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Juniper JN0-680 Exam Practice Questions (P. 1)

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Question #1
Which EVPN service consists of a single broadcast domain per EVPN instance?
  1. A
    a VLAN bundle service interface
  2. B
    a VLAN-based service interface
  3. C
    a port-based VLAN-aware service interface
  4. D
    a port-based service interface

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

Question #2
You are implementing a Virtual Chassis using QFX5100s and EX4300s in your data center.
In this scenario, which two statements are correct? (Choose two.)
  1. A
    Only 10GbE VCP connections can be used between the QFX5100s and the EX4300s.
  2. B
    The QFX5100 devices cannot assume the line card role in the Virtual Chassis.
  3. C
    Some hardware capabilities are limited by the capabilities of the EX4300 switches.
  4. D
    The EX4300 devices can only assume a line card role in the Virtual Chassis.

Correct Answer:
CD
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)

Question #3
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?
  1. A
    accept-remote-nexthop
  2. B
    advertise-peer-as
  3. C
    add-path
  4. D
    multihop

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

Question #4

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?
  1. A
    approximately 25%
  2. B
    approximately 75%
  3. C
    approximately 33%
  4. D
    approximately 66%

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

Question #5

Referring to the exhibit, which hardware change would be made to the IP Fabric to ensure an exact 4:1 oversubscription ratio?
  1. A
    Upgrade the fabric links to 100GbE.
  2. B
    Add two leaf nodes to the IP Fabric.
  3. C
    Add three leaf nodes to the IP Fabric.
  4. D
    Add a spine node to the IP Fabric.

Correct Answer:
D
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

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