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642-997 PDF DEMO:

QUESTION NO: 1
Which management feature provides these functions?
* Direct paging of network support engineers
* Email notifications to a network operations center
* Direct Service Request generation with the Cisco TAC
A. scripting along with the scheduler feature
B. RSA
C. Call Home
D. SNMP traps
Answer: C

QUESTION NO: 2
What is the Overlay Transport Virtualization site VLAN used for?
A. to allow the join interfaces at different sites to communicate
B. to detect devices at the site that are not capable of OTV
C. to allow multiple site AEDs to communicate with each other
D. to detect other OTV edge devices in the site
Answer: D

QUESTION NO: 3
Which statement about the Layer 3 card on the Cisco Nexus 5500 Series Switch is true?
A. BGP support is not provided, but RIP, EIGRP, and OSPF support is provided.
B. Up to two 4-port cards are supported with up to 160 Gb/s of Layer 3 forwarding capability.
C. Up to 16 FEX connections are supported.
D. Port channels cannot be configured as Layer 3 interfaces.
Answer: C
Explanation:
From the Cisco NX-OS 5.1(3)N1(1) release and later releases, each Cisco Nexus 5500 Series device can manage and support up to 24 FEXs without Layer 3.
With Layer 3, the number of FEXs supported per Cisco Nexus 5500 Series device is 8. With Enhanced vPC and a dual-homed FEX topology each FEX is managed by both Cisco Nexus 5000 Series devices.
As a result, one pair of Cisco Nexus 5500 Series devices can support up to 24 FEXs and 16 FEXs for
Layer 2 and Layer 3.
Reference:
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/mkt_ops_guides/513_n1_1/ n5k_enhanced_vpc.html

QUESTION NO: 4
Which two functions are enabled when you set up vPC+ at the FabricPath edge? (Choose two.)
A. the ability to attach Cisco Fabric Extenders in FEX active/active mode
B. the ability to stop all Layer 3 egress traffic
C. the ability to attach servers to edge switches with port-channel teaming
D. the ability to attach additional Classic Ethernet switches in vPC+ mode
Answer: A,C

QUESTION NO: 5
Refer to the exhibit.
What is the consequence of configuring peer-gateway on the two vPC peers N7K-1 and N7K-2?
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.
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

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Updated: May 28, 2022