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

You are deploying a VXLAN using EVPN signaling overlay network. PE1 and PE2 are multihomed to the connected CE device. You notice that the traffic is not load-balancing as expected.

Referring to the exhibit, which two actions will solve this problem? (Choose two.)

Set the route distinguisher on PE2 to 11.11.11.11:100.
Set the LACP system ID on PE2 to 00:00:00:00:00:01.
Set the ESI on both devices to 00:00:00:00:00:00:00:00:00:00.
Set the ESI on PE2 to 00:11:11:11:11:11:11:11:11:11.

Correct answer: BD

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming-overview.htmlReference: https://tgregory.org/2016/06/21/evpn-all-active-multihoming/

Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming-overview.html

Reference: https://tgregory.org/2016/06/21/evpn-all-active-multihoming/

In a preprovisioned mixed Virtual Chassis, which statement is correct about converting a 40Gbps QSFP+ to a Virtual Chassis port in an EX4300?

LLDP is enabled on that interface.
LLDP is disabled on that interface.
One end of the link is configured as a Virtual Chassis port.
Both ends of the link have the default configuration.

Correct answer: D

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/virtual-chassis-qfx-series-cli.html

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

In this scenario. which three hardware capabilities are affected? (Choose three.)

usable VCP connections limited to 10GbE
MAC table size
number of usable ports per member
number of supported routing instances
maximum number of firewall filters

Correct answer: BDE

Explanation:

Reference: http://africa.westcon.com/documents/54080/ex-series-qfx-series-switching-product-comparison-matrix.pdf

You are deploying an EVPN service between your data centers to enable Layer 2 stretch and Virtual Machine Traffic Optimization (VMTO) operations. You want to minimize the recovery time in the event of a failure.

In this scenario, which action must be performed on the IRB interface to accomplish this task?

Configure the same IP address and let the MAC address be dynamically assigned on each PE.
Configure the same IP address and the same MAC address on each PE.
Configure different IP addresses but the same MAC address on each PE.
Configure different IP addresses and different MAC addresses on each PE.

Correct answer: B

Explanation:

Reference: https://www.juniper.net/documentation/en_US/release-independent/solutions/information-products/pathway-pages/solutions/l3gw-vmto-evpn-vxlan-mpls.pdf

What are two methods used to scale an IBGP IP Fabric? (Choose two.)

spanning tree
redundant trunk groups
route reflection
confederations

Correct answer: CD

You are building a mixed-mode Virtual Chassis with two QFX5100-24Qs, four QFX3500-48s, two EX4600-40Fs and two EX4300-48Ts. The Virtual Chassis will not provision.

In this scenario. which statement is correct?

QFX3500s are not allowed in mixed mode.
EX4600s are only allowed with EX4300s.
EX4600s must be preprovisioned as the master and backup.
Mixed-mode Virtual Chassis only allows for eight members.

Correct answer: B

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/virtual-chassis-ex-qfx-series-mixed-understanding.html#jd0e133

Referring to the exhibit, R1 and R2 are QFX5100 Series devices acting as VXLAN Layer 2 Gateways using PIM-SM signaling for the same VXLAN segment (VNI 5100). The multicast group assigned to VNI 5100 is 239.0.0.1. R1 currently has an entry in its MAC table for Host B.

In this scenario. how will R1 react to receiving the Ethernet frame from Host A?

R1 will send a VXLAN encapsulated Ethernet frame using 10.1.1.1 as the destination address.
R1 will send a VXLAN encapsulated Ethernet frame along the source-based multicast tree using 239.0.0.1 as the destination address.
R1 will send a VXLAN encapsulated Ethernet frame using 10.2.2.2 as the destination address.
R1 will send a VXLAN encapsulated Ethernet frame along the RP-based multicast tree using 239.0.0.1 as the destination address.

Correct answer: A

Explanation:

Host A and B are on the same subnet, so communicating at Layer 2 – MAC to MAC. The Layer 3 information is for VXLAN mapping to multicast groups – so the destination address is 239.0.0.1 group, and the tree is source-based (R1 has (10.1.1.1,239.0.0.1) in its multicast table). Assumption here the question infers Host A is sending a frame to Host B. Question poorly worded.

You are deploying 50 QFX5100 switches in your data center. You are asked to explain the benefits of using ZTP during your deployment of these devices.

What is a benefit of this deployment?

You must use DHCP options to provide Junos installation packages to all devices.
You must use DHCP options to provide the transfer mode used for pulling files from a storage server.
You can use DHCP options to push the configuration files to all devices.
You can use DHCP options to indicate which Junos version the switches should be running.

Correct answer: C

Explanation:

Reference:https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/zero-touch-configuring-els.html

Reference:

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/zero-touch-configuring-els.html

You are performing an in-service software upgrade (ISSU) on an QFX5100 Series device.

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

The ksyncd process is used to synchronize the state of the master RE to the new backup RE.
The dcd process is used to validate system configuration requirements.
The vccpd process is used to synchronize the state of the master RE to the new backup RE.
The mgd process is used to validate system configuration requirements.

Correct answer: AD

You are asked to design a deployment plan for a large number of QFX Series switches using zero touch provisioning (ZTP). The ZTP deployment plan must ensure all switches are upgraded to the desired software version.

Which DHCP option are suboption combination would be used to accomplish this task?

DHCP options 66 with a supoption of 00
DHCP options 66 with a supoption of 03
DHCP options 43 with a supoption of 00
DHCP options 43 with a supoption of 03

Correct answer: C

Explanation:

Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/software-image-and-configuration-automatic-provisioning-confguring.html