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Juniper JN0-680 Exam Practice Questions (P. 4)

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Question #16
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.)
  1. A
    usable VCP connections limited to 10GbE
  2. B
    MAC table size
  3. C
    number of usable ports per member
  4. D
    number of supported routing instances
  5. E
    maximum number of firewall filters

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

Question #17
You are developing an EVPN service between your data centers to enable Layer 2 stretch and Virtual Machine Traffic Optimization (VMTO) operations.
In this scenario, which action must be performed on the IRB interface to accomplish this task?
  1. A
    Configure the same IP address and let the MAC address be dynamically assigned on each PE.
  2. B
    Configure the same IP address and the same MAC address on each PE.
  3. C
    Configure different IP addresses but the same MAC address on each PE.
  4. D
    Configure different IP addresses and different MAC addresses on each PE.

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

Question #18
What are two methods used to scale an IBGP IP Fabric? (Choose two.)
  1. A
    spanning tree
  2. B
    redundant trunk groups
  3. C
    route reflection
  4. D
    confederations

Correct Answer:
CD

Question #19
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?
  1. A
    QFX3500s are not allowed in mixed mode.
  2. B
    EX4600s are only allowed with EX4300s.
  3. C
    EX4600s must be preprovisioned as the master and backup.
  4. D
    Mixed-mode Virtual Chassis only allows for eight members.

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

Question #20

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?
  1. A
    R1 will send a VXLAN encapsulated Ethernet frame using 10.1.1.1 as the destination address.
  2. B
    R1 will send a VXLAN encapsulated Ethernet frame along the source-based multicast tree using 239.0.0.1 as the destination address.
  3. C
    R1 will send a VXLAN encapsulated Ethernet frame using 10.2.2.2 as the destination address.
  4. D
    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
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.

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