JN0-680: Data Center, Professional - Free download from ExamHUB

Which EVPN service consists of a single broadcast domain per EVPN instance?

a VLAN bundle service interface
a VLAN-based service interface
a port-based VLAN-aware service interface
a port-based service interface

Correct answer: B

Explanation:

Reference: https://tools.ietf.org/html/draft-ietf-l2vpn-evpn-08#section-6.1

You are implementing a Virtual Chassis using QFX5100s and EX4300s in your data center.

In this scenario, which two statements are correct? (Choose two.)

Only 10GbE VCP connections can be used between the QFX5100s and the EX4300s.
The QFX5100 devices cannot assume the line card role in the Virtual Chassis.
Some hardware capabilities are limited by the capabilities of the EX4300 switches.
The EX4300 devices can only assume a line card role in the Virtual Chassis.

Correct answer: CD

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/virtual-chassis-ex-qfx-series-mixed-understanding.html (EX4300s are only line cards, QFX5100 can be line card).Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/virtual-chassis-ex4300-virtual-chassis-understanding.html (Supports 40GE VCPs)

Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/virtual-chassis-ex-qfx-series-mixed-understanding.html (EX4300s are only line cards, QFX5100 can be line card).

Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/virtual-chassis-ex4300-virtual-chassis-understanding.html (Supports 40GE VCPs)

A customer notices that all traffic is traveling over a single link within their partially meshed IP Fabric using IBGP. While troubleshooting, the customer notices that the configuration is missing a configuration parameter.

Which parameter would the customer use to solve this problem?

accept-remote-nexthop
advertise-peer-as
add-path
multihop

Correct answer: C

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/add-path-edit-protocols-bgp.html

A customer has a 3-stage Clos architecture with three spine devices as shown in the exhibit.

If a single spine device fails, what percentage of the remaining bandwidth will be available from leaf node to leaf node?

approximately 25%
approximately 75%
approximately 33%
approximately 66%

Correct answer: D

Explanation:

Leaf-to-leaf communication has 3 paths via each Spine node; lose 1 Spine, lose 1 path, i.e. 33%

Referring to the exhibit, which hardware change would be made to the IP Fabric to ensure an exact 4:1 oversubscription ratio?

Upgrade the fabric links to 100GbE.
Add two leaf nodes to the IP Fabric.
Add three leaf nodes to the IP Fabric.
Add a spine node to the IP Fabric.

Correct answer: D

Explanation:

Leaf = 480 Gbps southbound, 80 Gbps northbound; 480/80 = 6:1Add a spine and northbound capacity is 120 Gbps; 480/120 = 4:1Reference: http://www.brocade.com/content/html/en/solution-design-guide/brocade-dc-fabric-architectures-sdg/GUID-A0E2AF7F-C47A-458D-989A-35EC97E262DD.html

Leaf = 480 Gbps southbound, 80 Gbps northbound; 480/80 = 6:1

Add a spine and northbound capacity is 120 Gbps; 480/120 = 4:1

Reference: http://www.brocade.com/content/html/en/solution-design-guide/brocade-dc-fabric-architectures-sdg/GUID-A0E2AF7F-C47A-458D-989A-35EC97E262DD.html

A customer has built a VXLAN using an EVPN signaling infrastructure with remote facilities with VXLAN using EVPN signaling connected to the Internet. The customer notices that the network is completely stable with no protocol errors in the underlay or overlay. The customer, however, cannot pass any application data across the network.

Which statement would explain the intermittent loss?

There is an LACP key mismatch.
The MTU is exceeded.
The routing protocol authentication has failed.
The BPDU protection is invoked.

Correct answer: D

You have deployed a multicast server attached to a QFX5100 Series device serving as a VTEP.

Which two statements are correct in this scenario? (Choose two.)

By default, the QFX5100 will send copies of the multicast packets to all locally attached devices in the same VLAN.
By default, the QFX5100 will send copies of the multicast packets to locally attached devices in the same VLAN that are interested receivers only.
By default, the QFX5100 will encapsulate the multicast packets in VXLAN and forward them to all remotely connected VTEPs.
By default, the QFX5100 will encapsulate the multicast packets in VXLAN and forward them to remotely connected VTEPs with interested receives only.

Correct answer: AC

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/sdn-vxlan.html#jd0e168

Which protocol is used between VCF member devices to create a loop-free topology?

LLDP
MSTP
RSTP
VCCP

Correct answer: D

Explanation:

Reference: http://www.juniper.net/documentation/en_US/release-independent/vcf/information-products/pathway-pages/vcf-best-practices-guide.pdf

Referring to the exhibit, each leaf node is a QFX5100 acting as a VXLAN Layer 2 Gateway using EVPN signaling. Leaf 2 and Leaf 3 are both attached to the same EVPN Ethernet segment. Leaf 2 has been elected the designated forwarder for VLAN 200 on that Ethernet segment.

In this scenario, which two actions will Leaf 1 perform with the broadcast Ethernet frame received from Host A? (Choose two.)

Leaf 1 will strip the VLAN tag from the Ethernet frame before encapsulating it in VXLAN.
Leaf 1 will send a VXLAN encapsulated copy of the Ethernet frame to both Leaf 2 and Leaf 3.
Leaf 1 will change the VLAN tag of the Ethernet frame to 200 before encapsulating it in VXLAN.
Leaf 1 will send a VXLAN encapsulated copy of the Ethernet frame to Leaf 2 only.

Correct answer: A

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/sdn-vxlan.html

You have built a mixed-mode VCF consisting of two QFX5100-24Qs as spines, two QFX5100-48S as leaf nodes, and one EX4300 as a leaf node. The VCF is working for all devices, except the EX4300 40GbE fabric links will not join the VCF.

In this scenario, what must be corrected to solve the connectivity problem?

Reboot all of the VCF members.
Power off all of the VCF members and power up the spines before powering up the leafs.
Zeroize the EX4300, clear all the tables with the clear ethernet-switching tables command on all members, and reissue the request virtual-chassis mixed-mode command.
Turn off autonegotiation on the EX4300 and the attached spine interfaces, and then use the request virtual-chassis vc-port set command on the spine ports connected to the EX4300.

Correct answer: A

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/vcf-adding-device.html(Required only if you are adding a device that turns a non-mixed VCF into a mixed VCF) Log in to the VCF and set all devices in the VCF to mixed mode. Configure all devices to reboot to complete this procedure. user@device> request virtual-chassis mode mixed all-members reboot The VCF experiences downtime as part of the reboot step.

Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/vcf-adding-device.html

(Required only if you are adding a device that turns a non-mixed VCF into a mixed VCF) Log in to the VCF and set all devices in the VCF to mixed mode. Configure all devices to reboot to complete this procedure.

user@device> request virtual-chassis mode mixed all-members reboot

The VCF experiences downtime as part of the reboot step.

Vendor:	Juniper
Exam Code:	JN0-680
Exam Name:	Data Center, Professional
Date:	Feb 27, 2019
File Size:	7 MB

Download Data Center, Professional.JN0-680.TestInside.2019-02-27.65q.vcex

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