: D Explanation:

    fabricpath switch-id (vPC)

    To configure a virtual port channel plus (vPC ) switch ID, use the fabricpath switch-id command. To remove the FabricPath switch from a vPC domain, use the no form of this command.

    fabricpath switch-id switch-id

    no fabricpath switch-id [ switch-id ]

    Usage Guidelines

    You do not have to manually assign a switch ID (unless you are running a vPC ); the system assigns a switch ID for you when you enable FabricPath.

    Note You must assign the same vPC switch ID to each of the two vPC peer devices before they can form an adjacency.

    This command requires an Enhanced Layer 2 license.

    Examples

    This example shows how to configure a vPC switch ID on a FabricPath-enabled device: switch# configure terminal

    switch(config)# vpc domain 1

    switch(config-vpc-domain)# fabricpath switch-id 1

    Configuring fabricpath switch id will flap vPCs. Continue (yes/no)? [no]

    Question No: 35 – (Topic 4)

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

    1. multicast data traffic

    2. unicast data traffic

    3. broadcast data traffic

    4. vPC keep-alive messages

    Answer: A,C 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 No: 36 – (Topic 4)

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    Dumps4Cert 2017 PDF and VCE

    Dumps4Cert 2017 PDF and VCE

    Dumps4Cert 2017 PDF and VCE

    What is effect of the command “fabricpath load-balance unicast Iayer3”?

    1. It configures F2 VDC FabricPath unicast load balancing

    2. The command automatically load balances broadcast traffic

    3. It configures F1/MI VDC FabricPath unicast load balancing

    4. It configures M1 VDC FabricPath unicast load balancing

    Answer: C Explanation:

    The F1 cards are complemented by M1 card for routing purposes. When using M1 cards in the same virtual device context (VDC) as the F1 card, routing is offloaded to the M1 cards, and more routing capacity is added to the F1 card by putting more M1 ports into the same VDC as the F1 card.

    Question No: 37 – (Topic 4)

    Which statement about Cisco FabricPath is true?

    1. It is the best solution for interconnecting multiple data centers.

    2. It optimizes STP throughout the Layer 2 network.

    3. It is a simplified extension of Layer 3 networks across a single data center.

    4. The Cisco FabricPath domain appears as a single STP bridge, where each edge port uses the same MAC address.

    Answer: D Explanation:

    To have a loop-free topology for the CE/FabricPath hybrid network, the FabricPath network automatically displays as a single bridge to all connected CE devices. The STP domains do not cross into the FabricPath network. If multiple STP domains are defined, BPDUs and topology change notifications (TCNs) are localized to the domain. If a connected STP domain is multihomed to the FabricPath domain, a TCN must be able to reach to all devices in the STP domain through the FabricPath domain. As a result, the TCN is sent to the FabricPath domain through the IS-IS protocol data unit (PDU) by default.

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

    _n1_1/n5k_ops_fabricpath.html

    Question No: 38 – (Topic 4)

    Refer to the exhibit.

    Dumps4Cert 2017 PDF and VCE

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

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

    2. Switches with FabricPath and vPC consume two switch IDs.

    3. Emulated switch IDs must be numbered from 1 to 99.

    4. Each switch ID must be unique in the FabricPath topology.

    5. Switch IDs must be configured manually.

    Answer: B,D,E 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 No: 39 – (Topic 4)

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

    1. Perform a rapid route convergence.

    2. Initialize a standby supervisor transparently when one is present.

    3. Remain in the data forwarding path through a process restart.

    4. Maintain a management connection throughout a router restart.

    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 quot;gracequot; 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 No: 40 – (Topic 4)

    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?

    1. 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.

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

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

    4. 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.

    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:

    Dumps4Cert 2017 PDF and VCE

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    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 to 3600 seconds.

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    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_v pc_ops.html

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