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Juniper JN0-680 Exam Practice Questions (P. 3)

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Question #11
Your server administrator asks you to preserve the inner VLAN tags of the frames coming from a Layer 2 VXLAN Gateway of the EVPN-enabled segment.
Which two parameters must you add to the configuration to allow the VLAN tag to be passed? (Choose two.)
  1. A
    layer2-protocol-tunneling
  2. B
    decapsulate-accept-inner-vlan
  3. C
    dotlq-tunneling
  4. D
    encapsulate-inner-vlan

Correct Answer:
BD
Reference: https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/encapsulate-inner-vlan.html
Reference: https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/decapsulate-accept-inner-vlan.html

Question #12
Which two statements are correct when performing a unified ISSU? (Choose two.)
  1. A
    The master Routing Engine and backup Routing Engine must be running the same software version before you can perform a unified ISSU.
  2. B
    Unicast RPF-related statistics are not saved across a unified ISSU, and the unicast RPF counters are reset to zero during a unified ISSU.
  3. C
    Unicast RPF-related statistics are saved across a unified ISSU, and the unicast RPF counters are not reset to zero during a unified ISSU.
  4. D
    The backup Routing Engine must be running the most recent software version before you can perform a unified ISSU.

Correct Answer:
AB
Reference:
https://www.juniper.net/documentation/en_US/junos/topics/reference/requirements/issu-system-requirements.html

Question #13

Referring to the exhibit, PE1 and PE2 are acting as MPLS Layer 3 VPN PEs to provide the DCI between DC1 and DC2, which are IP Fabrics. Leaf 1 and Leaf 2 are QFX5100 Series devices acting as VXLAN Layer 2 Gateways using EVPN signaling for the same VXLAN segment.
Which statement is correct about the Edge1 device in this scenario?
  1. A
    Edge1 must be configured for MP-BGP using EVPN signaling.
  2. B
    Edge1 must be configured for MP-BGP using L3VPN signaling.
  3. C
    Edge1 must be configured for BGP labeled unicast on its PE1-facing interface.
  4. D
    Edge1’s routing table must contain an IP route to both Leaf1 and Leaf2.

Correct Answer:
A
Assumption here that the MPLS backbone network offers EVPN; this is the most fully-featured solution. This could also be achieved via C; BGP-LU shared with the provider, basically extending MPLS down to the Edge1+2 routers; this is less risky for the MPLS backbone operator. B and D are ignoring EVPN/VXLAN components and refer to traditional Layer 3 IP routing.
Reference:
https://www.juniper.net/documentation/en_US/junos/topics/concept/evpns-overview.html

Question #14

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.)
  1. A
    Set the route distinguisher on PE2 to 11.11.11.11:100.
  2. B
    Set the LACP system ID on PE2 to 00:00:00:00:00:01.
  3. C
    Set the ESI on both devices to 00:00:00:00:00:00:00:00:00:00.
  4. D
    Set the ESI on PE2 to 00:11:11:11:11:11:11:11:11:11.

Correct Answer:
BD
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/

Question #15
In a preprovisioned mixed Virtual Chassis, which statement is correct about converting a 40Gbps QSFP+ to a Virtual Chassis port in an EX4300?
  1. A
    LLDP is enabled on that interface.
  2. B
    LLDP is disabled on that interface.
  3. C
    One end of the link is configured as a Virtual Chassis port.
  4. D
    Both ends of the link have the default configuration.

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

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